FT4X

MODEL
Fox Thermal Gas Mass Flow Meter

Instruction Manual
Document #106796
Rev H

831.384.4300 | 399 Reservation Rd, Marina, CA 93933 | foxthermal.com

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 Model FT4X
Disclaimer

This publication must be read in its entirety before performing any operation. Failure to
understand and follow these instructions could result in serious personal injury and/or
damage to the equipment. Should this equipment require repair or adjustment beyond
the procedures given herein, contact the factory at:

FOX THERMAL INSTRUMENTS, INC.

399 RESERVATION ROAD
MARINA, CA 93933
TELEPHONE: 831-384-4300
EMAIL: SERVICE@FOXTHERMAL.COM

Download Technical Data Sheets from our website:

www.foxthermal.com

Fox Thermal Instruments, Inc. (Fox Thermal) believes that the information
provided herein is accurate; however, be advised that the information contained
herein is NOT a guarantee for satisfactory results. Specifically, this information is
neither a warranty nor guarantee, expressed or implied, regarding performance,
merchantability, fitness, or any other matter with respect to the products; nor
recommendation for the use of the product/process information in conflict with
any patent. Please note that Fox Thermal reserves the right to change and/or
improve the product design and specification without notice.

Fox Thermal FT4X Manuals:

• Fox Thermal FT4X View™ Manual

All Fox Thermal Manuals and software available in English only.

| 3
Model FT4X
Table of Contents

1. Introduction Page 6

a. Quick Start Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 6

b. Menu Trees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 8

c. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 17

2. Installation (Mechanical) Page 20

a. Lateral Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 21

b. Welding Branch Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 23

c. Installation Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 24

d. Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 27

e. Mounting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 25

f. Retractor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 29

3. Wiring (Electrical) Page 33

a. Wiring Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 33

b. Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 36

c. Signal Wiring and HART Communication Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 38

d. Pulse/Alarm Wiring (optional feature) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 40

e. RS485 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 43

f. HART Handheld Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 44

g. Remote Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 45

4. Operation (Standard Operation) Page 48

a. Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 48

b. Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 50

c. CAL-V™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 69

d. Gas-SelectX® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 72

e. Data Logger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 76

5. Communication Protocols Page 82

a. Modbus RTU (RS485) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 82

b. HART Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 95

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 Model FT4X
Table of Contents

6. Maintenance Page 99

a. Safe Removal of Meter from Retractor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 100

b. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 104

7. Appendices Page 110

a. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 110

b. Agency Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 113

c. Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 114

d. Terms and Conditions of Sale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 125

e. Returning your meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 126

8. Definitions Page 128

9. Index Page 129

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Model FT4X
Quick Start Guide

Use the table below as a guide while using the worksheet on the next page to record your notes.
NOTE! Please read the entire quick-start procedure before beginning installation.

1. Record inside diameter (ID). Ensure the actual pipe ID

matches the pipe ID shown on the factory calibration ID
OUTER
certificate. If IDs do not match, refer to "Pipe DIAMETER
Diameter" on page 64.
2. PIPE ID MIN.
Record up/downstream straight-pipe requirements
based on Pipe ID and meter style (insertion or inline). FLOW
[refer to p. 21] 8X = INLINE 4X = INLINE
15X = INSERTION 10X = INSERTION

3. The Flow Direction Indicator must point in the FLOW

direction of flow. INDICATOR:
The housing can be rotated for a better view of the - POINT IN DIRECTION
OF FLOW
meter's display. Note that the 2 set screws must be - LOOSEN SET SCREWS TO
loosened before the housing will turn. [refer to p. ROTATE HOUSING ±90º, ±180º
27] - TIGHTEN SET SCREWS
WHEN DONE
4. PIPE

Ensure correct probe depth setting. If using 1 ½" size

pipe, please see note on p. 24. CL FLOW 0.73"
(18.5 mm)
5. Open the housing. If needed, the orientation of ACCESS THE
DISPLAY BY
display can be rotated in 90° increments for a better UNSCREWING
REMOVE SCREWS
ON DISPLAY TO
view. COVER F1 F2 F3 F4

ROTATE DISPLAY
[refer to p. 28 for more information] ±180° EARTH GROUND

6. TS2 F1 0.75A
1 SWITCH INPUT (+) TS1

Ensure power wiring [p. 36] is properly connected. 2 SWITCH INPUT (-) POWER (+) 1
POWER
[refer to Wiring section p. 33 for more information]
3 PULSE (+) POWER (-) 2
TP1
4 PULSE (-) 4-20mA #1 (+) 3
TP2
CUSTOMER PLC OR DCS FT4X
5 Tx/Rx (+)
4-20mA #1 (-) 4
6 Tx/Rx (-) 4-20mA #2 (+) 5
+12 to4-20mA
24VDC

7.
7 COMMON #2 (-) 6

Verify you have the proper signal wiring and serial

W1
TERMINATION
2.4K Ohm typical with 24VDC Power

communication wiring (if that option is ordered) 1.2K Ohm typicalJ1with 12VDC Power
USB
TS2
1 SWITCH INPUT (+) TS1
F1 0.75A

[refer to p. 38 - p. 44 for more information]

+ 2 SWITCH INPUT (-) POWER (+) 1
- 3 PULSE (+)
Pulse or Alarm Output
POWER (-) 2
TP1
4 PULSE (-)
Electronics Enclosure 4-20mA #1 (+) 3 Remote Enclosure
5 Tx/Rx (+) TP2
4-20mA #1 (-) 4

12 to 24VDC Return
6 Tx/Rx (-) 4-20mA #2 (+) 5
7 COMMON 4-20mA #2 (-) 6

8.
W1
TERMINATION

Ensure remote wiring is correct if remote option J1

USB

ordered.
[refer to p. 45 - p. 47 for more information]

9. Cable Shield

Apply power to the flow meter. Initializing...

F1 F2 F3 F4

10. Check the remaining flow meter settings by accessing the meter settings either through the front panel
of the display or by using the FT4X View™ software tool. Record the settings in the spaces given for
SENSOR

items A - F on the following page.

Quick Start Guide | 6

 Model FT4X
Quick Start Guide

Before applying power to your meter, use this worksheet to record your notes.

Serial Number: Serial Number: Serial Number: Serial Number:

Item to verify
1. What is the Pipe ID? ID = ID = ID = ID =

2. Calculate the Upstream/ UP = UP = UP = UP =

Downstream straight-pipe DN = DN = DN = DN =
requirements
3. Is the flow indicator pointed in Y/N Y/N Y/N Y/N
direction of flow?
Must the housing be rotated for Y/N Y/N Y/N Y/N
easy viewing?
4. Is the probe depth setting correct? Y/N Y/N Y/N Y/N

5. Have you rotated the display for Y/N Y/N Y/N Y/N
easier viewing?
6. Verify proper power wiring

7. Verify proper remote wiring (if

ordered)
8. Verify proper input/output wiring

After applying power to your meter, check items A - F below by accessing the meter settings either through
the front panel of the meter's display or by using the FT4X View™ software tool.
A. Which flow units have been set in
meter? (SCFM, KG/H, etc..)
B. Correct values for reference Y/N Y/N Y/N Y/N
temperature and pressure?
C. Confirm the pipe ID listed above
same as "Pipe_id="
D. Verify the 1st 4mA and 20mA 4mA = 4mA = 4mA = 4mA =
meter settings 20mA = 20mA = 20mA = 20mA =
E. Verify the 2nd 4mA and 20mA 4mA = 4mA = 4mA = 4mA =
meter settings 20mA = 20mA = 20mA = 20mA =
F. Confirm the correct gas is selected
for your application in the Gas-
SelectX® menu
Your Notes:

If you are experiencing any problems after completing this procedure, please call the Fox
Thermal Service Department at 831-384-4300 to review this information.

Quick Start Guide | 7

Model FT4X
Introduction

Fig. 1.1: FT4X Menu Tree - Main Menu

Enter menu by scolling to display 4

and entering the password

MAIN MENU
I/O FLO DSP EXIT

Display Menu, p. 12
Flow Menu 1, p. 10

I/O MENU
I/O COM 420 EXIT
Digital Output
Menu, p. 9

SET 4‐20 mA
Analog Outputs
Communication CH1 CH2 EXIT

None Comm=Modbus Temp mA=Temp

Modbus Flow NXT OK
NXT OK
HART

20 mACnt=52921 20 mACnt=52921
1200 Baud=9600 CHG OK CHG OK
2400
NXT OK Level 2 Level 2
4800 password password
9600
19200
38400 4 mACnt=2515 4 mACnt=2515
57600 CHG OK CHG OK
76800
115200
Modbus
NONE Parity=NONE Only
ODD 20 mA=2345.6 SCFM 20 mA=200°F
NXT OK CHG OK
EVEN CHG OK

01‐247 Address=02 4 mA=10°F

4 mA=0 SCFM
CHG OK CHG OK
CHG OK

Not use Not use

3.6 mA mA Fault=Not use 3.6 mA mA Fault=Not use
21 mA NXT OK 21 mA NXT OK

Comm=Hart
OK
HART NOTE! Some menus will only be available with a
Only level 2 password.
0‐63 Address=0
CHG OK
NOTE! Menu tree boxes are populated with
example values.

Introduction | 8
 Model FT4X
Introduction

Fig. 1.2: FT4X Menu Tree - Digital Outputs and Input

MAIN MENU
I/O FLO DSP EXIT

I/O MENU
I/O COM 420 EXIT

Set I/O
OUT INP EXIT

Not used OUT= Pulse Not used Inp= Not Used

Pulse Tot Reset
NXT OK NXT OK
HiFloAlm
LoFloAlm
HiTempAlm
LoTempAlm
Alarm output System Alm Pulse

Select 1 of 3
High Flow Alarm methods to scale
the pulse output

OUT= HiFloAlm PULSE OUTPUT

NXT OK P/U U/P FEQ EXIT

HiFloAlm=500 SCFM
CHG OK PLS/UNT=2 UNT/PLS=0.5 MaxFreq=100Hz
CHG OK CHG OK CHG OK
Low Flow Alarm

OUT= LoFloAlm MaxFlo=5000 SCFM

NXT OK CHG OK

LoFloAlm=100 SCFM
CHG OK

High Temp Alarm

OUT= HiTempAlm
NXT OK
(See Flow Menu 2, p. 11, for more alarm
settings)
HiTmpAlm=250° F
CHG OK

Low Temp Alarm

OUT= LoTempAlm
NXT OK

LoTmpAlm=10 F
CHG OK
NOTE! A value of 0 disables the
alarms
System Alarm

OUT= System Alarm

NXT OK

Introduction | 9
Model FT4X
Introduction

Fig. 1.3: FT4X Menu Tree - Flow Menu 1

MAIN MENU
I/O FLO DSP EXIT

FLOW MENU 1
DGN UNT FM2 EXIT

Flow Menu 2 Menu, p. 11

DIAGNOSTIC SCFM FLO UNT=SCFM

SCFH
SIM CAL‐V EXIT NM3/H
NXT OK
NM3/M
KG/H
KG/M
KG/S
Deg F TMP UNT=° F
LBS/H
Simulate Flow? LBS/M
Deg C NXT OK
YES NO LBS/S
NLPH
NLPM
MMSCFD
LBS/D TmpRef=60 °F
FloSim=0 SCFM SLPM CHG OK
CHG OK NLPS
MSCFD
SM3/H
MT/H
NM3/D mmHG PRES UNT=Psia
Simulate Temp? MMSCFM Psia NXT OK
SCFD bara
YES NO MCFD
SM3/M
SM3/D
PresRef=14.73
TmpSim=0 ° F CHG OK
CHG OK

ENABLE SIM?
YES NO

CAL-V™ Menu, p. 13

Introduction | 10
 Model FT4X
Introduction

Fig. 1.4: FT4X Menu Tree - Flow Menu 2

MAIN MENU
I/O FLO DSP EXIT

FLOW MENU 1
DGN UNT FM2 EXIT

FLOW MENU 2
GAS SPC PRM EXIT

Parameters

Level 2

K fact = 0% Cutoff=12.5 SCFM Flow cutoff in selected units

CHG OK CHG OK

Gas-SelectX® Menu, p. 14 RESTORE DATABASE? Pipe_id=4.026 In Pipe id in inches or mm

YES NO CHG OK

RESET CRC? Filter=0.8 Sec Flow Filter in seconds

YES NO CHG OK Min = 0.8, max = 10

HiFloAlm=0 SCFM
CHG OK

 These alarms can be used without the digital output assigned to

the alarm. LoFloAlm=0 SCFM
CHG OK
 If that is the case, the alarm status will only be shown on the
display, through serial communication or FT4X View.
 If the digital output is assigned to an alarm, changing the value
HiTmpAlm=0°F
here will change that setting.
CHG OK
 A value of 0 disables the alarm.

LoTmpAlm=0°F
CHG OK

Introduction | 11
Model FT4X
Introduction

Fig. 1.5: FT4X Menu Tree - Display Menu

MAIN MENU
I/O FLO DSP EXIT

DISP/TIME/PSW
DSP LOG PSW EXIT

Display 1
Line 1

FLo rate On
DSP1L1=FLo rate 24 Hour log=On PASSWD=1234
Total Off
Elps NXT OK NXT OK CHG OK
Display 1 Temp
Line 2 Alarm

Date/Time Review
NXT
FLo rate
Total
DSP1L2=Total
Elps NXT OK
Display 2 Temp 10/12/17 10:33
Line 1 Alarm CHG OK

FLo rate
DSP2L1=Temp Contract time for
Total Year Set=17 Contr time=12:59
Elps NXT OK 24 hour total
Display 2 CHG OK CHG OK
Temp
Line 2 Alarm

Month Set=10
CHG OK
Contr Hour=12
FLo rate
Total
DSP2L2=Elps CHG OK
Elps NXT OK Day Set=12
When alternate Temp
CHG OK
Alarm Contr Min=59
"ON", flashes
between the 2 CHG OK
displays Hour Set=12
On CHG OK
Off
ALTERNATE=Off Set Contr Time?
NXT OK YES NO
Min Set=51
CHG OK

Sec Set=0
CHG OK

Set Date/Time?
YES NO

NOTE! All readings updated every second

• Flo Rate = Flow rate of process gas
• Total = Total flow of process gas
• Elps = Elapsed time since reset of flow total
• Temp = Temperature of process gas
• Alarm = Notification of errors; diagnostic errors

Introduction | 12
 Model FT4X
Introduction

Fig. 1.6: FT4X Menu Tree - CAL-V™ Menu

MAIN MENU
I/O FLO DSP EXIT

FLOW MENU 1
DGN UNT FM2 EXIT

DIAGNOSTIC MENU
SIM CAL‐V EXIT

CAL‐V MENU
VER EXIT

VERIFY CAL‐V?
YES NO Choosing “Hold Value” will
retain the last flow value while
test is being performed.
Hold Value
Go to zero
Flo: Hold Value
NXT EXIT OK

Take Control
off‐line EXIT OK

Verifying CAL‐V
Please Wait

Verifying CAL‐V
0.512 T=123

Displays a number value Displays the test’s

during test count down timer

CAL‐V=2.321 CAL‐V=0.259 CAL‐V=0.911

Fail OK Pass OK Warning OK

CAL‐V Fail CAL‐V Pass CAL‐V Warning

Greater than ±1.0 Less than ±0.80 Between ±0.80 to ±1.0

Introduction | 13
Model FT4X
Introduction

Fig. 1.7: FT4X Menu Tree - Gas-SelectX® Menu

MAIN MENU
I/O FLO DSP EXIT
The most recent list of available gases
FLOW MENU 1 can be found on the Fox Thermal
DGN UNT FM2 EXIT
website:
www.foxthermal.com/products/FT4X.php#gasSelectX
FLOW MENU 2
GAS PRM EXIT

Pure Gas GAS=O&G Mix

Mix
O&G Mix
NXT OK

Pure Gas
Be sure mixture
equals 100%.
Methane GAS=Methane GAS=Mix GAS=O&G Mix
CO2
Nitrogen NXT OK NXT OK NXT OK
Air
Natural Gas
Argon
Propane Methane = 65.5 % Ethane = 0 % Methane = 45.5 %
Helium CHG OK CHG OK CHG OK
Oxygen
Butane
Hydrogen CO2 = 25.5 % Ethylene = 0 % Ethane = 0 %
Ethane
CHG OK CHG OK CHG OK
Ethylene
Propylene
Nitrogen = 5 % Propylene = 0 % Propane = 54.4 %
CHG OK CHG OK CHG OK

Helium = 0 % i-Butane = 0 % i-Butane = 0 %

CHG OK CHG OK CHG OK

Argon = 0 % Pentanes = 0 % n-Butane = 0 %

CHG OK CHG OK CHG OK

Hydrogen = 0 % Hexanes = 0 % Pentanes = 0 %

CHG OK CHG OK CHG OK

Air = 0 % Heptanes = 0 % Hexanes = 0 %

CHG OK CHG OK CHG OK

Propane = 0 % Octanes = 0 % CO2 = 0 %

CHG OK CHG OK CHG OK

Butane = 0 % Nonanes+ = 0 % Nitrogen = 0 %

CHG OK CHG OK CHG OK

Oxygen = 0 % Heptanes = 0 %
CHG OK CHG OK

Octanes = 0 %
CHG OK
Err: Mix= 96% Gas Mix 100%
OR Nonanes+ = 0 % Nonanes+ = Total of all
CHG CHG OK
CHG OK gases C9 and greater.
Shows only if gas mix Shows only if no error is
does not equal 100.0%. detected. Pressing OK Ethylene = 0 %
allows exit to menu. CHG OK

Propylene = 0 %
CHG OK

Err: Mix=99.9% O&G Mix 100%

OR
CHG CHG OK
Shows only if gas mix Shows only if no error is
does not equal 100.0%. detected. Pressing OK
allows exit to menu.

Introduction | 14
 Model FT4X
Introduction

Fig. 1.8: FT4X Menu Tree - Log Menu 1

Enter Log Menu: Press F1 & F2 at the same time
Press F4 to return to normal mode
Enter Log Menu: Press F1 & F2 at the same time
Press F4 to return to normal mode
LOG MENU 1 Engineering Screens
LOG TOT ENG EXIT
LOG MENU 1
LOG TOT ENG EXIT Press F1 to navigate up
Press F2 to navigate down
Press F1 to navigate up
Press F4 to return to normal mode
Press F2 to navigate down
Day1=0 SCF 3124.6 SCFM Press F4 to return to normal
Flow rate mode
measured by the meter
Screen 10
NXT PRV
Day1=0 SCF EXIT csv = 0.3432
3124.6 SCFM Volt Flow rate measured by theofmeter
Current Sense Voltage sensor measurement circuit
Log Menu 2, p. 16 Display 10
NXT PRV EXIT csv = 0.3432 Volt Current Sense Voltage of sensor measurement circuit
Pulse=1234.5 cnt Digital control counts of Pulse output
Screen 11
mA_420=234cnt
Pulse=1234.5 cnt Digital
Digital control
control count
counts of of 4‐20mA
Pulse outputoutput
Display 11
mA_420=234 cnt Digital control count of 4‐20mA output
40 24‐hour totals listed Elp=12.5 HR Elapsed time of meter operation
Screen 12
40 24‐hour totals listed Stat(hex)=2800
Elp=12.5 HR Metertime
Elapsed function andoperation
of meter operation status code
Display 12
Stat(hex)=2800 Meter function and operation status code
Alarm=None Meter’s active alarms
Screen 13 Alarm=None Meter’s activeversion
alarmsof meter
Display 13 FT4X Vx.x Firmware
Day40=0 SCF FT4X V5.3 Firmware version of meter
Day40=0
NXT PRVSCF EXIT MB_Sn=P23949 Main board serial number
NXT PRV EXIT Screen 14 MB_Sn=P23949 Main board serialserial
number
Display 14 BB_Sn=P23945 Bridge board number
BB_Sn=P23945 Bridge board serial number
MTR_Sn=123456 Meter serial number
Screen 15 MTR_Sn=123456 Meter serial number
Display 15 SNS_Sn=234567 Sensor serial number
SNS_Sn=234567 Sensor serial number
FloHi=0.00 SCFM Alarm setting
Screen 16 FloHi=0.00 SCFM Alarm setting
Display 16 FloLo=0.00 SCFM Alarm setting
FloLo=0.00 SCFM Alarm setting
TmpHi=0.0°F°F
TmpHi=0.0 Alarm
Alarm setting
setting
Screen 17
Display 17
TmpLo=0.0°F°F
TmpLo=0.0 Alarm
Alarm setting
setting
Pwr_Cycl=24
Pwr_Cycl=24 Total
Total number
number of power
of power cycles
cycles
Screen 18
Display 18
Err_tot=0
Err_tot=0 Number
Number of errors
of errors in total
in total flowflow measurement
measurement

CAL‐V=0.1
CAL‐V= 0.1 CAL‐V
CAL‐V measurement
measurement value
value
Screen 19
Display 19
PwrOff=48.0
Pwr Off=48.0 Elapsed
Elapsed time
time of meter
of meter power
power off inoffhours
in hours

NOTE!
• All values in Log Menu 1 are view only. These values
cannot be changed from this menu

Fig. 1.9: FT4X Menu Tree - Reset Flow Total

F3 & F4 pressed at the same time will

F3 & F4 pressed
initiateat the same
a "Total" time will
reset
initiate a "Total" reset
Reset Total?
Reset
NO Total? YES
No Yes

Resetting Total
Resetting Total

Introduction | 15
Model FT4X
Introduction

Fig. 1.10: FT4X Menu Tree - Log Menu 2

Enter: Press F1 & F2 at the same time F3 & F4 pressed at the same time will
Press F4 to return to normal mode initiate a "Total" reset

LOGS MENU 1
LOG TOT ENG EXIT

LOGS MENU 2
Press NXT (F1) to navigate down
GAS CFG VAL EXIT
Press PRV (F2) to navigate back up

Pure Gas

Air
Argon Methane 100% GAS=O&G Mix Flow: SCFM CAL-V=0.1
Butane OK
CO2
OK NXT PRV EXIT NXT PRV EXIT
Methane
Natural Gas 1014.1 BTU/Ft3 Temp: °F CAL-V=Pass
Nitrogen
Oxygen NXT PRV EXIT NXT PRV EXIT NXT PRV EXIT
Helium Methane% = 45.0
Hydrogen
DNS=0.6800 Kg/M3 NXT PRV EXIT Ref Press: Psia P CAL-V=-0.14
Propane
Ethane PRV EXIT NXT PRV EXIT NXT PRV EXIT
Ethylene
Propylene Ethane% = 0.0 P CAL-V=Pass
Ch1: Flow
NXT PRV EXIT PRV EXIT
NXT PRV EXIT

Propane% = 55.0 20 Ma=706.29

NXT PRV EXIT NXT PRV EXIT
GAS=Mix
OK
i-Butane% = 0.0 4 Ma=0.00
NXT PRV EXIT NXT PRV EXIT

n-Butane% = 0.0 FloHi=0.00 SCFM

Methane% = 45.0 Ethane% = 0.0 NXT PRV EXIT NXT PRV EXIT
NXT PRV EXIT NXT PRV EXIT
Pentanes% = 0.0 FloLo=0.00 SCFM
CO2% = 0.0 Ethylene% = 0.0 NXT PRV EXIT
NXT PRV EXIT
NXT PRV EXIT NXT PRV EXIT
TmpHi=0.0 °F
Nitrogen% = 0.0 Propylene% = 0.0 Hexanes% = 0.0
NXT PRV EXIT
NXT PRV EXIT NXT PRV EXIT NXT PRV EXIT
TmpLo=0.0 °F
Helium% = 0.0 i-Butane% = 0.0 CO2% = 0.0 NXT PRV EXIT
NXT PRV EXIT NXT PRV EXIT NXT PRV EXIT
RefP=14.73 psia
Argon% = 0.0 Pentanes% = 0.0 Nitrogen% = 0.0 NXT PRV EXIT
NXT PRV EXIT NXT PRV EXIT NXT PRV EXIT
RefT=60.00 °F
Hydrogen% = 0.0 Hexanes% = 0.0 NXT PRV EXIT
Heptanes% = 0.0
NXT PRV EXIT NXT PRV EXIT
NXT PRV EXIT
Kfact=0.0%
Air% = 0.0 Heptanes% = 0.0 NXT PRV EXIT
NXT PRV EXIT NXT PRV EXIT Octanes% = 0.0
NXT PRV EXIT
Cutoff=12.5 SCFM
Propane% = 55.0 Octanes% = 0.0
NXT PRV EXIT
NXT PRV EXIT NXT PRV EXIT Nonanes+% = 0.0
NXT PRV EXIT
PipeID=4.03 In
Butane% = 0.0 Nonanes+% = 0.0
NXT PRV EXIT
NXT PRV EXIT NXT PRV EXIT Ethylene% = 0.0
NXT PRV EXIT Flt=0.80 Sec
Oxygen% = 0.0 1972.4 BTU/Ft3 NXT PRV EXIT
NXT PRV EXIT NXT PRV EXIT Propylene% = 0.0
NXT PRV EXIT MTR_Sn=123456
DNS=1.4223 Kg/M3 NXT PRV EXIT
PRV EXIT 1307.14 BTU/Ft3
NXT PRV EXIT FT4X V5.3
NXT PRV EXIT
DNS=0.982 Kg/M3
PRV EXIT Release: 11_30_17
PRV EXIT

Introduction | 16
 Model FT4X
Introduction

Welcome
Thank you for purchasing the model FT4X thermal gas mass flow meter from Fox Thermal. The FT4X
is one of the most technically advanced flow meters in the world. Extensive engineering effort has
been invested to deliver advanced features, accurate measurement performance and outstanding
reliability.

This instruction manual contains the electrical and mechanical installation instructions as well as
details for programming, maintaining and troubleshooting the meter. This manual is divided into
the following sections: Introduction, Installation, Wiring, Operation, Communications, Maintenance,
Appendices, Definitions, and Index.

Theory of Operation
The model FT4X is an innovative thermal mass gas flow meter and temperature transmitter. It is
microprocessor-based and field programmable. The FT4X thermal sensor operates on the law that
gases absorb heat. A heated sensor placed in an air or gas stream transfers heat in proportion
to the stream’s mass velocity. There are two sensor elements. One sensor element detects the
gas temperature and a second element is maintained at a constant temperature above the gas
temperature. The energy transferred from the heated element is proportional to the mass flow
velocity. The FT4X flow meter maintains accurate flow measurement over a large temperature and
pressure range.

Mass Flow
The model FT4X measures mass flow; an advantage over other flow meters which measure volumetric
flow rate. Volumetric flow is incomplete because temperature and pressure are unknown and must be
measured separately. For example, the mass flow of a gas depends on its temperature and pressure.
As temperature and pressure changes, the gas volume changes but not its mass. Therefore a device
measuring mass flow is independent of temperature and pressure changes. The model FT4X provides
a direct measurement of gas flow in mass units (kg/hr, lb/hr), standard units (SCFM, SLPM) or normal
units (NM3/hr, NLPM) with no additional temperature or pressure measurements required.

Calibration Validation
Validate the calibration of the FT4X in the field using the CAL-V™ test. The goal of Calibration
Validation is to provide operators with the ability to verify that the meter is capturing accurate data
at scheduled recalibration times - or at any time - instead of sending the meter back to the factory
for recalibration. By performing CAL-V™ in the field, operators can verify that the meter is running
accurately by testing the functionality of the sensor and its associated signal processing circuitry. This
test can be done in the pipe under normal process conditions.

Flow Calibration
Every Fox Thermal flow meter is set to the customer's configuration at the factory using an App ID
which is generated by the on-line configurator. The App ID specifies the gas type, flow range, serial
communication and other settings in the meter. If these settings match the final customer application,
the meter is ready to use. The Fox Thermal Calibration Lab maintains instrument calibration data on
every flow meter. Calibration files include details on process conditions, customer gas, line size and
other information. All NIST-traceable equipment utilized for the calibration procedure is identified on
the Calibration Certificate, which is sent with every flow meter.

Introduction | 17
Model FT4X
Introduction

DDC-Sensor™ Technology Description

The Fox Thermal DDC-Sensor™, a Direct Digitally Controlled sensor, is a state-of-the-art technology
unlike other thermal flow sensors available on the market. Instead of using traditional analog
circuitry, the DDC-Sensor™ is interfaced directly to the FT4X microprocessor for more control,
precision, and programmability. The DDC-Sensor™ quickly and accurately responds to changes in
process variables by utilizing the microprocessor to determine mass flow rate, totalized flow, and
temperature.

Fox Thermal's DDC-Sensor™ provides a technology platform for calculating accurate gas correlations.
The FT4X correlation algorithms allow the meter to be calibrated on a single gas in the factory while
providing the user the ability to select other gases in the Gas-SelectX® gas menu. Fox Thermal's
model FT4X with its DDC-Sensor™, state-of-the-art correlation algorithms, and advanced Data Logger
provide an accurate, multi-gas-capable thermal gas flow meter.

I/O Description
The FT4X features two galvanically isolated 4-20mA analog outputs, HART communication, a pulse
output, switch input, and Modbus RTU (RS485). There is also a USB port for interfacing with a laptop
or computer. The first 4-20mA output can be used for HART communication. The second 4-20mA
output can be configured for flow rate or process gas temperature and can be scaled by the user. The
pulse output can be used for pulse or alarm and is programmable to represent flow rate. The switch
input can be configured to reset the flow totalizer and elapsed time.

FT4X View™ interfaces to the USB port and is a free Fox Thermal PC-based software program that
displays flow meter readings and permits flow meter configuration. The software is available for
download on the Fox Thermal website.

FT4X Data Logger

The model FT4X has a Data Logger board used to record daily totals and configuration changes/
events (i.e. power on/off, alarms).

The FT4X Data Logger supports 40 daily total records. The meter is shipped with this function turned
off and must be activated by the user after the unit is powered on. When the number of samples
exceeds 40, the old data will be overwritten. Only the most recent 40 records are kept and day #1 is
always the latest total recorded.

Model FT4X firmware v6.0 and later have been equipped with Quality Transaction Record (QTR)
functionality per API MPMS 21.1 Chapter 5.2 (linear type meters). Refer to the FT4X View™ Software
Manual for data downloading instructions. Data that can be downloaded through FT4X View™
includes hourly and daily averages and totals. This data is saved for seven years as required by API
21.1.

Introduction | 18
 Model FT4X
Introduction

FT4X Functional Diagram

An on-board 2 line x 16 character backlit LCD display shows flow rate, total flow, elapsed time, process
gas temperature, and alarms. The display is also used in conjunction with the Configuration Panel for
field configuration of flow meter settings such as gas selection, 4-20mA scaling, pulse output scaling,
pipe area, flow cutoff, flow filtering, display configurations, diagnostics, communication parameters,
data logging, and alarm limits.

Fig. 1.11: FT4X Function Diagram

Standard I/O
12-24VDC Input Power 4-20mA Flow
100-240VAC Optional
4-20mA Flow or Temperature
Pulse or Alarm
Standard Display and
Configuration Panel Switch Input
F1 F2 F3 F4
Standard Digital Communications
USB
(Free FT4X View™ Software)

Optional Digital Communications

RS485 Modbus RTU

HART Communication

Outputs and Communications are

Galvanically Isolated

Introduction | 19
Model FT4X
Installation

Installation Scope
This section describes how to install the Fox Thermal model FT4X Flow Meter:

For Insertion Types:

1. Determine lateral position on the pipe.
2. Determine radial position of probe if moisture or condensation is present in the gas.
3. Verify sensor installation depth.
4. Determine sensor orientation in relation to sensor length and direction of flow.
5. Determine if the display orientation must be changed.
6. Ensure proper tightening of compression fitting for mounting meter.

For Inline Types:

1. Determine lateral position on the pipe.
2. Flow body orientation in relation to direction of flow in pipe.
3. Changing the display orientation.
4. Proper tightening of compression fitting.

Installation procedures must be performed using a combination of the end user’s best engineering
practices, in compliance with local codes, and with manufacturer’s recommendations.

General Precautions
The following general precautions should be observed:
1. Exercise care when handling the flow meter to avoid damaging the probe, sensor or
enclosure.
2. Close any unused conduit openings in the enclosure with plugs certified for your
application.
3. The enclosure cover must be closed except during installation or configuration.
4. Mounting FT4X in direct sunlight can cause the temperature inside the enclosure to
increase beyond design limits, resulting in failure of LCD display and reduced component
life. It is recommended that a sunshade be installed to avoid direct sunlight (see maximum
enclosure operating temperature specification).
5. Ensure the flow direction indicator/pointer for the meter is in line with the direction of flow
in the pipe.
6. Do not install the FT4X enclosure near an igniter, igniter-controller or switching equipment.
7. Do not install an external power supply in a cabinet containing an igniter controller or
switching equipment.
8. For accurate flow measurement, review flow meter placement instructions before
installation to ensure a proper flow profile in the pipe.
9. For safety reasons, Teflon ferrules are only appropriate for applications with pressures of 60
psig or less. At higher pressures, use of a Teflon ferrule risks unwanted probe movement
or ejection of the probe from the pipe. For all applications above 60 psig, the standard
stainless steel ferrule is required.

Installation | 20
 Model FT4X
Installation

Instructions for Flow Meter Lateral Placement

Install the model FT4X flow meter so that it is far enough away from bends in the pipe, obstructions,
or changes in line sizes to ensure a consistent flow profile. See Fig. 2.1 below for your meter type.
Fig. 2.1: Upstream and Downstream Pipe IDs for Insertion and Inline Flow Meters
INSERTION
Branch Outlet
Proper (installed by
Irregular Flow
Flow
F1 F2 F3 F4

Profile customer)
Profile

FLOW

15X Pipe ID min. 10X Pipe ID min.

INLINE
Proper
Irregular Flow
Flow
F1 F2 F3 F4

Profile
Profile

FLOW

8X Pipe ID 4X Pipe ID
min. min.

INSERTION WITH FC20

FC20 Flow Conditioner
installed between two flanges
Proper Branch Outlet
Flow (installed by customer)
Profile
Irregular Flow
F1 F2 F3 F4

Profile

FLOW

5X Pipe ID 2X 5X Pipe ID
min. Pipe ID min.

NOTE!
• Pipe ID = Inside Diameter
• The probe diameter is ¾"
• An irregular flow profile will affect sensor accuracy
• See FC20 Installation Instructions (PN109193) for more information

Installation | 21
Model FT4X
Installation

Radial Probe Position - Moisture in the Gas or Condensation

The radial position of the meter may help reduce collection of moisture on the sensor. Condensing
liquids contacting the meter's sensing elements will disrupt accurate flow measurement. Fox Thermal
recommends the flow meter be used in dry gas conditions whenever possible for highest accuracy.
Contact Fox for further recommendations.

Fig. 2.2: Installation at 180°

Alternate Installations - Vertical Pipes or Restricted Installation Spaces

When restricted physical installation space exists, the FT4X can also be installed at other angles. Please
note that the display and the enclosure orientation can be rotated in 90º increments.

Fig. 2.3: Alternate Installation at 90° (CCW)

Installation | 22
 Model FT4X
Installation

Welding Branch Fitting to Pipe

The probe of the FT4X must be installed perpendicular to the pipe to measure flow accurately. Use the
following steps to ensure that the 1" branch fitting is correctly welded to the pipe.
Directions:
1. Drill a 0.781" (25/32") hole through the wall of the pipe (1 wall only).
2. Assemble the compression fitting and branch fitting hand tight onto the probe of the FT4X.
3. Insert the probe into the hole in the pipe and use the FT4X probe and compression fitting to align
the branch fitting with the hole and the probe perpendicular to the pipe.
4. Tack-weld the branch fitting carefully onto the pipe.
• Before welding the fitting completely, verify the probe is aligned to the center of the pipe and
the hole is centered in the branch fitting (see Figure 2.4).
5. To verify that the correct hole position has been achieved, carefully slide the 0.75" sensor in and
out of the branch fitting and 0.781" hole.

WARNING! Do not force the sensor through the 0.781" hole. Forcing it through the 0.781"
hole can damage the probe.

6. Verify that the temporary weld of the branch fitting positions the probe window on the pipe's
centerline.
• The picture on the right side of Figure 2.4 shows an incorrect welding of the branch fitting,
causing the probe to be "off center".
7. Once the branch fitting is aligned properly, remove the probe from the branch fitting and finish
welding. Then verify the probe is still aligned with the center of the pipe.
8. Set the depth of the flow meter (see "Fig. 2.5: Insertion Sensor Depth in Pipe" on page 24).
• Do not tighten compression fitting until proper depth of flow meter is determined.

Fig. 2.4: Alignment of Branch Fitting

CORRECT BRANCH INCORRECT BRANCH

FITTING FITTING

PIPE PIPE
0.781” 0.781”
HOLE HOLE
Ø.75" Ø.75"
PROBE PROBE

PIPE PIPE
CENTERLINE OFF CENTERLINE
CENTERED
CENTER

Installation | 23
Model FT4X
Installation

Installation Depth
The installation depth of the sensor in the pipe is dependent on the pipe size. To get the most
accurate reading, proper placement of the sensor window within the pipe is necessary. As shown
in Fig 2.5, the end of the sensor window should be 0.73" (18.5 mm) past the center line of the pipe.
Review the dimensional drawing below with the following equation to calculate insertion depth:
L +D/2 + .73" = insertion depth.
Insertion depth is measured from the top of the compression fitting to the bottom end of the probe.

CAUTION! For a 1½" pipe, do not tighten compression fitting without 0.2” distance from wall
or damage to probe will occur.

Fig. 2.5: Insertion Sensor Depth in Pipe

F1 F2 F3 F4

COMPRESSION FITTING
(SUPPLIED BY FOX)

BRANCH FITTING, 1" NPT

(SUPPLIED BY CUSTOMER)
"L"

L + D/2 + .73" =
INSERTION DEPTH
"D/2"

.73
"D"

Installation | 24
 Model FT4X
Installation

Mounting Instructions - Compression Fittings (New Insertion Meters Only)

FT4X insertion style flow meters are mounted through a 0.781" hole and a 1-inch female NPT branch
outlet in the customer's pipe. Insertion style flow meters are not designed for use in pipes smaller
than 1½".
• Install the compression fitting into the 1-inch female NPT branch outlet.
• When installing in a 2" pipe or larger, install the end of the probe 0.73" (18.5 mm) past the
center line of the pipe (refer to figure 2.5).
• When installing into a 1½" pipe, carefully install the probe into the pipe until it touches the
opposite wall and pull back 0.2".
• Rotate the nut finger-tight.
• Further tighten the nut just enough until the tube will not turn by hand or move axially in the
fitting.
• Mark the nut at the 6 o'clock position.
• While holding the fitting body steady, tighten the nut one and one-quarter (1 ¼) turns to the 9
o'clock position. See Figure 2.6.

Fig. 2.6: Proper Tightening of the Compression Fitting Nut

NOTE! Before removing a probe with compression fitting, mark the tube at the back
of the nut, and mark a line along the nut and fitting body. Use these marks when
reinstalling the probe. Reference the instructions on p. 26.
NOTE! When installing a probe with compression fitting that has been tightened
previously, use the instructions on p. 26.
CAUTION! For a 1½" pipe, do not tighten compression fitting without 0.2” distance
from wall or damage to probe will occur.
CAUTION! Once the stainless steel compression fitting ferrule is locked onto the probe,
the probe can be removed or rotated, but the insertion depth is locked in place.
CAUTION! If the stainless steel or teflon ferrules are not properly tightened, and/or the
recommended pressure is exceeded, the ferrules can slip on the stainless steel tubing
causing damage to the meter or bodily harm.

Installation | 25
Model FT4X
Installation

Mounting Instructions - Compression Fittings (Inline and Insertion Meters Previously Installed)
In cases where a compression fitting has already been swaged in an inline flow body or an insertion
meter, use the following procedure.
• Carefully insert the probe with swaged ferrules into the fitting until the front ferrule seats against
the fitting (see Figure 2.7).
• Verify that the probe is installed the correct depth in the pipe (refer to Figure 2.5 on p. 24).
• Rotate the nut with a wrench until the probe and nut are in their previously marked positions, or
you feel a significant increase in resistance (see Figure 2.7).
• Tighten the nut slightly (approximately 1/8 turn).

Fig. 2.7: Proper Re-Tightening of the Compression Fitting Nut

CAUTION! Do not use a gap inspection gauge with reassembled fittings.

Installation | 26
 Model FT4X
Installation

Rotating the Enclosure

The model FT4X enclosure has been designed to allow the enclosure to rotate for optimal viewing of
the display. To rotate the enclosure, first loosen the two set screws near the Flow Direction Indicator.
Then rotate the enclosure into the desired position and tighten the set screws. Do not rotate the
enclosure more than 360 degrees.

Direction of Flow and Orientation of the Probe

Install the meter with the flow direction indicator pointing in the direction of flow and centered on
the middle of the pipe. The rotational misalignment of the flow direction indicator must be less than 2
degrees.

Fig. 2.8: Orientation of Flow Meter

SIDE VIEW

SET SCREW FLOW DIRECTION

INDICATOR

CUSTOMER
PIPE

FLOW

TOP VIEW
CUSTOMER
PIPE Note: Rotational misalignment
should not exceed ±2°
+2°

FLOW

-2°

FLOW DIRECTION
INDICATOR

Installation | 27
Model FT4X
Installation

Changing the Orientation of the FT4X Display

The display can be rotated in 90° increments for optimum viewing of the screen. First, open the
enclosure by unscrewing the enclosure cap and loosen the two captive screws to open the display
assembly. Detach the display board from the metal shield by loosening the three screws on the back
of the round shield. Rotate the display board to the desired orientation. Ensure that the display cable
is routed flat and straight through the display hinge to prevent binding. Reattach the display board
to the metal shield by tightening the three screws. Close the display assembly and secure it to the
enclosure with the two captive screws. Finally, install the enclosure cover back on the front of the
enclosure.

Fig. 2.9: Rotating the Display Orientation

F1 F2 F3 F4

Loosen these two screws to Loosen these three screws

open the display. to rotate the display in 90°
increments (±180°).

Installation | 28
 Model FT4X
Installation

Installation of a New Retractor Assembly

1. Remove collar clamp from probe using a 3/16" Hex Key.

2. Remove meter probe from retractor assembly and leave the ball valve open. Keep the collar spacer on
the probe so it is not misplaced.
3. Install the valve assembly on the pipe, by tightening the Hex Nipple with a 1 3/8" wrench.

Fig. 2.10: Retractor Assembly With and Without Probe Installed

Collar Collar clamp

spacer

Hex Nipple

Installation | 29
Model FT4X
Installation

4. Carefully slide the probe through the retractor assembly and through the hole to see if there is
interference by touching the pipe wall with the end of the probe on the far side or until the probe
cannot go deeper. Remove the probe. Remove the retractor and rework the hole, if required.

Fig. 2.11: Verify Probe Insertion

Installation | 30
 Model FT4X
Installation

5. Using the equation (L + D/2 + 0.73") from Figure 2.12, calculate the insertion depth and mark on the
probe while measuring from the end of the probe.
6. The Retractor Clearance table of Figure 2.12 lists the space required to remove the meter from the
retractor. Use the model code of your meter to determine the dimension.

Fig. 2.12: Determining and Marking Insertion Depth

RETRACTOR CLEARANCE
CODE "RC" DIMENSION
15R 23.9" [60.7 CM]
18R 26.5" [68.3 CM]
24R 32.5" [83.6 CM]
30R 38.5" [98.8 CM]
36R 44.5" [114.0 CM]

"RC"
RETRACTOR
CLEARANCE

MARK ON PROBE

"L"

BRANCH FITTING
1 INCH NPT, FEMALE INSERTION DEPTH:
L + D/2 + .73"

"D/2"

"D"

.73
[18.5mm]

Installation | 31
Model FT4X
Installation

7. Insert probe back into the retractor to the depth mark and hand-tighten the compression fitting. Make
sure collar spacer is in place on the probe.
8. Verify that flow direction indicator is in line with pipe and in the direction of flow.

Fig. 2.13: Installed Retractor

Flow direction
indicator

Collar spacer

Collar clamp

Compression nut &

ferrules

Compression fitting

Bracket

9. Fully tighten compression fitting (refer to the instructions on p. 25).

10. Install collar clamp back on probe just below the collar spacer. Install collar so that the cable mounting
hole is in line with the mounting hole on the bracket.

NOTE! For instructions on how to properly remove and replace the meter from a retractor, please
refer to "Instructions for Removing and Inserting the Meter from a Pressurized Pipe using the
Retractor" on page 100.

Installation | 32
 Model FT4X
Wiring

Wiring Instructions
To wire the FT4X connect the power and signal wires to the terminal blocks according to the labeling and
instructions on the following pages.

Fig. 3.1: FT4X Wiring Access

Front Enclosure Cap Rear Enclosure Cap

Unscrew front enclosure cap to access the Unscrew the rear enclosure cap to access wiring
display, configuration panel, and remote sensor terminals for power, 4-20mA and pulse outputs,
wiring terminals. remote switch input, serial communication, and
the USB port.

F1 F2 F3 F4

Display
front panel

Rear of
display
Unscrew two bottom
screws and swing open
display to access remote
sensor wiring

USB Port

NOTE! Cut all wires as short as allowable for a minimum service loop. Obtain the correct
length for the FT4X wires using one of these methods:
• Conduit not connected to meter: 6" of wires exposed from end of conduit
• Conduit connected to meter: extend wire beyond enclosure face (w/o cover) +2.5"

Wiring | 33
Model FT4X
Wiring

Wiring Precautions

WARNING!
• DO NOT OPEN THE ENCLOSURE WHEN ENERGIZED OR AN EXPLOSIVE ATMOSPHERE IS
PRESENT.
• Connect earth ground to a chassis ground screw on the inside of FT4X enclosure.
• All plumbing and electrical installations of flow meters must be in compliance with local codes,
the end user’s best engineering practices, and manufacturer’s recommendations.
• Do not install the FT4X enclosure near an igniter, igniter-controller or switching equipment to
eliminate the possibility of noise interference.
• Do not install an external power supply in a cabinet containing an igniter controller or switching
equipment.
• This flow meter contains components that can be damaged by static electricity. You must
discharge yourself by touching a grounded steel pipe or other grounded metal prior to working
inside this flow meter.
• Close any unused conduit openings with suitable certified plugs

Wiring | 34
 Model FT4X
Wiring

Power Wiring
For AC or DC power wiring, use stranded copper wire. Twisted pair shielded cable is recommended for 12
to 24VDC power. Supply connection wiring must be rated for at least 90ºC.

Grounding
The enclosure must be properly grounded with a quality earth ground. 16 gauge, stranded wire is
recommended. For US and Canada installation, the internal ground terminal on the enclosure must be
used. Use of the external ground terminal is optional.

Signal Wiring
For signal wiring, the recommended wire gauge is 18 to 22 AWG. Always use twisted pair shielded
cable. Cable shields should be connected to a good earth ground at one end only.

Modbus Serial Communication Wiring

A shielded 22 to 18 gauge three conductor cable is recommended for Modbus communication wiring.
Two of the wires in the cable should be twisted pair and used for the Modbus transmit and receive
signals. The third wire is for the Modbus common signal. The shield drain wire of the cable should be
connected to chassis or earth ground at the Modbus modem. Belden number 3106A or a similar type of
cable is recommended, depending on the environment or temperature requirements of the application.

Remote Sensor Wiring

NOTE! Remote wiring is only required when the Remote Electronics option is provided.

NOTE! Serial Numbers: If you have more than one meter, you must ensure that the serial
numbers of the probe/remote enclosure, electronics enclosure, and flow body match one
another. These items have been manufactured and calibrated to operate as a unit and cannot
be mismatched.

For remote sensor wiring use Belden number 5306FE or similar type of cable, depending on
environment or temperature requirements of the application. Make sure that the cable length does
not exceed 100 feet and the wire resistance does not exceed one ohm. Connect the cable shield at the
remote enclosure end.

Wiring | 35
Model FT4X
Wiring

Power Input Requirements: 12 to 24VDC

External DC power supply must provide 12 to 24VDC (10 to 30VDC full input power range) at 6 Watts
minimum.
(With 12VDC power, the FT4X can use up to 500mA. With 24VDC power, the FT4X can use up to
250mA.)

A 20 Watt or greater power supply is recommended to ensure it can provide enough current under all
temperature, ventilation, and power on conditions.

The enclosure must be properly grounded with a quality earth ground. Sixteen (16) gauge, stranded
wire, is recommended for earth ground.

For US and Canada Zones installations, the internal ground terminal on the enclosure must be used.
Use of the external ground terminal is optional.

Connect the power wiring as shown in the diagram below.

Fig. 3.2: Connections for 12 to 24VDC Supply

EARTH GROUND

TS2 F1 0.75A
1 SWITCH INPUT (+) TS1
2 SWITCH INPUT (-) POWER (+) 1 +12 TO 24VDC
3 PULSE (+) POWER (-) 2
TP1 12 TO 24VDC RETURN
4 PULSE (-) 4-20mA #1 (+) 3
5 Tx/Rx (+) TP2
4-20mA #1 (-) 4
6 Tx/Rx (-) 4-20mA #2 (+) 5
7 COMMON 4-20mA #2 (-) 6
W1
TERMINATION

J1
USB

CAUTION!
• Supply connection wiring must be rated for at least 90°C.

Wiring | 36
 Model FT4X
Wiring

Power Input Requirements: 100 to 240VAC

If the FT4X has the AC power supply option, the AC power must provide 100 to 240VAC at 7 Watts
minimum.

Connect the power wiring to terminals TS1 pins 1 and 2 as shown in the diagram below.

The enclosure must be properly grounded with a quality earth ground. Sixteen (16) gauge, stranded
wire, is recommended for earth ground.

For US and Canada installations, the internal ground terminal on the enclosure must be used. Use of
the external ground terminal is optional.

Fig. 3.3: Connections for 100 to 240VAC Supply

EARTH GROUND

TS2 TS1 100 to 240VAC

1 SW(+)
POWER
100/240VAC 50-60Hz
2 SW(-) AC(N) ( )1 (N)
3 PUL(+) AC(L) ( )2
TP1 (L)
4 PUL(-) FLOW (+) 3
5 T/R(+) TP2
FLOW (-) 4
6 T/R(-) 4-20mA (+) 5
7 Tx/Rx 4-20mA (-) 6
(COM)
W1
TERMINATION

J1
USB

CAUTION!
• Supply connection wiring must be rated for at least 90°C.

Wiring | 37
Model FT4X
Wiring

4-20mA Output and HART Communication Wiring: Customer-Supplied Power Source

(Recommended)
Bring the wiring in through either conduit hub. Connect the 4-20mA flow rate, 4-20mA temperature,
and HART communication option wiring as shown in the diagram below.

Fig. 3.4: 4-20mA Output Wiring for Isolated Customer-Supplied Power Source

FT4X Customer PLC or DCS

+12 to 24VDC

HART
TS2 F1 0.75A
+ Modem
1 SWITCH INPUT (+) TS1
2 SWITCH INPUT (-)
3 PULSE (+)
POWER (+) 1
4-20mA Flow Rate
250 ohms typical with 24VDC Power
POWER (-) 2
TP1
4 PULSE (-)
125 ohms or less for 12VDC Power
4-20mA #1 (+) 3
5 Tx/Rx (+) TP2
4-20mA #1 (-) 4
6 Tx/Rx (-) 4-20mA #2 (+) 5
*(see note below)
7 COMMON 4-20mA #2 (-) 6 -
W1
TERMINATION 12 to 24VDC Return
J1
USB +12 to 24VDC

4-20mA Temperature or Flow Rate

250 ohms typical with 24VDC Power
125 ohms or less for 12VDC Power
*(see note below)
-
12 to 24VDC Return

NOTE!
• When using a 12 volt power supply, the load resistor on the 4-20mA output must be
125 ohms or less to operate properly.
• When using 24 volt power, the load resistor is typically 250 ohms. A 250 ohm resistor
in the 4-20mA circuit will result in a 1 to 5 volt signal to the PLC or DCS.
• When using a 24 volt power supply, the load resistor on the 4-20mA output must be
600 ohms or less.
• Some PLC and DCS equipment have built in load resistors, please refer to the technical
manuals of such equipment.

Wiring | 38
 Model FT4X
Wiring

4-20mA Output and HART Communication Wiring: Loop Power Provided by FT4X
(12 to 24VDC power option only)
Bring the wiring in through either conduit hub. Connect the 4-20mA flow rate, 4-20mA temperature,
and HART communication option wiring as shown in the diagram below.

Fig. 3.5: 4-20mA Output Wiring for Loop Power Provided by FT4X (DC Power Only)

FT4X Customer PLC or DCS

+12 to 24VDC
TS2 F1 0.75A 12 to 24VDC Return
1 SWITCH INPUT (+) TS1
2 SWITCH INPUT (-) POWER (+) 1
3 PULSE (+) POWER (-) 2
TP1
4 PULSE (-) 4-20mA #1 (+) 3
5 Tx/Rx (+) 4-20mA #1 (-) 4
TP2 + HART
6 Tx/Rx (-) 4-20mA #2 (+) 5 Modem
7 COMMON 4-20mA #2 (-) 6
W1 4-20mA Flow Rate
TERMINATION 250 ohms typical with 24VDC Power
J1
125 ohms or less for 12VDC Power
USB - *(see note below)

4-20mA Temperature or Flow Rate

250 ohms typical with 24VDC Power
125 ohms or less for 12VDC Power
*(see note below)
-

NOTE!
• When using a 12 volt power supply, the load resistor on the 4-20mA output must be
125 ohms or less to operate properly.
• When using 24 volt power, the load resistor is typically 250 ohms. A 250 ohm resistor in
the 4-20mA circuit will result in a 1 to 5 volt signal to the PLC or DCS.
• When using a 24 volt power supply, the load resistor on the 4-20mA output must be
600 ohms or less.
• Some PLC and DCS equipment have built in load resistors, please refer to the technical
manuals of such equipment.

Wiring | 39
Model FT4X
Wiring

Pulse/Alarm Output Wiring: Customer Supplied Power Source (Recommended)

Bring pulse/alarm wiring in through either conduit hub. Connect the pulse/alarm wiring as shown in
the diagram below. The pulse/alarm output is an open collector circuit capable of sinking a maximum
of 20mA of current. Pulse or alarm selection is programmed using the display or FT4X View™. Only
one option, pulse or alarm, can be active at a time.

Fig. 3.6: Pulse/Alarm Output Isolated (Recommended)

CUSTOMER PLC OR DCS FT4X

+12 to 24VDC

2.4K Ohm typical with 24VDC Power

1.2K Ohm typical with 12VDC Power TS2 F1 0.75A
1 SWITCH INPUT (+) TS1

+ 2 SWITCH INPUT (-) POWER (+) 1

- 3 PULSE (+)
Pulse or Alarm Output
POWER (-) 2
TP1
4 PULSE (-) 4-20mA #1 (+) 3
5 Tx/Rx (+) TP2
4-20mA #1 (-) 4

12 to 24VDC Return
6 Tx/Rx (-) 4-20mA #2 (+) 5
7 COMMON 4-20mA #2 (-) 6
W1
TERMINATION

J1
USB

NOTE!
• The FT4X Pulse/Alarm output is typically used to drive digital circuitry or solid-
state relays. The output of a solid state relay may, in turn, operate loads such as
electromechanical relays or alarm indicators.
• The maximum load current of the Pulse/Alarm output is 20mA. Choose a load
resistance that provides 10 to 20mA with the power supply operating voltage.
• When the output is configured for Alarm and an alarm is not active, the output
will be on (0 volts output). When an alarm is active, the output will be off
(12 to 24 volts output).

Wiring | 40
 Model FT4X
Wiring

Pulse/Alarm Output Wiring: Power Provided by FT4X (12 to 24VDC power option only)
Bring pulse/alarm wiring in through either conduit hub. Connect the pulse/alarm wiring as shown in
the diagram below. The pulse/alarm output is an open collector circuit capable of sinking a maximum
of 20mA of current. Pulse or alarm selection is programmed using the display or FT4X View™. Only
one option, pulse or alarm, can be active at a time.

Fig. 3.7: Pulse/Alarm Output Power Provided by FT4X (DC Power Only)

Customer PLC or DCS FT4X

+12 to 24VDC
12 to 24VDC Return

2.4K Ohm typical with 24VDC Power

1.2K Ohm typical with 12VDC Power
TS2 F1 0.75A
1 SWITCH INPUT (+) TS1
2 SWITCH INPUT (-)
Pulse or Alarm
POWER (+) 1
+ 3 PULSE (+) POWER (-) 2
- TP1
Output 4 PULSE (-)
5 Tx/Rx (+)
4-20mA #1 (+) 3
TP2
4-20mA #1 (-) 4
6 Tx/Rx (-) 4-20mA #2 (+) 5
7 COMMON 4-20mA #2 (-) 6
W1
TERMINATION

J1
USB

NOTE!
• The FT4X Pulse/Alarm output is typically used to drive digital circuitry or solid-
state relays. The output of a solid state relay may, in turn, operate loads such as
electromechanical relays or alarm indicators.
• The maximum load current of the Pulse/Alarm output is 20mA. Choose a load
resistance that provides 10 to 20mA with the power supply operating voltage.
• When the output is configured for Alarm and an alarm is not active, the output
will be on (0 volts output). When an alarm is active, the output will be off
(12 to 24 volts output).

Wiring | 41
Model FT4X
Wiring

Switch Input Wiring

A remote switch can be used to reset the Totalizer and elapsed time, if enabled in the programming
settings. Connect the switch input wiring as shown in the diagram below.

Fig. 3.8: Switch Input Wiring

Customer PLC or DCS FT4X

TS2 F1 0.75A
1 SWITCH INPUT (+) TS1
Remote Switch 2 SWITCH INPUT (-) POWER (+) 1
3 PULSE (+) POWER (-) 2
TP1
4 PULSE (-) 4-20mA #1 (+) 3
5 Tx/Rx (+) TP2
4-20mA #1 (-) 4
6 Tx/Rx (-) 4-20mA #2 (+) 5
7 COMMON 4-20mA #2 (-) 6
W1
TERMINATION

J1
USB

Wiring | 42
 Model FT4X
Wiring

RS485 Wiring for Modbus RTU (RS485)

Wiring connections are made as shown in the diagram below for Modbus communication.

Termination Resistor
Connect a termination resistor across the receive/transmit signals of the last device on the
communication line. To connect the 121 ohm termination resistor on the FT4X, set jumper W1 to the
TERM position.

Disconnect the termination resistor on all other external RS485 devices. The termination resistor of
the FT4X is disconnected by setting jumper W1 to the "open" position.

Fig. 3.9: RS485 Wiring

TS2 F1 0.75A
1 SWITCH INPUT (+) TS1
2 SWITCH INPUT (-) POWER (+) 1
3 PULSE (+) POWER (-) 2
TP1
4 PULSE (-) 4-20mA #1 (+) 3
TP2
Tx/Rx(+) 5 Tx/Rx (+) 4-20mA #1 (-) 4
Tx/Rx(-) 6 Tx/Rx (-) 4-20mA #2 (+) 5
Communication Common 7 COMMON 4-20mA #2 (-) 6
Shield W1
TERMINATION

J1
Termination Resistor Jumper W1 USB

Termination Resistor Jumper (detail)

No Termination (Open) Terminated

NOTE!
• W1 jumper will either be in the open or terminated
position. It should be in the terminated position on the
last meter in the series.

Wiring | 43
Model FT4X
Wiring

HART 4-20mA Output Wiring: Handheld Communicator

The 4-20mA current loop and HART modem connections are shown on p. 38 and p. 39.

A handheld HART communicator can be connected to test points TP1 (+) and TP2 (-) with clip leads or
to the 4-20mA terminal block.

Fig. 3.10: HART 4-20mA Output Wiring, Handheld Communicator

FT4X Customer PLC or DCS

HART Handheld
Communicator

TS2 F1 0.75A
1 SWITCH INPUT (+) TS1
2 SWITCH INPUT (-) POWER (+) 1
3 PULSE (+) POWER (-) 2
TP1
4 PULSE (-) 4-20mA #1 (+) 3 +12 to 24VDC
5 Tx/Rx (+) TP2
4-20mA #1 (-) 4
6 Tx/Rx (-) 4-20mA #2 (+) 5
7 COMMON 4-20mA #2 (-) 6
W1 4-20mA
*(see note for Fig. 3.3)
TERMINATION

J1
USB

12 to 24VDC Return

Wiring | 44
 Model FT4X
Wiring

Remote Sensor Wiring

Remote sensor wiring is only necessary when the remote sensor option has been ordered.

Fig. 3.11: Remote Sensor Wiring

Remote Wiring
F1 F2 F3 F4

3 X Port,
Remote Cable
3/4 " NPT Female
18 Gauge, 8 Conductor,
Shielded, 100ft (30.48m) Max.

Use an extension cable to connect the FT4X remote sensor to the electronics enclosure.

Eight wire shielded cable required. The shielded cable should be run through a separate grounded
steel conduit (no other cables or wires in the conduit). If you are using your own cable, make sure that
the cable length does not exceed 100 feet and has a wire resistance that does not exceed one ohm
(18 AWG recommended). The remote sensor wiring connections are shown on the following pages.

NOTE! Do not connect the cable shield at the electronics enclosure end. Connect the cable
shield at the remote sensor terminal.

NOTE! The enclosures must be properly grounded with a quality earth ground. 16 gauge,
stranded wire is recommended.

NOTE! Serial numbers: If you have more than one meter, you must ensure that the serial
numbers of the probe/remote enclosure, electronics enclosure, and flow body match one
another. These items have been manufactured and calibrated to operate as a unit and
cannot be mismatched.

Wiring | 45
Model FT4X
Wiring

Fig. 3.12: Remote Sensor Wiring

Electronics Enclosure
Remote Wiring Terminals are accessed
by opening the front display panel

Cable
Shield
1
2
3
4
5
6
7
8
9

Detail Remote Wiring Terminal

Located inside J-Box
hinged cover panel
Remote Wiring Terminal

Remote Enclosure

Customer Wires

Sensor Wires
Probe Sensor Wired By Fox

Wiring | 46
 Model FT4X
Wiring

Table 3.1: Remote Sensor Cable Wiring

Electronics Enclosure Extension Cable Remote Enclosure Sensor Wire

Terminals Wire Color Terminal Numbers Color

Red Red 1 Red

Red Brown 2 Red
White White 3 White
White Black 4 White
Blue Blue 5 Blue
Blue Green 6 Blue
Yellow Yellow 7 Yellow
Yellow Orange 8 Yellow
No Connection Shield 9

NOTE! Wire colors listed here represent the wire colors of cables supplied by Fox Thermal.
Colors may vary if customer is supplying their own cable.

Wiring | 47
Model FT4X
Operation

Start Up Sequence
The program automatically enters the Run/Measure mode after power up. The screen will show the
firmware version of the FT4X during power up.

USB Interface
The USB interface is a standard feature which allows communication with a PC to monitor readings
and configure settings. FT4X View™, is a free application program from Fox Thermal that connects
to the USB interface and allows data monitoring, configuration setting, data logging to Excel, and an
option to save and recall FT4X configuration data.

FT4X Display and Configuration Panel

The FT4X has a 2 line x 16 character display with 4 mechanical buttons. The meter can be
programmed by using the display and configuration panel. The configuration panel can be accessed
by removing the FT4X cap. Be sure to replace the cap after you are done configuring the FT4X.

Fig. 4.1: FT4X Display and Configuration Panel

Display Screen

Mechanical (Push) Buttons F2 F3

Operation | 48
 Model FT4X
Operation

Measurement Mode Display Screens

In the measurement mode, there are four different display screens (display 1, 2, 3 and a prompt
screen to enter the programming mode). Two display screens are user programmable (refer to Display
Setup p. 56). Scrolling through the display is accomplished by pressing the F1 or F2 key to view the
next or previous screen.

Pressing the F1 and F2 keys at the same time enters the Log Menu and Engineering Menu screens
(refer to p. 15).

Pressing the F3 and F4 keys at the same time brings up the Reset Total screen prompt.

Fig. 4.2: FT4X Measurement Mode Display Screen Navigation

F1 key: Moves up one screen

F2 key: Moves down one screen
F1

Display #1 1456.5 SCFM

(User programable screen)
Tot=123456 SCF

F1 F2 F3 F4
Enter “totalizer reset screen”
when F3 & F4 are pressed at
the same time
Display #2 Elp = 14.6 HR
(User programable screen)
88.5˚ F

F1 F2

Display #3 Alarm = None (Fixed screen)

Gas = Air

F1 F2

Display #4 Set Parameter?

(Fixed screen)
No Yes

F2 F4
Enter programming screen
Requires password.
Default is 1234.

Operation | 49
Model FT4X
Operation

Programming: Data Entry using the Display and Configuration Panel

There are 2 basic types of menu entries: one for changing value or string and one for selecting from a
selection list.

To Change a Value or String :

VALUE = 0.91234
CHG OK

F1 F2 F3 F4

Press CHG (F1) key to change the value, OK (F4) to accept the value.

VALUE = 0.91234
UP DN NXT OK

F1 F2 F3 F4

Press the UP (F1) or DN (F2) key to select a new digit or character, the cursor points to the selected
digit. Press NXT (F3) to select the next digit and OK (F4) to accept the entry.

To Select from a List:

FLO UNT = SCFM

NXT OK

F1 F2 F3 F4

Press NXT (F1) key repeatedly until the correct selection is made and OK (F4) key to accept the entry.

Entering the Programming Mode

To enter the programming mode and access the Main Menu, press the F1 or F2 key in the normal
running mode until the following screen is shown:

SET PARAMETERS ?
No Yes

F1 F2 F3 F4

Press YES (F4) and the following screen will prompt user to enter password:

PASWD:_
UP DN NXT OK

F1 F2 F3 F4

Enter the correct password, then follow the instructions for changing a value as specified on page p.
50. The default Level 1 password is “1234”.

Operation | 50
 Model FT4X
Operation

If the wrong password is entered, the message “Wrong Password” will display and then return to the
programming entry screen.

Main Menu
If the password is accepted, the Main Menu screen will be shown:

MAIN MENU
I/O FLO DSP EXIT

F1 F2 F3 F4

This is the Main Menu screen for the programming mode. To exit the programming mode, press EXIT
(F4) repeatedly until “Normal Mode” is briefly displayed.

Analog 4-20mA Outputs

The following menu allows the scaling of the analog 4-20mA output. From the Main Menu, press I/O
(F1) to move to the 4-20mA output selection. In this screen press 420 (F3) (screen appearance may
vary according to options).

SET I/O
COM PUL 420 EXIT

F1 F2 F3 F4

The 4-20mA output is programmable for flow or temperature:

mA=Flow
NXT OK

F1 F2 F3 F4

Selections for the 4-20mA output are:

Flow
Temp

Select NXT (F1) to select Flow or Temperature and then press OK (F4).

20 mA = 3500 SCFM
CHG OK

F1 F2 F3 F4

Enter the value for the 20mA and press OK (F4) key to accept the setting. Then the following screen
will display:

Operation | 51
Model FT4X
Operation

4 mA = 0 SCFM
CHG OK

F1 F2 F3 F4

Enter the value for the 4mA and press OK (F4).

NOTE! When the flow rate exceeds the programmed value for the 20mA set point, the analog
output will stay at 20mA and an alarm code will be generated.

NOTE! 4mA is normally set to 0.

After setting the 4mA output value, choose the mA fault value:

mA Fault = Not use

NXT OK

F1 F2 F3 F4

This menu allows the user to select an alarm fault level on the 4-20mA output. The alarm is activated
when a serious issue is detected preventing the calculation of the correct flow rate. The 3.6mA and
21mA alarm outputs are related to the NAMUR NE 43 alarm feature.

The options are:

• mA Fault=3.6 mA (Force the 4-20mA signal to 3.6mA on alarm)
• mA Fault=21 mA (Force the 4-20mA signal to 21mA on alarm)
• mA Fault=Not use (4-20mA signal alarm fault not used)

The following events will set the output to 3.6mA or 21mA if the alarm level is selected:
• Sensor resistance above high limit
• Bridge Shutdown

Fig. 4.3: Range of 4-20mA Output and NAMUR Alarm

NAMUR Working Range NAMUR

Alarm Alarm
Range Normal Operation Range

Press (F4) repeatedly until “Normal Mode” is seen briefly to exit the programming mode.

Operation | 52
 Model FT4X
Operation

Pulse/alarm Output
The Pulse/alarm feature can be accessed from the Main Menu, press I/O (F1).

SET I/O
OUT INP EXIT

F1 F2 F3 F4

Press OUT (F1) to select the pulse output. The following screen will show:

OUT = Pulse
NXT OK

F1 F2 F3 F4

Press NEXT (F1) to cycle through output options until you have the selection for "OUT=Pulse" and
press OK (F4).

The pulse output can be configured in one of three ways:

1. Specifying how many pulses per unit, P/U (i.e., 10 pulses per SCF)
2. Specifying how many flow units total per pulse, U/P (i.e., 0.1 SCF per pulse)
3. Specifying a maximum frequency to a defined maximum value of flow rate

All of these approaches are equivalent.

PULSE OUTPUT
P/U U/P FEQ EXIT

F1 F2 F3 F4

Use P/U (F1) to enter pulse per unit, U/P (F2) for unit per pulse or FEQ (F3) to enter the flow and
maximum frequency to scale the pulse/alarm output.

NOTE! When data is entered with any of the three described methods, the other values will
be re-calculated according to the settings.

Entering data in Pulse per Unit:

From the Pulse/alarm Output Menu above, press P/U (F1) and the following screen will show:

PLS/UNT = 2
CHG OK

F1 F2 F3 F4

Press CHG (F1) to change the setting and then OK (F4) to accept entry.

The value entered is in pulse per selected flow unit total (i.e., 2 pulses per SCF).

Operation | 53
Model FT4X
Operation

Entering data in Unit per Pulse:

From the Pulse/alarm Output Menu, press U/P (F2) and the following screen will show:

UNT/PLS = 0.5
CHG OK

F1 F2 F3 F4

Press CHG (F1) to change the setting and then OK (F4) to accept entry.
The value entered is in unit per pulse (i.e. 0.5 flow unit total per pulse)

Entering data with flow and maximum frequency:

From the Pulse/alarm Output Menu, press FEQ (F3) and the following screen will show:

MaxFreq=100 Hz
CHG OK

F1 F2 F3 F4

Enter the maximum pulse rate (frequency) and press OK (F4).

CAUTION! Maximum pulse rate (frequency) cannot exceed 100 Hz.

The next screen will show:

MaxFlo=5000 SCFM
CHG OK

F1 F2 F3 F4

NOTE! If the flow rate exceeds the maximum pulse rate (frequency), the output will stay at
100 Hz and the FT4X will issue an alarm code.

Alarm Output
To access the Pulse/alarm feature, press I/O (F1) key from the Main Menu screen. The screen will
show:

SET I/O
OUT INP EXIT

F1 F2 F3 F4

Then press OUT (F1) and the screen may show:

Operation | 54
 Model FT4X
Operation

OUT = HiFloAlm
NXT OK

F1 F2 F3 F4

Then press NXT (F1) to select the correct alarm and press OK (F4).
Selections are:
Not used
Pulse
HiFloAlm = High Flow Alarm
LoFloAlm = Low Flow Alarm
HiTempAlm = High Temperature Alarm
LoTempAlm = Low Temperature Alarm
System Alarm

When the output is set to Alarm and there is no alarm condition, the output will be on (0 volts). When
an alarm is active, the output is turned off (12 to 24 volts).

HiFloAlm=500 SCFM
CHG OK

F1 F2 F3 F4

Enter the value for the limit by pressing CHG (F1) and then OK (F4). A value of 0 disables the alarm.

NOTE! There is only one output to operate as a pulse output or an alarm output. Both
cannot operate at the same time.

For Switch Input Settings:

From the Main Menu, press I/O (F1) and then I/O (F1) and then INP (F2) key to select input. The
following menu will display:

INP=Not Used
NXT OK

F1 F2 F3 F4

Press NXT (F1) until the correct selection is shown and then press OK (F4) to accept the setting.
Selections are:
Not used
Tot Reset = Reset the totalizer

Press EXIT (F4) repeatedly until you exit programming mode.

Operation | 55
Model FT4X
Operation

Serial Communication Settings

If a communication feature was purchased, the Serial communication settings can be programmed by
pressing I/O (F1) key from the Main Menu. The screen will show:

I/O MENU
I/O COM 420 EXIT

F1 F2 F3 F4

Press COM (F2) to select Serial communication.

The screen may show:

Comm=Modbus
NXT OK

F1 F2 F3 F4

Options for serial communication are:

None
Modbus
HART

NOTE! Any selection other than “None” requires the communication option for the selected
communication type. If enabling a communication option, see the Communications
Protocols section of this manual.

Display Setup
There are four display screens that you can cycle through in normal operating mode (see Figure 4.2
on p. 49). Two of the four display screens are fixed and cannot be changed (Display 3 and Display
4). The other two screens are programmable to show the information that you prefer and is discussed
in this section.

Display #1 Display #2
DSP1L1 DSP2L1
DSP1L2 DSP2L2

F1 F2 F3 F4 F1 F2 F3 F4

Selections are:
DSP1L1 = Display 1, Line 1
DSP1L2 = Display 1, Line 2
DSP2L1 = Display 2, Line 1
DSP2L2 = Display 2, Line 2

Operation | 56
 Model FT4X
Operation

To Program Display Screens #1 & 2:

From the Main Menu press DSP (F3) to select the display menu:

DISP/TIME/PSW
DSP LOG PSW EXIT

F1 F2 F3 F4

Press DSP (F1) key. The display will show:

DSP1L1 = Flo rate

NXT OK

F1 F2 F3 F4

These are the selections for the Display 1, Line 1.

Selections are:
Flo rate = Flow rate
Total = Total mass or volume
Elps = Elapsed time
Temp = Temperature
Alarm = Error codes

When the selection is correct, press OK (F4) to accept. The display will then go through the same
process for all 4 lines of the 2 programmable displays (DSP1L1, DSP1L2, DSP2L1 and DSP2L2).
After the last line of Display 2 is accepted, the display will show the following menu:

ALTERNATE = Off
NXT OK

F1 F2 F3 F4

This menu allows you to alternate between menu display 1 and 2 every few seconds.
Selections are: On or Off

Press OK (F4) to accept selection. Press EXIT (F4) repeatedly until “Normal Mode” is seen briefly to
exit the programming mode.

Reviewing and Enabling Date/Time for 24 Hour Logs and Contract Time:
The 24-Hour Log should be enabled and set to the local date/time at the commission site to make
full use of the Logs feature on the FT4X. The Contract Time setting allows the user to specify the start
time for recording daily flow totals.

DISP/TIME/PSW
DSP LOG PSW EXIT

F1 F2 F3 F4

Operation | 57
Model FT4X
Operation

Press LOG (F2) key to turn on or off the 24 Hour Log and perform a Date/Time review.

24 Hour log=On
NXT OK

F1 F2 F3 F4

Selections are: On or Off

To review the date and time settings, press NXT (F4).

Date/Time Review
NXT

F1 F2 F3 F4

Date/time settings will be displayed as a 24-hour clock (military time) format: HH:MM:SS.

MM/DD/YY HH:MM:SS
CHG NXT

F1 F2 F3 F4

If the date and time are correct, the 24 Hour Log will be turned on or off by pressing NXT (F1). If the
date and time are incorrect, the values can be changed and set by choosing CHG (F1) and following
instructions in the next section.

Programming the Date/Time for 24 Hour Logs and Contract Time:

The following screens will cycle through Year, Month, Day, Hour, Minute, and Seconds. Press CHG (F1)
to set the year value using the last two numerals (2020 = 20, 2021 = 21):

Year Set = YY
CHG OK

F1 F2 F3 F4

Press OK (F4) to set the value for year.

Press CHG (F1) to set the month value 1-12 (January = 1, October = 10):

Month Set = MM
CHG OK

F1 F2 F3 F4

Press OK (F4) to set the month value. Press CHG (F1) to set the day value 1-31:

Operation | 58
 Model FT4X
Operation

Day Set = DD
CHG OK

F1 F2 F3 F4

Press OK (F4) to set the day value. Next press CHG (F1) to set set the hour value 00-23:

Hour Set = HH
CHG OK

F1 F2 F3 F4

Press OK (F4) to set the hour value. Next press CHG (F1) to set the minute value 00-59:

Min Set = MM
CHG OK

F1 F2 F3 F4

Press OK (F4) to set the minute value. Next press CHG (F1) to set the second value 00-59:

Sec Set = SS
CHG OK

F1 F2 F3 F4

Press OK (F4) to set the second value.

To set all final values, choose YES (F1) or start over by choosing NO (F4):

Set Date/Time?
YES NO

F1 F2 F3 F4

The screen will show:

MM/DD/YY HH:MM:SS
CHG OK

F1 F2 F3 F4

Press OK (F4) to set the 24-Hour Clock as displayed and move to the Contract Time menu.

Operation | 59
Model FT4X
Operation

NOTE! Contract Time will only be set if the 24 Hour Log has been selected to be "On".

The following screens will cycle through hour and minute to set the Contract Time in the 24-Hour
Clock format: HH:MM.

Contr time = HH:MM

CHG OK

F1 F2 F3 F4

To accept the listed Contract Time, choose OK (F4). To change and set the value of the Contract Time,
press CHG (F1). First set the hour value 00-23:

Contr.Hour = HH
CHG OK

F1 F2 F3 F4

Press OK (F4) to set the hour value. Next press CHG (F1) to set the minute value 00-59:

Contr.Min = MM
CHG OK

F1 F2 F3 F4

Press OK (F4) to set the minute value. To set the final value, choose YES (F1) or NO (F4):

Set Contr Time?

YES NO

F1 F2 F3 F4

The Contract Time will be displayed.

Contr time = HH:MM

CHG OK

F1 F2 F3 F4

Press OK (F4) to exit to the Display Menu.

Password
There are two user level passwords, only Level 1 is programmable and gives access to all the normal
settings. The second password is used to allow access to calibration settings.

Default Level 1 password is “1234”, and Level 2 password is “9111”. The Level 1 programmable
password can be disabled by setting it to “0”.

Operation | 60
 Model FT4X
Operation

To Program the Password:

From the Main Menu press DSP (F3) to select the display menu.

DISP/TIME/PSW
DSP LOG PSW EXIT

F1 F2 F3 F4

Press PSW (F3) key to select password.

PASSWD = 1234
CHG OK

F1 F2 F3 F4

This screen displays the current Level 1 password.

Press CHG (F1) key to change the password and enter new value.

Press OK (F4) to accept new data and exit programming by pressing EXIT (F4) key repeatedly until
out of the programming mode.

NOTE! Password can be number or letter characters up to 4 digits.

Units Settings Menu

This menu is used to set the units for flow, temperature, and pressure as well as the setting of
reference temperature and reference pressure.

These values will be set at Fox Thermal using information supplied by the customer. These values can
be changed to match a new application. The units setting is accessed from the Main Menu. To access
the Unit Settings Menu:

MAIN MENU
I/O FLO DSP EXIT

F1 F2 F3 F4

Press FLO (F2):

FLOW MENU 1
DGN UNT FM2 EXIT

F1 F2 F3 F4

Press UNT (F2) for Unit selection.

Operation | 61
Model FT4X
Operation

The screen will show:

FLO UNT = SCFM

NXT OK

F1 F2 F3 F4

Press NXT (F1) to change selection and OK (F4) to accept.

NOTE! The totalizer (total flow measured) will roll over when reaching a certain value. The
maximum value is dependent on the flow units selected (see Totalizer Rollover p. 69).

Flow Units
Selections for flow units are:
SCFM KG/M LBS/D SM3/H MSCFD (MCFD)
SCFH KG/S NLPH SM3/D MMSCFD (MMCFD)
NM3/H LBS/H NLPM NM3/D MCFD (MSCFD)
NM3/M LBS/M NLPS SLPM MMSCFM (MMCFM)
KG/H LBS/S SM3/M SCFD MT/H

WARNING! Changing the flow units will automatically recalculate the 4-20mA range values,
the Pulse Output maximum flow, and the flow cutoff. The Pipe ID will change between inches
and millimeters to match Imperial vs Metric flow rates.

Temperature Units
After pressing OK (F4) to accept the Flow unit, the display will prompt for the temperature unit
setting:

TMP UNT= ° F
NXT OK

F1 F2 F3 F4

Press NXT (F1) to change selection and OK (F4) to accept.

Selections for Temperature units are: °C or °F

NOTE! To adjust the scaling of the 4-20mA temperature output after changing the
temperature units, reference p. 51.

Reference Temperature
After pressing OK (F4) to accept the temperature unit setting, the display will prompt for temperature
reference in selected unit.

Operation | 62
 Model FT4X
Operation

TmpRef = 60 °F
CHG OK

F1 F2 F3 F4

Press CHG (F1) to change the reference and OK (F4) to accept.

Pressure Units
After pressing OK (F4) to accept the reference temperature, the display will prompt for the reference
pressure unit selection:

PRES UNT= Psia

NXT OK

F1 F2 F3 F4

Press NXT (F1) to select next entry and OK (F4) to accept.

Selections are:
mmHG = Millimeters of mercury (absolute)
Psia = Pounds per square inch absolute
bara = Bar absolute

Reference Pressure
After the pressure unit selection is made, the display will show a menu to enter the reference pressure:

PresRef= 14.7
CHG OK

F1 F2 F3 F4

Press CHG (F1) to change it and OK (F4) to accept.

Accessing Flow Parameters and Alarm Settings

This is the menu used to set various flow parameter values. They are: Flow cutoff, pipe diameter, filter,
high and low alarm for flow and temperature.

NOTE! The parameters in this menu are set to the customer specifications at the factory. They
should only be changed when changing the application of the flow meter.

MAIN MENU
I/O FLO DSP EXIT

F1 F2 F3 F4

The menu is accessed from the Main Menu by pressing FLO (F2):

Operation | 63
Model FT4X
Operation

FLOW MENU 1
DGN UNT FM2 EXIT

F1 F2 F3 F4

Then press FM2 (F3):

FLOW MENU 2
GAS SPC PRM EXIT

F1 F2 F3 F4

NOTE! The SPC function key will only appear and be accessible from a Level 2 password.

Then press PRM (F3). This will move into settings for flow cutoff, pipe diameter, and filter value.
These settings will be followed by the high and low alarm settings for flow rate and/or temperature.

Programming Flow Parameters

Flow Cutoff
The first parameter is Flow Cutoff:

CUTOFF = 2.0 SCFM

CHG OK

F1 F2 F3 F4

Enter the value for the flow cutoff and then press OK (F4). When the flow rate falls below the flow
cutoff, the flow meter will display a flow value of zero.

Pipe Diameter
To set the pipe diameter, enter the pipe diameter in inches or millimeters and then press OK (F4).

Pipe_id = 3.068 In
CHG OK

F1 F2 F3 F4

Use millimeters for metric flow unit selections and inches for English flow unit selections. This
selection is dependent on the flow unit selected (English vs metric). If the pipe/duct is a square or
rectangle, the hydraulic diameter (equivalent value for a round pipe) must be entered for the pipe ID.

Filter Value
The filter value is entered in seconds. The allowable time constant range is 0.8 to 10 seconds. The
filter time interval is proportional to the dampening.

Operation | 64
 Model FT4X
Operation

Enter the filter value and then press OK (F4).

FILTER = 0.8 sec

CHG OK

F1 F2 F3 F4

Programming High and Low Alarm Settings

Settings for the alarms directly follow the flow parameters for flow cutoff, pipe diameter, and filter
value. These alarms can be used without the digital output assigned to the alarm. If that is the case,
the alarm status will only be shown on the display, through serial communication, or FT4X View™. If
the digital output is assigned to an alarm, changing the value here will change that setting.

High Flow Rate Alarm

This is the upper flow limit alarm value that can be associated with the alarm output. An alarm code is
generated when the flow value exceeds this limit. If no alarm is needed, set this value to zero.

To set the parameters for a high flow rate alarm, press CHG (F1):

HiFloAlm = 1234 SCFM

CHG OK

F1 F2 F3 F4

Press OK (F4) to accept the value.

Low Flow Rate Alarm

This is the lower flow limit alarm value that can be associated with the alarm output. An alarm code is
generated when the flow value is below this limit. If no alarm is needed, set this value to zero.

To set the parameters for a low flow rate alarm, press CHG (F1):

LoFloAlm = 100 SCFM

CHG OK

F1 F2 F3 F4

Press OK (F4) to accept the value.

High Temperature Alarm

This is the upper temperature limit alarm value that can be associated with the alarm output. An
alarm code is generated when the temperature value exceeds this limit. If no alarm is needed, set this
value to zero.

To set the parameters for a high temperature alarm, press CHG (F1):

Operation | 65
Model FT4X
Operation

HiTmpAlm = 200 F
CHG OK

F1 F2 F3 F4

Press OK (F4) to accept the value.

Low Temperature Alarm

This is the lower temperature limit alarm value that can be associated with the alarm output. An
alarm code is generated when the temperature value is below this limit. If no alarm is needed, set this
value to zero.

To set the parameters for a high temperature alarm, press CHG (F1):

LoTmpAlm = 20 F
CHG OK

F1 F2 F3 F4

Press OK (F4) to accept the value.

Simulation
This menu allows for simulation of flow rate and temperature. It should only be used for testing
and demonstration purposes. Make sure to return all of these simulation values to zero, before
returning to the normal mode of operation.

CAUTION! If the 4-20mA and/or the pulse/alarm outputs are connected to controllers, set
the controllers to “manual” to ensure that the simulated signals do not cause false controller
action.

The menu is accessible from the Main Menu by pressing FLO:

FLOW MENU 1
DGN UNT FM2 EXIT

F1 F2 F3 F4

Pressing DGN (F1) will show:

DIAGNOSTIC
SIM CAL-V EXIT

F1 F2 F3 F4

Pressing SIM (F1) will show:

Operation | 66
 Model FT4X
Operation

Simulate Flow?
YES NO

F1 F2 F3 F4

Press YES (F1) to continue.

FloSim = 0 SCFM
CHG OK

F1 F2 F3 F4

Enter the value and then press OK (F4).

NOTE! Enter zero to disable this feature.

Simulate Temp?
YES NO

F1 F2 F3 F4

Press YES (F1) to continue.

TmpSim = 0 C
CHG OK

F1 F2 F3 F4

Enter the value and then press OK (F4). Enter zero to disable this feature.

ENABLE SIM?
YES NO

F1 F2 F3 F4

Press YES (F1) to start the simulation mode, otherwise press NO (F4). Upon pressing either key, the
program will return to the FLOW MENU 1 screen.

NOTE! Simulation Mode will be cleared if the power is cycled.

K Factor
The K Factor allows the user to adjust the meter’s calibration. The Fox Thermal flow meter increases
the calculated flow rate by the K Factor. This results in a direct scaling of the meter’s output across the
entire full range.

Operation | 67
Model FT4X
Operation

The K Factor parameter is accessed from the “Flow Menu 2” menu by entering a Level 2 password
“9111” and pressing the SPC key (F2).

FLOW MENU 2
GAS SPC PRM EXIT

F1 F2 F3 F4

The following screen will be displayed:

K fact=0%
CHG OK

F1 F2 F3 F4

Press CHG (F1). Add the correction factor and press OK (F4).

If you want the flow meter to read 5% higher, enter 5.0%.

If you want the flow meter to read 5% lower, enter -5.0%.
If an existing K Factor is present, add the additional K Factor to the existing value.

Upon pressing OK (F4), an option to restore the database will follow.

Restore Database
In case of user error, the ability to restore the meter to the original factory settings can be achieved in
this menu. The display will show:

RESTORE DATABASE?
YES NO

F1 F2 F3 F4

Press YES (F1) ONLY if you want to restore your database to the initial factory settings that the meter
was shipped with. All current user-entered settings will be overwritten. The green LP3 LED will flash at
a faster pace until the recall is performed.
Upon pressing OK (F4), an option to reset CRC will follow.

Reset CRC
If the NVRAM CRC check fails (Error Code 36), the programmed settings values will need to be verified
and corrected before clearing the error. Call Fox Thermal Customer Service if you need assistance.

RESET CRC?
YES NO

F1 F2 F3 F4

Press YES (F1) ONLY if you want to reset the CRC and generate a new CRC value.

Operation | 68
 Model FT4X
Operation

Reset Total and Elapsed Time

Enter the flow totalizer and elapsed time screen by pressing the F3 and F4 keys at the same time in
the normal running mode.

RESET TOTAL ?
NO YES

F1 F2 F3 F4

Press YES (F4) and enter password to reset total and elapsed time. Press NO (F1) to cancel.

NOTE! This feature is not available on non-resettable units.

Totalizer Rollover: The FT4X has an automatic roll-over function. The total flow count of the FT4X
will roll over after 99,999,999,999. Except for:
MSCFD: 999,999,999
MMSCFM: 9,999,999
MMSCFD: 999,999

Calibration of the Fox Thermal Model FT4X Thermal Flow Meter

To ensure that all Fox Thermal flow meters meet specified performance parameters and
provide accurate, repeatable measurements in the field, all calibrations are performed with
NIST-traceable flow standards. Each meter is shipped from the factory with a Fox Thermal
Calibration Certificate.

Calibration Validation
Calibration Validation allows customers to validate the accuracy and functionality of the meter
in the field with a push of a button. By performing a simple test, the operator can verify that
the meter is running accurately.

CAL-V Calibration Validation Test

Fox Thermal has developed the CAL-V™ Calibration Validation test to help our customers avoid
sending the meter back for annual or biennial recalibration.

CAL-V™ ensures the repeatability, functionality of the sensor and its associated signal
processing circuitry, and cleanliness of the sensor.

During the CAL-V™ calibration validation test, the microprocessor adjusts current to the
sensor elements and determines the resulting electrical characteristics. Data within established
tolerances confirms the meter is accurate.

Recommended Conditions for Performing CAL-V™ Test

Fox Thermal recommends the CAL-V™ test be run under flowing conditions, especially in
smaller pipe sizes. If the CAL-V™ test does not produce a "PASS" result, refer to "CAL-V™ Test Results"
on page 71.

Operation | 69
Model FT4X
Operation

NOTE! If the CAL-V™ test is performed using the Fox Thermal FT4X View™ Software, at the
completion of the test, a CAL-V™ Certificate may be printed for a record of the test. This
certificate will display a pass/fail result.

Performing the CAL-V™ Calibration Validation Test

Press FLO (F2) from the Main Menu. The display will show:

FLOW MENU 1
DGN UNT FM2 EXIT

F1 F2 F3 F4

Press DGN (F1). The display will show:

DIAGNOSTIC MENU
SIM CAL-V EXIT

F1 F2 F3 F4

Press CAL-V (F2). The display will show:

CAL-V MENU
VER EXIT

F1 F2 F3 F4

Press VER (F1) to perform the CAL-V™ verification test.

VERIFY CAL-V?
YES NO

F1 F2 F3 F4

Press YES (F1) to continue.

Flo:Hold value
NXT EXIT OK

F1 F2 F3 F4

Press NXT (F1) to toggle between "Hold value" and "Go to zero". During the CAL-V™ test, "Hold
value" will keep the 4-20mA and pulse outputs at the last value measured. "Go to zero" will set the
flow 4-20mA and pulse outputs to the equivalent of zero flow. Press OK (F4) to continue with the
CAL-V™ test.

Operation | 70
 Model FT4X
Operation

Take Control
off-line EXIT OK

F1 F2 F3 F4

When ready to begin the test, press OK (F4).

Verifying CAL-V
y.yyy T=xx

F1 F2 F3 F4

This test takes about 3 minutes (200 seconds). During the test, the display will show the CAL-V™ value
changing as the power to the sensor is adjusted. "T=xx" is a CAL-V™ timer indicating how much time
is left to finish the test.

CAL-V™ Test Results

Upon test completion, the final CAL-V™ value will be displayed along with a Pass, Fail, or Warning
message:
• Pass: less than ±0.80
• Warning: between ±0.80 to ±1.0
• Fail: greater than ±1.0

Recommended next steps if a "Warning" or "Fail" result is displayed:

• Run the test again under a higher flow rate if possible.
• Remove the probe from the pipe, clean the sensor, and perform the test again under a normal or
high flow rate.

If a "Warning or "Fail" result is displayed after repeating the test, please call Fox Thermal Service at
(831) 384-4300 for assistance.

CAL-V = 0.251
Pass OK

F1 F2 F3 F4

Press OK (F4) to exit the menu when the test is complete.

NOTE! The FT4X will stop measuring flow when performing this test.

CAUTION! For applications with temperature exceeding 250°F (121°C), CAL-V™ test results
may vary. Periodic inspection for damage and cleaning of the sensor elements is required.

Operation | 71
Model FT4X
Operation

Gas-SelectX® Available Gases and Gas Mix Menus

This menu allows the user to select a gas or gas mix from a list of gases/gas mixtures available in
the Fox Thermal model FT4X flow meter. When entering the FT4X gas menu the user will have three
choices:
1. Pure Gas Menu - list of 14 gases
2. Gas Mix (MIX) - any combination of the gases in the Mixed Gas menu (total must equal 100%)
3. Oil & Gas Mix (O&G) - any combination of the 14 gases in the Oil & Gas menu (total must equal
100%)
Pure Gas Menu Mixed Gas Menu** O & G Gas Menu**
Air Methane Pentanes **** Methane (C1)
Argon Carbon Dioxide Hexanes **** Ethane (C2)
Butane Nitrogen Heptanes **** Propane (C3)
Carbon Dioxide Helium Octanes **** i-Butane (C4)
Methane Argon Nonanes+ **** n-Butane (C4)
Natural Gas * Hydrogen Pentanes (C5)
Nitrogen Air Hexanes (C6)
Oxygen Propane Carbon Dioxide (CO2)
Helium Butane Nitrogen
Hydrogen Oxygen Heptanes (C7)
Ethane Ethane Octanes (C8)
Propane Ethylene Nonanes+ (C9+) ***
Ethylene Propylene Ethylene
Propylene i-Butane **** Propylene
*Natural gas is defined as the NAESB Natural Gas mix (94.9% Methane, 0.7% CO2, 1.6% N2,
0.3% Propane, and 2.5% Ethane).
** The molar percentages of the gases are programmable in 0.1% increments. Gases may
be mixed in any proportion equaling 100%. Round compositions to the nearest 0.1 percent;
rounding errors to be added/subtracted to Hexanes (C6).
*** Total of all gases C9 & greater (C9+).
****Only available on FT4X with firmware v8.3 or later.

NOTE! For the latest gas and gas mix menu, visit the Fox Thermal Website:
www.foxthermal.com

After installing your FT4X flow meter, power up the device. When the meter finishes initializing, it will
begin to monitor flow in the assigned gas and flow units.

Accessing the Gas-SelectX® Gas Selection Menu Feature

Enter the programming mode on the meter (refer to p. 50) and then follow these instructions to
access the Gas-SelectX® feature:

Operation | 72
 Model FT4X
Operation

MAIN MENU
I/O FLO DSP EXIT

F1 F2 F3 F4

Press FLO (F2) from the Main Menu to enter Flow Menu 1.

FLOW MENU 1
DGN UNT FM2 EXIT

F1 F2 F3 F4

Press FM2 (F3) to get to Flow Menu 2.

FLOW MENU 2
GAS SPC PRM EXIT

F1 F2 F3 F4

Press GAS (F1) to access the Gas-SelectX® feature. The display will show the gas setting (Pure Gas,
Mix, or O&G Mix):

GAS=O&G Mix
NXT OK

F1 F2 F3 F4

Press NXT (F1) repeatedly until the correct selection is shown and then press OK (F4) to accept the
setting.
Selections are: Pure Gas
Mix
O&G Mix

In the Pure Gas menu, the user can choose from a list of pure gases. The Mix menu is used for
programming a specific mixture of gases. The O&G Mix menu is used for programming a specific
mixture of common gases found in the Oil & Gas industry.

NOTE! Switching between Pure Gas, Mix, or O&G Mix settings will clear the previous gas
settings.

See previous pages for gases available in each menu.

Operation | 73
Model FT4X
Operation

Gas-SelectX® Single Gas Menu

To select a pure gas, choose "Pure Gas" (F1) and then press "OK" (F4) to accept the setting:

GAS=Air
NXT EXIT

F1 F2 F3 F4

To choose any pure gas, press NXT (F1) to cycle through until the correct gas is displayed and press
OK (F4) to select the gas. "Gas-SelectX® Available Gases and Gas Mix Menus" on page 72.

Choosing a Gas: Gas Mix Menu and Oil & Gas Menu
To create a gas mix, choose either "Mix" or "O&G Mix" from the GAS menu.

GAS =Mix
NXT OK

F1 F2 F3 F4

The screen will show the first gas available in the menu:

Methane=0%
CHG OK

F1 F2 F3 F4

This screen shows the percentage of the gas mixture allocated to Methane. In this case, it shows 0%.
To program the specific mixture of Methane, press CHG (F1).

Methane=30.5%
UP DN NXT OK

F1 F2 F3 F4

To set the percentage of methane in the gas mix, press UP (F1) or DN (F2) to choose the first digit
of the percentage. Press NXT (F3) to move to the next digit in the percentage and then use UP (F1)
or DN (F2) again to choose the next digit of the percentage. Once the desired methane percentage
is displayed, press OK (F4). The display will move to the view of the concentration of each of the
subsequent list of gases.

Ethane=0%
CHG OK

F1 F2 F3 F4

Operation | 74
 Model FT4X
Operation

Once the desired gas percentages are programmed, press OK (F4). One of the following messages
will appear:

Gas Mix (100%) Err: Mix=(110%)

-or- CHG
CHG OK

F1 F2 F3 F4 F1 F2 F3 F4

If the gas mix does not equal 100%, press CHG (F1) to return to the gas entry menu.

Once the "Gas Mix (100%)" message appears, you have successfully programmed the gas mix in Gas-
SelectX® and can exit. Press OK (F4) to set the mixture.

After the gases are programmed, the FT4X will begin to monitor flow based on the algorithm for the
gas/gas mix selected in the Gas-SelectX® feature. The screen will show the flow in units and the total
flow similar to the example below:

1162.52 SCFM
Tot=6205012.50 SCF

F1 F2 F3 F4

In normal operating mode, the gas selection can be seen on display 3 (see p. 49).

NOTE!
• Gas mix must equal 100%
• Any gases not included in the gas mix should have percentages set to 0%.
• The entry for Nonane+ in the Oil and Gas menu includes all hydrocarbon gases
C9 and higher.

Operation | 75
Model FT4X
Logs

Logs Introduction
The data logger is internal to the model FT4X flow meter, includes extra memory, and has a battery-
backed real-time clock (RTC). The RTC maintains accurate time when power is off to the flow meter.
The battery has a life expectancy exceeding 10 years. Logs are the data/files maintained in the FT4X
flow meter memory. Logs can be viewed by the user without entering a password. To access the Logs
menu and view data press F1 and F2 on the front FT4X front panel simultaneously.

The following data is viewable in the Logs menu:

• 40 daily totals (24-hour flow totals) based on Contract Time (isolated start time for recording
daily flow total) set by the user.
• Local date and time set by the user.
• Current gas composition programmed into the meter.
• Current flow meter configuration and meter settings.
• Engineering data including non-resettable power-off totalizer.

The following is only available by download by using the FT4X View™ Software:
• Date/time stamped power off and power on events.
• Event/alarm logs with date/time stamps including all changes in flow meter settings (i.e.
4-20mA, pipe size, changes to gas composition) and date/time stamped alarms (i.e. meter self-
diagnostic alarms, out of user set flow or temperature limits, power on/power off events).

NOTE! To change flow meter settings or run the CAL-V™ calibration validation test the user
must enter the password-protected Set Parameter menu.

NOTE! The totalizer time counter is not related to the 40 24-hour totals. The totalizer and
elapsed time counter run until reset. The elapsed time counter is the number of hours since
the totalizer was reset. The totalizer and elapsed time counter do not increment when the flow
meter power is off.

24-hour Log
• Total number of records possible: 40
• Frequency of data being logged: once per day

Configuration change, Events, and Alarms Log

• Total number of records possible: 5000
• Frequency of data being logged: the change or event is logged when it is detected. Note that
a "Power OFF" event is not written until the meter is powered on, at which time a "Power ON"
event is also written

BLM Log
• Total number of records possible: 412,876
• Each record contains date & time (6 bytes), type (1 byte), average hourly flow (4 bytes), average
hourly temperature (4 bytes), and total flow for the hour (4 bytes). One byte is reserved.
• Frequency of data being logged: once per hour

Logs | 76
 Model FT4X
Logs

Displaying Data Log Records

From the normal operating mode, press F1 & F2 keys at the same time:

LOGS MENU1
LOG TOT ENG EXIT

F1 F2 F3 F4

LOG (F1) will enter the Logs Menu 2:

• The Gas or Gas Mix can be viewed here
• The Meter's configuration settings can be viewed here
• The most recent CAL-V™ Calibration Validation record can be viewed here

TOT (F2) will enter the 40 24-Hour Daily Totals log.

• Each of the 40 24-Hour Daily Totals can be reviewed

ENG (F3) will enter the Engineering Screens.

• The Engineering screens show information about alarm settings, serial numbers, firmware
versions, CSV, and output information

Viewing the Gas/Gas Mix

From the Logs Menu 1, choose LOG (F1) to enter Logs Menu 2:

LOGS MENU2
GAS CFG VAL EXIT

F1 F2 F3 F4

Press GAS (F1) to view the current gas, gross heating value, and density. If a pure gas is chosen, the
gas will be listed with a value of 100%. If a gas mix or O&G gas mix have been chosen, the screen will
show either 'Mix' or 'O&G Mix':

Methane 100% Gas=Mix Gas=O&G Mix

OK OK OK

F1 F2 F3 F4 F1 F2 F3 F4 F1 F2 F3 F4

With 'Mix' and 'O&G Mix', each subsequent screen will display the values of each possible gas menu
component with their percentage value (even if the gas is set to 0%):

Air%= 0.0 Methane%= 45.0

NXT PRV EXIT NXT PRV EXIT

F1 F2 F3 F4 F1 F2 F3 F4

Press NXT (F1) to view the next gas in the menu. Press PRV (F2) to view the previous gas. Press EXIT

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Logs

(F4) to go back to Logs Menu 2.

Once the composition of the gas has been viewed, the gross heating value will be displayed:

1014.1 BTU/Ft3
NXT PRV EXIT

F1 F2 F3 F4

Press NXT (F1) to view the gas density:

DNS=0.6800 Kg/M3
PRV EXIT

F1 F2 F3 F4

Press EXIT (F4) to go back to Logs Menu 2.

Viewing the Meter's Configuration

The meter's configuration settings include the flow units, temperature units, pressure units, 4-20mA
output settings, alarm settings, reference pressure, reference temperature, K-Factor, flow cutoff, pipe
ID, filter, the meter's serial number, the firmware version, and the release date of the meter's firmware.

NOTE! If any of these settings are to be changed, the operator must enter the programming
mode with a password. See the Operation section of this Manual for further details on
programming the meter's settings.

From the Logs Menu 1, choose LOG (F1) to enter Logs Menu 2:

LOGS MENU 1
LOG TOT ENG EXIT

F1 F2 F3 F4

From the Logs Menu 2, choose CFG (F2) to view the meter's validation screens.

LOGS MENU 2
GAS CFG VAL EXIT

F1 F2 F3 F4

The first screen will display the flow meter's flow unit setting. In this case, SCFM:

Flow: SCFM
NXT PRV EXIT

F1 F2 F3 F4

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Logs

Press NXT (F1) to view the next setting in the log. Press PRV (F2) to move back to the previous
setting. Press EXIT (F4) to go back to Logs Menu 2.

Viewing the Most Recent Calibration Validation Test Data

The meter's display will show the two (2) most recent logs of data for the CAL-V™ Calibration
Validation tests that were performed on the meter.

From the Logs Menu 2, choose VAL (F3) to view the meter's configuration screens.

LOGS MENU 2
GAS CFG VAL EXIT

F1 F2 F3 F4

The most recent test value data will be displayed first:

CAL-V=0.1
NXT PRV EXIT

F1 F2 F3 F4

Press NXT (F1) to view the most recent CAL-V™ test result:

CAL-V=Pass
NXT PRV EXIT

F1 F2 F3 F4

A 'Pass', 'Warning', or 'Fail' message will be displayed. Press NXT (F1) to view the previous test's data.
The previous test value data will be displayed next:

P CAL-V=-0.14
NXT PRV EXIT

F1 F2 F3 F4

Press NXT (F1) to view the previous CAL-V™ test result:

P CAL-V=Pass
NXT PRV EXIT

F1 F2 F3 F4

A 'Pass', 'Warning', or 'Fail' result will be displayed. Press EXIT (F4) to return to Logs Menu 2.

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Viewing 24-Hour Daily Totals

From the Logs Menu 1, choose TOT (F2) to enter the 24-hour Daily Total Log:

LOGS MENU1
LOG TOT ENG EXIT

F1 F2 F3 F4

The first screen will show the most recent, Day 1 total:

Day1=0SCF
NXT PRV EXIT

F1 F2 F3 F4

Pressing F1 will display the next 24 hour record, Day 2 Total, F2 will display the previous record.

Press F4 to exit to the normal mode at any time.

NOTE! The data logger supports 40 flow total records, Day 1 being the latest recorded value
and Day 40 being the oldest.

Resetting Total
To reset the total, you must exit the Logs and start from the normal operating mode. Refer to "Reset
Total and Elapsed Time" on page 69 for instructions on how to reset the total.

NOTE! Resetting the total will not affect the data logger's 40 24-hour totals.

Viewing the Engineering Screens

From the Logs Menu 1, choose ENG (F3) to enter the Engineering Screens.

LOGS MENU1
LOG TOT ENG EXIT

F1 F2 F3 F4

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There are ten (10) screens (10-19) to view meter data:

• Screen 10 - flow rate measured by the meter, CSV of the sensor measurement circuit.
• Screen 11 - digital control counts of the pulse and 4-20mA outputs.
• Screen 12 - Elapsed time of meter operation and the status of meter operation.
• Screen 13 - active alarms and lists the firmware version of the meter.
• Screen 14 - serial numbers for the main and bridge boards
• Screen 15 - serial numbers for the meter and the sensor.
• Screen 16 - high and low flow alarm settings.
• Screen 17 - high and low temperature alarm settings.
• Screen 18 - total number of power cycles, number of errors in total flow measurement.
• Screen 19 - most recent CAL-V™ value, elapsed time of meter powered off (in hours).

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Communications

Scope - Modbus Communication

This portion of the manual describes the Modbus implementation using RS485 serial communication
physical layer for the Fox Thermal FT4X mass flow meter based on the Modicon Modbus Protocol (PI-
MBUS-300 Rev. J).

Modbus Protocol
Modbus Protocol is an application layer messaging protocol that provides client/sever
communications between devices. Modbus is a request/reply protocol and offers services specified by
function codes.

The size of the Modbus Protocol Data Unit is limited by the size constraint inherited from the first
Modbus implementation on Serial Line network (max. RS485 Application Data Unit = 256 bytes).
Therefore, Modbus PDU for serial line communication = 256 – Server address (1 byte) – CRC (2 bytes)
= 253 bytes.

RS485 ADU = 253 + Server address (1 byte) + CRC (2 bytes) = 256 bytes.

For more information on Modbus go to the web site http://www.modbus.org/.

Command Request:
<Meter Address> <Function code> <Register start address high> <Register start address low>
<Register count high> <Register count low> <CRC high> <CRC low>

Command Response:
<Meter Address> <Function code> <Data byte count> <Data register high> <Data register
low> ... <Data register high> <Data register low> <CRC high> <CRC low>

NOTE! The data shown in brackets < > represents one byte of data.

Modbus Indicators
Green LED indicator LP3 cycles on and off to indicate that the FT4X is operating. Orange LED indicator
LP2 blinks when Modbus signals are received and yellow LP1 blinks when Modbus signals are
transmitted. The LEDs are located behind the display panel.

Modbus Function Codes Supported by the FT4X

The FT4X supports the following commands:
1) Command 03: Read multiple registers
2) Command 04: Read single register
3) Command 06: Write single register
4) Command 16: Write multiple registers (limited to gas percentage register pairs)

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Read Multiple Registers (command 03)

This command reads one or more 16-bit registers from the FT4X and has the following format:

Request:
<Meter Address> <Command code=03> <Register start address high> <Register start address
low> <Register count high> <Register count low> <CRC high> <CRC low>

Response:
<Meter Address> <Command code=03> <Byte count> <Data high><Data low> ... <Data
high><Data low> <CRC high> <CRC low>

Example: Request data register at starting address 0x0000 and specifying 2 registers

<0x01> <0x03> <0x00> <0x00> <0x00> <0x02> <0xC4> <0x0B>

Response:
<0x01> <0x03> <0x04> <xx> <xx> <xx> <xx> <CRC high> <CRC low>

Where xx xx is the data register value.

Table 5.1: FT4X Modbus Registers

Modbus Data Type Description Units
Register
40001 32-bit int LSW Flow User selected
40002 32-bit int MSW
40003 32-bit int LSW Flow Total User selected
40004 32-bit int MSW
40005 32-bit int LSW Temperature x10 Tenths of user selected
40006 32-bit int MSW
40007 32-bit int LSW Elapsed time x10 In Hours
40008 32-bit int MSW
40009* 16-bit int Firmware version x10 (scaled up for 16-bit format)
40010 Reserved
40011 16-bit int Flow x 10 (flow scaled for 16-bits) Tenths of user selected
40012 16-bit int Flow x 100 (flow scaled for 16-bits) Hundredths of user selected
40013 16-bit int Total x 100 (flow total scaled for 16-bits) Hundredths of user selected
40014* 32-bit float LSW Gross Heating Value (GHV) BTU/Ft3
40015* 32-bit float MSW
40016 16-bit int Status
40017 16-bit int Status 2

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Table 5.1: FT4X Modbus Registers (cont'd)

Modbus Data Type Description Units
Register
40018 16-bit int Control Register (write only): (integer format)
Reset Total = 2
Perform CAL-V = 173
Abort CAL-V = 174
Reset 24hr total log = 180
Generate 24 hrs event = 182
Read RTC clock = 186
40019* 16-bit int Model Status (Read only) 0x04
40020 32-bit float LSW Flow User selected
40021 32-bit float MSW
40022 32-bit float LSW Total User selected
40023 32-bit float MSW
40024* 32-bit float LSW Reference pressure User selected
40025* 32-bit float MSW
40026 32-bit float LSW Temperature User selected
40027 32-bit float MSW
40028 32-bit float LSW Elapsed time Hour
40029 32-bit float MSW
40030 32-bit float LSW Calibration validation result
40031 32-bit float MSW
40032 32-bit int LSW tot24 record selection Day
40033 32-bit int MSW
40034 32-bit float LSW tot24 selected record flow total User selected
40035 32-bit float MSW
40036 32-bit float LSW tot24 current day's flow total User selected
40037 32-bit float MSW
40038* 16-bit int Flow Unit Code (SCFM = 0, SCFH = 1, NM3_H = 2, User selected
NM3_M = 3, KG_H = 4, KG_M = 5, KG_S = 6, LBS_H = 7,
LBS_M = 8, LBS_S = 9, NLPH = 10, NLPM = 11, MMSCFD
= 15, LBS_D = 16, SLPM = 17, NLPS = 18, MSCFD = 19,
SM3_H = 20, MT_H = 21, NM3_D = 22, MMSCFM = 23,
SCFD = 24, MCFD = 25, SM3M = 26, SM3D = 27)
40039* 16-bit int Temp Unit Code (Degree F = 0, Degree C = 1) User selected
40040* 16-bit int Pressure Unit Code (MMHG = 0, PSIA = 1, BARA = 2) User selected
40041 to 40043 Reserved
40044 32-bit int LSW Reserved for Current time: year portion (last 2 digits) Year
40045 32-bit int MSW
40046 32-bit int LSW Reserved for Current time: month portion Month
40047 32-bit int MSW
40048 32-bit int LSW Reserved for Current time: day portion Day
40049 32-bit int MSW
40050 32-bit int LSW Reserved for Current time: hour portion Hour
40051 32-bit int MSW
40052 32-bit int LSW Reserved for Current time: minute portion Minute
40053 32-bit int MSW

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Modbus Data Type Description Units

Register
40054 32-bit int LSW Reserved for Current time: second portion Second
40055 32-bit int MSW
40197* 32-bit float LSW Gas Density STP KG/M3
40198* 32-bit float MSW
40199* 32-bit int LSW Meter Serial Number
40200* 32-bit int MSW
40201* 16-bit int ADC Status
40202* 32-bit float LSW Electronics Temperature Degrees Celsius
40203* 32-bit float MSW
40204* 16-bit int Last CAL-V Year Years
40205* 16-bit int Last CAL-V Month Month
40206* 16-bit int Last CAL-V Day Days
40207* 16-bit int Last CAL-V Hour Hours
40208* 16-bit int Last CAL-V Min Minutes
40209* 16-bit int Last CAL-V Sec Seconds
40210* 32-bit float LSW Last CAL-V Value
40211* 32-bit float MSW Last CAL-V Value

*These registers are only available on FT4X firmware v8.3 or later.

NOTES!
• In Least Significant Word (LSW) and Most Significant Word (MSW), “word” is one 16-bit
Modbus register. A 32-bit float or 32-bit integer is stored in a pair of Modbus registers.
When a register is designated as “32-bit int LSW”, it means bits 0-15 of the variable are in
that register. A register designated as MSW has bits 16-31 of the variable. For instance, the
flow total can be read as a 32-bit integer from registers 40003 (LSW) and 40004 (MSW). If
the flow total is 0x12345678, then register 40003 will hold 0x5678, and register 40004 will
hold 0x1234. See the layout of a 32-bit floating point value on p. 87.
• 32-bit floating point values are defined by the IEEE 754 standard: https://ieeexplore.ieee.
org/document/8766229
• Refer to Wikipedia: https://en.wikipedia.org/wiki/Single-precision_floating-point_format

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Read Single Register (Command 04)

This command is used to read a single 16-bit register and has the following format:

Request:
<Meter Address> <Command code=04> <Register address =0> <Register address =0> <Register
count =0> <Register count =1> <CRC high> <CRC low>

Response:
<Meter Address> <Command code=04> <Byte count =2> <Status High><Status Low> <CRC
high> <CRC low>

Table 5.2: Status Bits Definitions for Modbus Address 40016

Bit Definition Comment

0 Power up indication Cleared when out of the power up sequence

1 Flow rate reached high limit threshold Set limit to zero to disable

2 Flow rate reached low limit threshold Set limit to zero to disable

3 Temperature reached high limit threshold Set limit to zero to disable

4 Temperature reached low limit threshold Set limit to zero to disable

5 Sensor reading is out of range Check sensor wiring

6 Gas mix error Gas mix must total 100%

7 Incorrect Settings Check settings

8 In simulation mode Set simulation value to 0 to disable

9 Pulse/alarm output is out of range Check pulse/alarm output settings

10 Analog CH1 4-20mA is out of range Check analog output settings

11 Analog CH2 4-20mA is out of range Check analog output settings

12 Not used Not used

13 Not used Not used

14 CRC error Check parameters and reset CRC

15 Error in Total Reset total to clear alarm

Table 5.3: Status 2 Bits Definitions for Modbus Address 40017

Bit Definition Comment
0 Pulse hardware

1 Busy

2 HART hardware

3 FT4X

4 CAL-V in process

5 CAL-V fail

6 CAL-V aborted

7 CAL-V warning

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Write Single Register (Command 06)

This command is used to perform miscellaneous functions such as clearing the totalizer and elapsed
time. The register address is Modbus=40018 and the data to write is described in table 5.1.

Request:
<Meter Address> <Command code=06> <Register address high=0x00> <Register address
low=0x11> <Register data high=0x00> <Register data low =0x02> <CRC high> <CRC low>

Response:
<Meter Address> <Command code=06> <Register address =0x00> <Register address =0x11>
<Register data=0x00> <Register data =0x02> <CRC high> <CRC low>

Write Multiple Registers (Command 16)

This command is restricted to writing to the gas mix percentage settings in registers 40058 – 40091.
The preset single register command is not allowed to write to these registers. The percentage settings
are 32-bit floating point numbers in units of percent. A setting of 12.7 means 12.7%.

Request message:
<Meter Address> <Command code=16 (0x10)> <Starting register address MSB> <Starting register
address LSB> <Number of registers MSB> <Number of registers LSB> <Byte count> <Register data
MSB> <Register data LSB> … <Register data MSB> <Register data LSB> <CRC LSB> <CRC MSB>

Response message:
<Meter Address> <Command code=16 (0x10)> <Starting register address MSB> <Starting register
address LSB> <Number of registers high> <Number of registers low> <CRC LSB> <CRC MSB>

NOTE! Response Message issue with Firmware v7.0 and earlier: the starting register in the
Response Message is incorrect.

Floating point data layout

Each 32-bit floating point value uses two consecutive Modbus registers. The most significant byte of
the lower numbered register holds the least significant byte of the significand. The least significant
byte of the lower numbered register holds the next most significant byte of the significand. The most
significant byte of the higher numbered register holds the sign bit and most significant 7 bits of the
exponent. The least significant byte of the higher numbered register holds the least significant bit of
the exponent and the most significant 7 bits of the significand.

In the following tables:

S0 – S23 are the significand bits from least to most significant.
E0 – E7 are the exponent bits from least to most significant.
Sign is 1 if the number is negative, and 0 if the number if positive.

Lower numbered register

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
S15 S14 S13 S12 S11 S10 S9 S8 S7 S6 S5 S4 S3 S2 S1 S0

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Higher numbered register

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Sign E7 E6 E5 E4 E3 E2 E1 E0 S22 S21 S20 S19 S18 S17 S16

Since the Modbus register data is sent most significant byte first and the registers are sent lowest
numbered first, a floating point value will look like this in the data stream:

First byte (MSB of lower register)

Data bit 7 6 5 4 3 2 1 0
Value bit S15 S14 S13 S12 S11 S10 S9 S8

Second byte (LSB of lower register)

Data bit 7 6 5 4 3 2 1 0
Value bit S7 S6 S5 S4 S3 S2 S1 S0

Third byte (MSB of higher register)

Data bit 7 6 5 4 3 2 1 0
Value bit Sign E7 E6 E5 E4 E3 E2 E1

Fourth byte (LSB of higher register)

Data bit 7 6 5 4 3 2 1 0
Value bit E0 S22 S21 S20 S19 S18 S17 S16

Example: Set the gas mix as 60% methane and 40% nonane.

This requires setting the thirty-four registers 40058 through 40091. Register pair 40058-40059 will be
set to 60.0, register pair 40090-40091 will be set to 40.0, and the rest of the register pairs between
them will be set to 0.0.

The message byte stream will be (bytes on the same line are sent leftmost first):
<0x01> Address = 1
<0x10> function = write multiple registers
<0x00> <0x39> start index = fifty seven, meaning register 40058
<0x00> <0x22 register count = 34 (holding seventeen 32-bit floating point values)
<0x44> number of data bytes = 68
<0x00> <0x00> <0x42> <0x70> value = 60.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%

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<0x00> <0x00> <0x00> <0x00> value = 0.0%

<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x00> <0x00> value = 0.0%
<0x00> <0x00> <0x42> <0x20> value = 40.0%
<0xCA> <0x24> CRC

Response message:
<0x01> Address = 1
<0x10> function = write multiple registers
<0x00> <0x39> start index = fifty-seven = register 40058
<0x00> <0x44> Number of data bytes written = 68
<0x10> <0x37> CRC

Select Record (command 06, Preset Register, Modbus Address 40032)

This command is used to select a 24 hour record that is going to be read from the data log buffer
using command 03
Address register = 40032
Data = xx. (xx = record select (hex 0-63, decimal 0-39)
NOTE! Record 0 is the latest and 39 is the oldest.

Request:
<Meter Address> <Function code=06> <Register address high=0x00> <Register address low=0x1F>
<Register data high=0x00> <Register data low =0xx> <CRC high> <CRC low>

Response:
<Meter Address> <Function code=06> <Register address =0x00> <Register address =0x1F>
<Register data=0x00> <Register data =0xx> <CRC high> <CRC low>

Read 24 Hour Record (command 03, Read Holding register, Modbus Address 40034)
This register is used to get the data for a single 24 hour record in the floating point format. Before
issuing that command, a preset command has to be sent to select the record to be read.
Request:
<Meter Address> <Function code=03> <Register address high=0x00> <Register address low=0x21>
<No. of Point high=0x00> <No. of Point Low =01> <CRC high> <CRC low>

Response:
<Meter Address> <Function code=03> <Byte count=2><Register data=xx> <Register data =xx>
<CRC high> <CRC low>

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NOTE! The register returns a floating point value in IEEE754 format.

Clear Data Log (command 180 (0xB4), Modbus Address 40018)

This command is used to clear all records in the log.
Address register = 40018
Data = 180 (0xB4).

NOTE! Some log values might be readable until the meter is power cycled. Cleared values will
return a value of zero when read.

Request:
<Meter Address> <Function code=06> <Register address high=0x00> <Register address low=0x11>
<Register data high=0x00> <Register data low =0xB4> <CRC high> <CRC low>

Response:
<Meter Address> <Function code=06> <Register address =0x00> <Register address =0x11>
<Register data=0x00> <Register data =0xB4> <CRC high> <CRC low>

Populate Time Registers (Command 186 (0x8BA), Modbus Address 40018)

Write command value 186 to register 40018 to populate time registers 40044 - 40055, with the
current time and date in the meter. Allow at least 0.25 seconds for the time registers to update
completely before reading them..

NOTE! The time can be read but can NOT be set using Modbus.

Communication Protocol and Parameters

To program the communication parameters, start at the Main Menu:

MAIN MENU
I/O FLO DSP EXIT

F1 F2 F3 F4

Then press I/O (F1) to set Inputs/Outputs:

SET I/O
COM 420 EXIT

F1 F2 F3 F4

Then press COM (F1) to select communication parameters.

Set Bus protocol for Modbus:

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Comm=Modbus
NXT OK

F1 F2 F3 F4

Press NXT (F1) repeatedly until Modbus is selected as shown and then press OK (F4) to accept the
setting.

The following communication settings apply only to Modbus:

Baud=9600
NXT OK

F1 F2 F3 F4

Press NXT (F1) repeatedly until the correct selection is shown then press OK (F4) to accept the
setting.
Selections are: 115200 38400 4800
76800 19200 2400
57600 9600 1200

Parity=EVEN
NXT OK

F1 F2 F3 F4

Press NXT (F1) repeatedly until the correct selection is shown and then press OK (F4) to accept the
setting.

Selections are: NONE

ODD
EVEN

Address=02
CHG OK

F1 F2 F3 F4

Press CHG (F1) to change the address and then press OK (F4) to accept the setting.

Selections are between 01 and 247.

NOTE! Power cycle is required for the new settings to take effect.

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Using Modbus to Program Gas-SelectX®

Modbus can be used to access and program gases/gas mixes in the Gas-SelectX® feature available on
the model FT4X.

Selecting FT4X Gases and Gas Mixes

Modbus register 40057 is used to set the gas type, which may be a pure gas (plus NAESB natural gas
composition), custom gas mix, or custom oil & gas mix. Register 40057 will read zero, and register
40056 will read the gas selection that was chosen. Writing to register 40056 will produce an error
response. See the Gas Selection Codes table for the values to write.

Table 5.4: Gas Selection Codes

Selection Code Gas Selection Code Gas
0 Methane 12 Iso Butane
1 CO2 (Carbon Dioxide) 13 Ethane
2 Nitrogen 14 Pentane
3 Air 15 Hexane
4 Natural Gas 16 Heptane
5 Argon 17 Octane
6 Propane 18 Nonanes
7 Helium 19 Ethylene
8 Oxygen 20 Propylene
9 Reserved 250 Mixed gas (must set percentages)
10 Butane 251 Oil & Gas mix
11 Hydrogen

NOTE! Natural gas is defined as NAESB typical mixture of 94.9% Methane, 2.5% Ethane, 1.6%
Nitrogen, 0.7% CO2, 0.3% Propane.

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Setting Mix Percentages

First set the gas select code to Mixed Gas (250) or Oil & Gas mix (251). Next, go through each gas
relevant to the mix type and set their percentage to the desired 32 bit floating point value - this
value is split in two 16 bit registers. Ensure that all gases total up to 100%. Do not write a custom gas
percent when the gas select code is set to a pure gas.

Table 5.5: FT4X Modbus Holding Registers for Gas-SelectX®

40056 16-bit int Gas type selection See Table 5.4 of gas selection codes
40057 16-bit int Gas type selection for Modbus

40058 32-bit float LSW Methane (C1) percentage Percent (31.4 = 31.4%)
40059 32-bit float MSW
40060 32-bit float LSW Carbon Dioxide percentage Percent (31.4 = 31.4%)
40061 32-bit float MSW
40062 32-bit float LSW Nitrogen percentage Percent (31.4 = 31.4%)
40063 32-bit float MSW
40064 32-bit float LSW Air percentage Percent (31.4 = 31.4%)
40065 32-bit float MSW
40066 32-bit float LSW Argon percentage Percent (31.4 = 31.4%)
40067 32-bit float MSW
40068 32-bit float LSW Propane percentage Percent (31.4 = 31.4%)
40069 32-bit float MSW
40070 32-bit float LSW Helium percentage Percent (31.4 = 31.4%)
40071 32-bit float MSW
40072 32-bit float LSW Oxygen percentage Percent (31.4 = 31.4%)
40073 32-bit float MSW
40074 32-bit float LSW n-Butane percentage Percent (31.4 = 31.4%)
40075 32-bit float MSW
40076 32-bit float LSW Hydrogen percentage Percent (31.4 = 31.4%)
40077 32-bit float MSW
40078 32-bit float LSW i-Butane percentage Percent (31.4 = 31.4%)
40079 32-bit float MSW
40080 32-bit float LSW Ethane percentage Percent (31.4 = 31.4%)
40081 32-bit float MSW
40082 32-bit float LSW Pentane percentage Percent (31.4 = 31.4%)
40083 32-bit float MSW
40084 32-bit float LSW Hexane percentage Percent (31.4 = 31.4%)
40085 32-bit float MSW
40086 32-bit float LSW Heptane percentage Percent (31.4 = 31.4%)
40087 32-bit float MSW
40088 32-bit float LSW Octane percentage Percent (31.4 = 31.4%)
40089 32-bit float MSW
40090 32-bit float LSW Nonane percentage Percent (31.4 = 31.4%)
40091 32-bit float MSW

Communications | 93
Model FT4X
Communications

40092 32-bit float LSW Ethylene percentage Percent (31.4 = 31.4%)

40093 32-bit float MSW
40094 32-bit float LSW Propylene percentage Percent (31.4 = 31.4%)
40095 32-bit float MSW
40096 - 40195 Reserved

NOTES!
• In Least Significant Word (LSW) and Most Significant Word (MSW), “word” is one 16-bit
Modbus register. A 32-bit float or 32-bit integer is stored in a pair of Modbus registers.
When a register is designated as “32-bit int LSW”, it means that bits 0-15 of the variable are
in that register. A register designated as MSW has bits 16-31 of the variable. For instance,
the flow total can be read as a 32-bit integer from registers 40003 (LSW) and 40004 (MSW).
If the flow total is 0x12345678, then register 40003 will hold 0x5678, and register 40004 will
hold 0x1234. See the layout of a 32-bit floating point value on p. 87.
• 32-bit floating point values are defined by the IEEE 754 standard: https://ieeexplore.ieee.
org/document/8766229
• Refer also to Wikipedia: https://en.wikipedia.org/wiki/Single-precision_floating-point_format

Communications | 94
 Model FT4X
Communications

Scope - HART Communication

The Fox Thermal model FT4X transmitter complies with HART Protocol Revision 7.1. This section of
the manual specifies all the device-specific features and documents HART Protocol implementation
details (e.g., the Engineering Unit Codes supported). The functionality of this Field Device is described
sufficiently to allow its proper application in a process and its complete support in HART-capable Host
Applications.

Purpose
This specification provides a complete description of this Field Device from a HART Communication
perspective. The specification is designed to be a technical reference for HART capable Host
Application Developers, System Integrators and knowledgeable End Users. It also provides
functional specifications (e.g., commands and performance requirements) used during development,
maintenance and testing. This document assumes the reader is familiar with HART Protocol
requirements and terminology.

References
HART Communication Protocol Specification. HCF_SPEC-12.

Device Identification

Manufacturer Name: Fox Thermal Instruments Model Name: FT4X

Manufacture ID Code: 24635 Device Type Code: 63784 (F982 Hex)

HART Protocol Revision: 7.1 Device Revision: 1

No. of Device Variables: None

Physical Layers
FSK
Supported:
Physical Device Transmitter, DC-isolated Bus
Category: Device

Product Overview
The FT4X HART communication option can be monitored and configured using a HART master device
or a hand-held communicator.

Process Flow Rate 4-20mA Analog Output

The 4-20mA output of the FT4X HART represents the process flow rate measurement, linearized and
scaled according to the configured range of the instrument. This output corresponds to the Primary
Variable. HART Communication is supported on this loop.

The 4-20mA output of the FT4X should be configured for flow rate when using HART. If the
4-20mA output is set to report temperature, HART communication will report the 4-20mA value for
temperature rather than flow.

Communications | 95
Model FT4X
Communications

HART Indicators
Green LED indicator LP3 cycles on and off to indicate that the FT4X is operating. Orange LED
indicator LP2 blinks when HART signals are received and Yellow LP1 blinks when HART signals are
transmitted. The LEDs are located behind the display panel.

The orange LED indicator LP2 will be on continuously when HART communication is enabled and the
4-20mA wiring is not connected.

FT4X HART Communication Setup

HART communication must be selected in the FT4X Serial Communication menu for HART
communication to operate. When this communication parameter is changed, power to the FT4X must
be cycled for it to take effect.

Communication Protocol and Parameters

To program the communication parameters, press I/O (F1) key from the Main Menu.

MAIN MENU
I/O FLO DSP EXIT

F1 F2 F3 F4

This is the Main Menu for the programming mode. To exit the programming mode, press EXIT
(F4) repeatedly until “Normal Mode” is seen briefly. Choose I/O (F1) to access the communication
output.

SET I/O
COM PUL 420 EXIT

F1 F2 F3 F4

Then press COM (F1) to select communication parameters.

Set Bus protocol for HART:

Comm=HART
NXT OK

F1 F2 F3 F4

Press NXT (F1) until HART is selected as shown and then press OK (F4) to accept the setting.

NOTE! Power cycle is required for the new settings to take effect.

Communications | 96
 Model FT4X
Communications

Dynamic Variables
Four Dynamic Variables are implemented.

Variable Meaning Units

PV Flow Rate In Selected Units
SV Total In Selected Units
TV Temperature In Selected Units
QV Elapsed Time In Hours

Status Information
Device Status
Bit 4 ("More Status Available") is set when any failure is detected. Command #48 provides additional
detail.

Extended Device Status

This bit is set if a sensor error is detected. "Device Variable Alert" is set if the Primary Variable (PV) is
out of limit.

Additional Device Status (Command 48)

Command #48 returns 2 Device-Specific Status bytes of data, with the following status information:
These bits are set when an alarm or error condition is present. The bit automatically clears when the
condition returns to its normal state.

Byte Bit Meaning Class

0 0 Power Up Indication Status
1 High Flow Limit Alarm Alarm
2 Low Flow Limit Alarm Alarm
3 High Temperature Limit Alarm Alarm
4 Low Temperature Limit Alarm Alarm
5 Sensor out of range Error
6 Velocity out of range Error
7 Check Parameter Settings Error

1 0 In Simulation Mode Alarm

1 Frequency output out of range Alarm
2 CH 1 4-20mA out of range Alarm
3 CH 2 4-20mA out of range Alarm
4 Busy Alarm
5 Bridge shutdown Error
6 CRC database error Error
7 Error with Total Error

Communications | 97
Model FT4X
Communications

Common-Practice Commands, Supported Commands

The following common-practice commands are implemented:
34 Write Primary Variable (PV) Damping Value
35 Write PV Range Value
36 Set PV Upper Range Value
37 Set PV Lower Range Value
38 Reset "Configuration Changed" Flag
40 Enter/Exit Fixed Current Mode
44 Write PV Units
45 Trim Loop Minimum
46 Trim Loop Maximum
48 Read Additional Device Status (Command #48 returns 2 bytes of data)
59 Write Number of Response Preambles

Common-Practice Commands, Unsupported Commands

Burst Mode - This device does not support Burst Mode.
Catch Device Variable - This device does not support Catch Device Variable.
Device-Specific Commands - No Device-Specific commands are implemented.

Modes
Fixed current mode is implemented, using Command 40. This mode is cleared by power loss or reset.

Damping
Damping is standard, affecting only the PV and the loop current signal.

Capability Checklist
Manufacturer, model Fox Thermal Instruments, FT4X
Device Type Transmitter
HART revision 7.1
Device Description available No
Number and type of sensors 1
Number and type of actuators 0
Number and type of host side signals 1 : 4-20mA analog
Number of Device Variables 0
Number of Dynamic Variables 4
Mappable Dynamic Variables No
Number of common-practice commands 17
Number of device-specific commands 0
Bits of additional device status 8
Alternative operating modes No
Burst mode No
Write-protection Yes

Communications | 98
 Model FT4X
Maintenance

PRECAUTIONS
WARNING! BEFORE ATTEMPTING ANY MAINTENANCE, TAKE THE NECESSARY SAFETY
PRECAUTIONS BEFORE REMOVING THE PROBE FROM THE DUCT (EXAMPLE: PURGE
LINES OF TOXIC AND/OR EXPLOSIVE GAS, DEPRESSURIZE, ETC...).
WARNING! EXPLOSION HAZARD. DO NOT REMOVE OR REPLACE COMPONENTS
OR FUSES UNLESS POWER HAS BEEN SWITCHED OFF WHEN A FLAMMABLE OR
COMBUSTIBLE ATMOSPHERE IS PRESENT.
WARNING! EXPLOSION HAZARD. DO NOT DISCONNECT EQUIPMENT WHEN A
FLAMMABLE OR COMBUSTIBLE ATMOSPHERE IS PRESENT.

Access to Electronics
Accessing electronics is not normally required for maintenance purposes. If a loose connection is
suspected, unscrew the rear cap of the meter to access the wiring terminations.

CAUTION! BE SURE POWER TO METER IS SWITCHED OFF BEFORE ATTEMPTING TO

ACCESS ELECTRONICS. If there is a problem and a loose connection is not found, please
contact Fox Thermal Customer Service for technical assistance at (831) 384-4300.

Broken or Damaged Probe

If the sensor is broken or damaged, the probe and electronics must be returned to the factory. A new
sensor will be installed and calibrated. Refer to "Returning Your Meter" on p. 126.

Flow Calibration and Calibration Validation

To ensure high accuracy of your model FT4X Flow Meter, Fox Thermal provides a full NIST traceable
calibration. It is recommended that the meter's accuracy be checked annually by performing the
CAL-V™ Calibration Validation test.

Fuse Replacement
WARNING! Turn input power OFF before removing or installing a fuse. Use only
recommended fuse replacements.

Verify the fuse is defective by measuring it with an ohm meter (Two replacement fuses are provided
with each unit). Replacement fuse is Littelfuse part number 0454.750MR. The 100 to 240VAC power
option FT4X does not have a replaceable fuse.

To replace the fuse:

The fuse F1 is located near the power terminal block and can be removed by using tweezers or
needle-nose pliers.

Sensor Cleaning
The sensor is insensitive to small amounts of residue, but continued use in dirty environments will
require periodic cleaning. To inspect the sensor, remove power from electronics and remove the unit
from the pipe or duct, exposing the sensor elements. If they are visibly dirty, clean them with water or
alcohol (ethanol) using an appropriate brush until they appear clean again. Even though the sensor
elements are rugged, avoid touching them with any solid object and use a light touch while cleaning
them.
Maintenance | 99
Model FT4X
Maintenance

Instructions for Removing and Inserting the Meter from a Pressurized Pipe using the Retractor

WARNING! Possible injury or damage to equipment may occur if the retractor is not used
correctly. Please read the following instructions carefully prior to using the retractor.

CAUTION! Never remove the restraint cable without first closing the Ball Valve and bleeding
off pressure.

WARNING! When working with the retractor, do not stand or position any part of your body
in the path of the flow meter. An injury may occur if the probe is forced outward by system
pressure.

How to Remove the Meter from the Retractor (System Pressurized)

Step 1 - Remove the Probe from the Flow Stream

1. Disconnect power from the meter.

NOTE! At 150 psig of max system pressure, the probe will have approximately 66 lbs. of force
pushing it out.
2. System pressure may force the probe out of the retractor when the compression nut is loosened.
Hold the flow meter to counteract the force of the system pressure, and carefully loosen and
unscrew the compression nut.
3. While supporting the meter, slowly slide the probe out of the retractor until the restraint cable is
tight.
4. Close the ball valve all the way.

CAUTION! At this point there is still pressure inside of the retractor.

Figure 6.1
Compression Nut,
1 ⅛" Wrench

Compression Fitting,
1 ¼" Wrench

Maintenance | 100
 Model FT4X
Maintenance

Step 2 - Remove the Probe from the Retractor Body

5. After removing the probe from the flow stream (#1-4 on previous page), slowly loosen the
compression fitting (see figure 6.2), until the pressure in the retractor is relieved.
6. Retighten the compression fitting.
7. Remove the Collar Clamp by using a 3/16" Hex Key.
8. Carefully slide the probe out of the retractor while supporting the meter.
Figure 6.2

F1 F2 F3 F4

COLLAR SPACER

COLLAR CLAMP

COMPRESSION NUT

COMPRESSION FITTING

BALL VALVE

Maintenance | 101
Model FT4X
Maintenance

How to Insert the Probe into the Flow Stream (Valve closed, System Pressurized)
1. Carefully, slide the probe into the retractor.
2. Install the collar clamp just below the collar spacer, and tighten it in place on the probe. Slide the
probe back out of the retractor until the cable is straight and taut.
Figure 6.3

F1 F2 F3 F4

COLLAR SPACER

COLLAR CLAMP

COMPRESSION NUT

COMPRESSION FITTING

BALL VALVE

NOTE! At a maximum system pressure of 150 psig, the force required to push the probe in
place to tighten the compression Nut will be approximately 66 lbs.
3. Slowly open the ball valve to the full open position. Push the meter and probe into the pipe, then
hand tighten the compression nut onto the compression fitting.
4. Verify that the probe is aligned with the center line of the pipe, and pointed in the direction of
flow.

Maintenance | 102
 Model FT4X
Maintenance

5. Secure the probe in place by tightening the compression nut with a 1 ⅛" wrench and a 1 ¼"
wrench on the compression fitting. See p. 25 of the manual for detailed instructions to tighten
the compression nut.
6. Power may now be applied to the meter.

Figure 6.4

F1 F2 F3 F4

COMPRESSION NUT & FERRULES

COMPRESSION FITTING

Maintenance | 103
Model FT4X
Troubleshooting

Troubleshooting
CAUTION! The electronics and sensor supplied by Fox Thermal are calibrated as a single
precision mass flow meter. Interchanging sensors will decrease the accuracy of the flow meter.
If you experience any problem with your model FT4X flow meter, call Fox Thermal Customer
Service Department, Technical Assistance at (831) 384-4300.

Problem Possible Cause(s) Action(s)

Meter does not 1. Malfunction in flow 1. Return flow meter to Fox Thermal for repair
initialize meter (Refer to p. 126 for shipping instructions)
2. Electromagnetic 2. Check meter power cycles.
Interference (EMI) 3. Press and release F1 and F2 at the same time;
the display will enter Engineering screens.
4. Press F1 to get to screen #23; record power
cycle value.
5. Press F4 to return to normal operation; monitor
meter until problem returns.
6. Return to screen #23 to see if power cycles
have increased; microprocessor is resetting due
to EMI electrical noise entering the meter.
7. Check Power input and output cables
grounding and routing.

Flow measurement 1. Very turbulent flow 1. Increase dampening (see filter settings in "Flow
is erratic or 2. Sensor dirty Parameters" on p. 64)
fluctuating 3. Sensor broken 2. Clean sensor (Refer to Maintenance section, p.
4. Probe not mounted 99)
securely 3. Return flow meter to Fox Thermal for repair
5. Malfunction in flow (Refer to p. 126 for shipping instructions)
meter 4. Remount probe (see Installation section, p.
6. Meter installed 21); must be mounted securely without
incorrectly vibration. If vibration persists, choose a new
mounting location without vibration.
5. Return flow meter to Fox Thermal for repair
(Refer to p. 126 for shipping instructions)
6. Re-install meter according to instructions (Refer
to installation section, p. 21)

Troubleshooting | 104
 Model FT4X
Troubleshooting

Problem Possible Cause(s) Action(s)

Display Error 1. Loose or damaged 1. Visual inspection.
ribbon cable 2. Return the meter or display for repair.
2. Damaged electronics
3. Ambient temperature 3. Operate meter between -20 to 70°C
Flow measure- 1. Probe not oriented 1. Orient probe per installation sections: Insertion
ment seems low properly (p. 27)
2. Sensor dirty 2. Clean sensor (p. 99)

Unit will not 1. No power input or bad 1. Check for correct power supply voltage at TS1
power-up power supply on main board.
2. Bad fuse 2. Check fuse (F1) located next to TS1 on main
board.
If fuse is OK and unit still won’t power up, call Fox
Thermal for additional assistance.

The 100 to 240VAC power option FT4X does not

have a replaceable fuse.

Troubleshooting | 105
Model FT4X
Troubleshooting

Troubleshooting CAL-V™
If the FT4X Meter fails a CAL-V™ Calibration Validation test, there are a few reasons that could be the
cause:

1. Flow rate in the pipe:

• Run the test again under a higher flow rate if possible.
2. The sensor may be dirty or damaged:
• Visually inspect the meter for damage. If damage is found, meter may need to be serviced.
Contact Fox Thermal Technical Assistance at 831-384-4300 for more information.
• Try cleaning the sensor and try the test again under flow conditions.
3. If the meter fails again, contact Fox Thermal Technical Assistance at 831-384-4300 for more
information.

Troubleshooting | 106
 Model FT4X
Troubleshooting

Installation Problems
The following is a summary listing of problems that may be encountered with the installation of the
FT4X thermal mass flow meter.
1. Improper wiring connections.
Refer to Figures 3.1 to 3.12 and "Wiring Precautions" in Wiring section (p. 33) for further
guidance.
2. Inadequate DC power source.
The FT4X requires 12 to 24VDC at to 6 Watts to operate. A 20 Watt power supply is recommended
for powering the FT4X to ensure it operates properly under all temperature ventilation, and power
on conditions. If the voltage supplied at the input terminals of the FT4X is not within the range of
10VDC to 30VDC, a variety of problems can occur including a dim display, inaccurate flow readings
or faulty 4-20mA, pulse and communication interface. The 100 to 240VAC power option requires
85 to 264VAC to operate.
3. Flow measurement seems inaccurate.
• Check to ensure that the flow meter is installed so that the Flow Direction Indicator is pointing
in the direction of flow. Refer to Figure 2.8 (p. 27). If not, change orientation of meter.
• Check that the insertion depth of the sensor/probe is correct. The end of the probe should be
adjusted as per Figure 2.5 (p. 24).
• Ensure that there are a minimum of fifteen diameters of straight pipe upstream of the sensor
and ten diameters downstream. If complex flow disturbances are upstream of the sensor,
extension of the straight pipe may be required to ensure accurate flow measurement. Contact
Fox Thermal for assistance.
• Ensure that the pipe inside diameter and gas composition settings in the meter matches data
on the Fox Thermal Calibration Certificate. These settings are programmed into the flow meter
through the front panel (see Flow Parameters, p. 64 and Gas Selection, p. 72).
4. Erratic flow reading (especially a flow reading spiking high).
This may be a symptom of moisture in the flow stream. Fox Thermal flow meters are designed to
work in relatively dry gas applications only, reference information on page 22. Contact Fox Thermal
to discuss resolutions to this problem.
5. Flow meter is not responding to flow.
• Check to ensure adequate power is supplied to the flow meter. If things appear to be correct,
perform this functional test before calling Fox Thermal. Carefully remove the probe and sensor
from the pipe. For those flow meters with a display - and if the display is reading zero - blow
on the sensor to see if a response occurs. If nothing happens, take a damp rag or sponge and
place it in contact with the sensor. A reading should occur. Contact Fox Thermal Customer
Service with this information.
6. Display and/or 4-20mA signal reading above zero flow when no flow is occurring in the pipe.
If the reading is less than 5% of full scale, it is likely this is a normal condition caused by
convection flow created by the heated sensor. It does not mean that the zero of the instrument is
improperly set. The Fox Thermal sensor is extremely sensitive to gas flow and can even read the
small flow caused by convection. If this is an unacceptable condition, please contact Fox Thermal
Customer Service for alternatives.

Troubleshooting | 107
Model FT4X
Troubleshooting

Alarm Codes
Alarm
Reason Action
Code
Flow rate above Refer to the FLOW MENU 2 section on p. 63 of this Manual to verify limit is
13
high limits within range. Check ALM = HiFloAlm under PRM.
Flow rate below low Refer to the FLOW MENU 2 section on p. 63 of this Manual to verify limit is
14
limits within range. Check ALM = LoFloAlm under PRM.
Temperature above Refer to the FLOW MENU 2 section on p. 63 of this Manual to verify limit is
15
high limits within range. Check ALM=HiTempAlm under PRM.
Temperature below Refer to the FLOW MENU 2 section on p. 63 of this Manual to verify limit is
16
low limits within range. Check ALM = LoTempAlm
Check the CSV voltage in ENG menu of LOGS MENU 1, refer to page 15.
It should be approximately 0.04 volts when FT4X is measuring no flow and up
to 0.25 volts at high flow.

Measure resistance of the sensor wires, the wires must be removed from FT4X
terminal block, refer to page 33.
Resistance from Red to White wires, approximately 9 ohms.
22 Sensor out of range Resistance from Blue to Yellow wires, approximately 109 ohms.

If FT4X has remote sensor option, verify this wiring is correct, refer to page 46.

Verify that parameters in FT4X are set correctly. If FT4X View is available,
check parameter settings in Configuration page.
If using FT4X front panel, check parameters in UNIT menu of FLOW MENU 1
and PRM menu of FLOW MENU 2, refer to pages 10-11.

23 Gas mix error Gas mix must equal 100%. Refer to page 14.

One or more internal settings are corrupted or out of spec. Contact Fox
24 Check settings
Thermal Service for instructions to verify settings.
Meter is in Simulation Mode. Refer to the FLOW MENU 1 section on p. 66.
25 Simulation mode
Use the SIM Section under Diagnostics to return to normal operation.
Pulse/alarm output Refer to the DIGITAL OUTPUT MENU on p. 9 of this Manual. Verify the
26
over range Pulse/alarm Output settings are within limits.
4-20mA is out of Refer to the MAIN MENU on p. 8 of this Manual. Use the Set I/O section
32
range to verify range limits.
Temperature
Refer to the MAIN MENU on p. 8 of this Manual. Use the Set I/O
33 4-20mA out of
section to verify range limits.
range

34 Busy Meter is recalculating new parameters.

Troubleshooting | 108
 Model FT4X
Troubleshooting

Alarm
Reason Action
Code
Refer to the Reset CRC section on p. 68 of this manual. Verify the
36 Database CRC Error programmed values are verified and corrected before clearing the error.
Contact Fox Thermal Service Department for possible causes.
The CSV Voltage is out of the acceptable range. This may be a result of failed
38 CSV Volt Error electronics, parameters, or sensor connections. Refer to action of Alarm Code
22.
The VFLO Voltage is out of the acceptable range. This may be a result of failed
39 VFLO Volt Error electronics, parameters, or sensor connections. Refer to action of Alarm Code
22.
The TSV Voltage is out of the acceptable range. This may be a result of failed
40 TSV Volt Error electronics, parameters, or sensor connections. Refer to action of Alarm Code
22.
The VTEMP Voltage is out of the acceptable range. This may be a result of
41 VTEMP Volt Error failed electronics, parameters, or sensor connections. Refer to action of Alarm
Code 22.
The Delta T error between the sensor elements is too large. This may be a
42 Delta T Error result of failed electronics, parameters, or sensor connections. Refer to action
of Alarm Code 22.
The board calibration values do not match the values saved in the backup.
Invalid Board This is the result of data corruption. The best course of action is to perform a
43
Calibration Values "Restore Database" within the meter menus - this will restore the meter to its
factory settings and calibrations.
This may be a result of failed electronics, parameters, or sensor connections.
46 TEMP Input Error
Refer to action of Alarm Code 22. Focus on the Yellow and Blue wires.
This may be a result of failed electronics, parameters, or sensor connections.
47 TSV Input Error
Refer to action of Alarm Code 22. Focus on the Yellow and Blue wires.
This may be a result of failed electronics, parameters, or sensor connections.
48 CSV Input Error
Refer to action of Alarm Code 22. Focus on the Red and White wires.
This may be a result of failed electronics, parameters, or sensor connections.
49 FLO Input Error
Refer to action of Alarm Code 22. Focus on the Red and White wires.
ADC Temp Below This is the result of low temperatures inside the meter enclosure. Be sure keep
53
Spec the meter within the specification.
ADC Temp Above This is the result of high temperatures inside the meter enclosure. Be sure
54
Spec keep the meter within the specification.

55 ADC NOREF This is a result of failed electronics. Contact support for further assistance.

Troubleshooting | 109
Model FT4X
Appendix

Performance Specs
Flow Accuracy:
Air and Nitrogen (N2): ±1% of reading ±0.2% of full scale
Other gases: ±1.5% of reading ±0.5% of full scale
Accuracy specification applies to customer's selected flow range
Maximum range: 15 to 60,000 SFPM (0.07 to 280 NMPS)
Minimum range: 15 to 500 SFPM (0.07 to 2.4 NMPS)
Typical straight, unobstructed pipe requirement
Insertion Meters: 15 diameters upstream; 10 downstream
Inline Meters: 8 diameters upstream; 4 downstream
Insertion Meters with FC20: 5 diameters upstream of FC20; 5 diameters downstream of FT4X
Gross Heating Value Uncertainty: ±0.01% of mass basis; ±1.0% on volume basis
Flow Repeatability: ±0.2% of full scale
Flow Response Time: 0.8 seconds (one time constant)
Temperature Accuracy: ±1° F (±0.6° C)
Calibration:
Factory Calibration to NIST traceable standards
CAL-V™: In-situ, operator-initiated calibration validation

Operating Specs
Gas-SelectX® Gas Selections:
Pure gas menu, Gas Mix Menu, and Oil & Gas Mix Menu. See the Fox Thermal website for more
information on availability of current gases.

Units of Measurement (field selectable):

SCFM, SCFH, NM3/M, NM3/H, NM3/D, NLPS, NLPM, NLPH, MCFD, MSCFD, SCFD, MMSCFD,
MMSCFM, SM3/D, SM3/H, SM3/M, LB/S, LB/M, LB/H, LB/D, KG/S, KG/M, KG/H, SLPM, MT/H

Gas Pressure (maximum at 100º F (38ºC)):

Insertion meter: 740 psig (51.02 barg)
316 SS inline meter with NPT ends: 500 psig (34.5 barg)
316 SS inline meter with 150 lb. flanges: 230 psig (15.86 barg)
316 SS inline meter with 300 lb. flanges: 600 psig (41 barg)
Carbon steel inline meter with NPT ends: 500 psig (34.5 barg)
Carbon steel inline meter with 150 lb. flanges: 285 psig (19.65 barg)
Carbon steel inline meter with 300 lb. flanges: 740 psig (51 barg)

Retractor Assembly: 150 psig (10.34 barg)

NOTE! Check with factory for higher pressure options.
NOTE! When teflon ferrule option ordered, gas pressure is 60psig (4.1 barg) maximum
NOTE! The EU Pressure Equipment Directive (PED) requires that the minimum ambient and fluid
temperature rating for carbon steel flow bodies not be below -29°C.

Appendix | 110
 Model FT4X
Appendix

Operating Specs (cont'd)

Temperature:
DDC-Sensor™: -40 to 250°F (-40 to 121°C)
Enclosure: -40 to 158°F (-40 to 70°C)*
Remote Sensor Enclosure: -40 to 158°F (-40 to 70°C)
*NOTE! Display dims below -4˚F (-20˚C), function returns once temperature rises again.

Relative Humidity: 90% RH maximum; non-condensing

NOTE! Condensing liquids contacting the sensor can cause erratic flow indication.

Flow Velocity Range:

15 to 60,000 SFPM (0.07 to 280 NMPS)
Turndown: up to 1000:1; 100:1 typical

Maximum Flow Ranges for Insertion Flow Meters

Pipe Diameter SCFM MSCFD NM3/hr
1.5" (40mm) 0-840 0-1,220 0-1,325
2" (50mm) 0-1,400 0-2,020 0-2,210
2.5" (63mm) 0-2,000 0-2,880 0-3,150
3" (80mm) 0-3,100 0-4,440 0-4,890
4" (100mm) 0-5,300 0-7,650 0-8,360
6" (150mm) 0-12,000 0-17,340 0-18,930
8" (200mm) 0-20,840 0-30,020 0-32,870
10" (250mm) 0-32,800 0-47,250 0-51,740
12" (300mm) 0-46,600 0-67,180 0-73,500

NOTE! To determine if the FT4X will operate accurately in other pipe sizes, divide the maximum flow
rate by the pipe area. The application is acceptable if the resulting velocity is within the velocity range
above. Check Fox Thermal website for velocity calculator.

Maximum Flow Ranges for Inline Flow Meters

Size SCFM MSCFD NM3/hr
0.75" 0-220 0-320 0-350
1" 0-360 0-520 0-570
1.25" 0-625 0-900 0-990
1.5" 0-840 0-1,220 0-1,325
2" 0-1,400 0-2,020 0-2,210
2.5" 0-2,000 0-2,880 0-3,150
3" 0-3,100 0-4,440 0-4,890
4" 0-5,300 0-7,650 0-8,360
6" 0-12,000 0-17,340 0-18,930

NOTE! Standard conditions of air at 70°F and one atmosphere. Consult factory for other gases and for
flow ranges above those listed. Inline meters above 5,000 SCFM (7,900 NM3/H) air may require third
party calibration. Contact Fox Thermal.

Appendix | 111
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Appendix

Operating Specs (cont'd)

Input Power:
12 to 24VDC —­­­­­– – – , 6 Watts. Full Input Power Range: 10 to 30VDC (standard DC power).

• A 20 Watt or greater DC power supply is recommended to power the FT4X.

100 to 240VAC , 50-60Hz, 7 Watts. Full Input Power Range: 85 to 264VAC (AC power option).
Class I Equipment (Electrical Grounding Required for Safety).
Installation (Over-voltage) Category II for transient over-voltages.

Inputs/Outputs:
4-20mA Channel 1:
• Standard isolated 4-20mA output configured to indicate flow; fault indication per NAMUR
NE43. HART serial communication option.
The 4-20mA load resistance must be 125 ohms or less when operating on 12 volt power and
600 ohms or less on 24 volt power.
4-20mA Channel 2:
• Standard isolated 4-20mA output configured to indicate either flow or temperature.
Pulse/Alarm:
• Isolated open collector output rated for 5 to 24VDC, 20mA maximum load, 0 to 100Hz (the
pulse output can be configured to either transmit a 0 to 100Hz signal proportional to flow
rate or an on/off alarm).
Remote Switch Input:
• Can be configured to reset the flow totalizer and elapsed time.
Serial Communication
• Isolated Modbus RTU (RS485) option
• Isolated HART communication option
USB Communication:
• Isolated USB 2.0 for interfacing with a laptop or computer is standard.
• FT4X View™: A free PC-based software tool that provides complete configuration, remote
process monitoring, and data logging functions through USB communication.

4-20mA and Loop Verification:

Simulation mode used to align 4-20mA output with the input to customer’s PLC/DCS.

Physical Specs
Sensor material:
316 stainless steel

Enclosure:
NEMA 4X (IP67), aluminum, ¾” FNPT conduit entries. Cabling to remote enclosure: 8-conductor, 18
AWG, twisted, shielded, 100 feet maximum.

Flow Meter Installation:

Fox Thermal-supplied compression fitting connects to customer-supplied ¾” female branch outlet
welded to pipe.
Appendix | 112
 Model FT4X
Appendix

Agency Approvals
CE: Approved
EMC Directive; 2014/30/EU
Electrical Equipment for Measurement, Control and Lab Use: EN61326-1:2013
Low Voltage Directive (LVD): 2014/35/EU
Product Safety Testing: EN 61010-1: 2010
Pressure Equipment Directive: 2014/68/EU
Weld Testing: EN ISO 15614-1 and EN ISO 9606-1, ASME B31.3
FM (FM17US0061X) and FMc (FM17CA0032X): Approved
Class I, Division 1, Groups B,C,D;
Class II, Division 1, Groups E,F,G;
Class III, Division 1; T6 or T4, Ta = - 40˚C to +70˚C;
Class 1, Zone 1, AEx/Ex db IIB + H2 T6 or T4 Gb; Ta= -20˚C to +70˚C; Type 4X, IP67
ATEX (FM17ATEX0015X): Approved
II 2 G Ex db IIB + H2 T6 or T4 Gb Ta = - 20˚C to +70˚C; IP67
II 2 D Ex tb IIIC T85˚C or T135˚C Db Ta = - 20˚C to +70˚C; IP67
IECEx (IECEx FMG 17.0008X): Approved
Ex db IIB + H2 T6 or T4 Gb Ta = - 20˚C to +70˚C; IP67
Ex tb IIIC T85˚C or T135˚C Db Ta = - 20˚C to +70˚C; IP67
UKEX (FM21UKEX0170X): Approved
II 2 G Ex db IIB + H2 T6 or T4 Gb Ta = - 20˚C to +70˚C; IP67
II 2 D Ex tb IIIC T85˚C or T135˚C Db Ta = - 20˚C to +70˚C; IP67
ATEX and IECEx Standards:
EN 60079-0 EN 60079-31 IEC 60079-0 IEC 60079-31
EN 60079-1 EN 60529 +A1 +A2 IEC 60079-1 IEC 60529
Specific Conditions of Use:
1. The flameproof joints of the equipment are not intended to be repaired. Consult the
manufacturer if dimensional information on the flameproof joints is necessary.
2. Refer to the manufacturer's instructions to reduce the potential of an electrostatic charging
hazard on the equipment or enclosure.
3. The equipment temperature code ratings are dependent on the enclosure configuration model
code (local or remote). Refer to the following table for specific temperature code markings.
Enclosure Temperature Code Marking - Temperature Code Marking - Temperature Code Marking - Zones
Model Code Divisions (All) Zones (Gas) (Dust)

Enclosure Main Remote Main Remote Main Remote

(variable 'b') Enclosure Enclosure Enclosure Enclosure Enclosure Enclosure
E1 T4 N/A T4 N/A T135°C N/A
E2 T4 N/A T4 N/A T135°C N/A
E3 T6 T4 T6 T4 T85°C T135°C
E4 T6 T4 T6 T4 T85°C T135°C

Appendix | 113
Model FT4X
Appendix

Fig. 7.1: Insertion Meter with Retractor Dimensions

Dimensions shown in inches (millimeters).

8.1
(206)
4.6
(117) 3.9
(99)

7.9±.2 F1 F2 F3 F4

(201±5.0)
2X 3/4" NPT,
FEMALE

"HH"

"LL" 9.3±0.3
(236±7.6)

Ø.75 PROBE
(Ø19.0)
.73"
(18.5)
DIMENSIONAL

Table 7.1: Insertion Meter with 316 stainless steel probe

Probe Size Probe Size Dimension “LL” ± .10 Dimension "HH" ±.30
[model code] [inches] [inches / millimeters] [inches / millimeters]
15R 15" 15.0" (381mm) 22.9" (582mm)
18R 18" 18.0" (457mm) 25.9" (658mm)
24R 24" 24.0" (610mm) 31.9" (810mm)
30R 30" 30.0" (762mm) 37.9" (963mm)
36R 36" 36.0" (914mm) 43.9" (1115mm)

Appendix | 114
 Model FT4X
Appendix

Fig. 7.2: Remote Insertion Meter with Retractor Dimensions

Ø3.6 8.1
4.4
(Ø91) (206)
(112) 4.6
2.0 (117) 3.9
(51) REMOTE (99)
ENCLOSURE

7.2±.2 5.2
(183±5) F1 F2 F3 F4
(132)

ELECTRONICS
ENCLOSURE
2X 3/4" NPT,
FEMALE
"HH"
CONDUIT, 3/4", METAL

"LL" 9.3±0.3
236±76 SHIELDED CABLE,
18 Gauge, 8-CONDUCTOR,
100FT (30.48m) MAX.

Ø .75 PROBE
Ø 19.0
.73
(18.5)

Table 7.2: Remote Insertion Meter with Retractor

Probe Size Probe Size Dimension “LL” ± .10 Dimension "HH" ±.30
[model code] [inches] [inches / millimeters] [inches / millimeters]
15R 15" 15.0" (381mm) 22.2" (564mm)
18R 18" 18.0" (457mm) 25.2" (640mm)
24R 24" 24.0" (610mm) 31.2" (792mm)
30R 30" 30.0" (762mm) 37.2" (945mm)
36R 36" 36.0 " (914mm) 43.2" (1097mm)

Appendix | 115
Model FT4X
Appendix

Fig. 7.3: Remote Mounting Kit Dimensions

SIDE VIEW
BRACKET

2x U-BOLT
W/NUT JAM NUT
SEE ADAPTER
DETAIL

PROJECTIONS
ADAPTER
4x
Ø2.38 WASHER
2 IN. PIPE

THREADS
ADAPTER DETAIL

FT4X ENCLOSURE FRONT VIEW

2.81
F1 F2 F3 F4

4x Ø.344

2.81

MOUNTING
HOLE DETAIL

Appendix | 116
 Model FT4X
Appendix

Fig. 7.4: Insertion Meter Dimensions

8.1
(206)
4.6
(117) 3.9
(99)

5.2
7.9±.2 F1 F2 F3 F4
(132)
(201±5)

"HH" 2X 3/4IN. NPT,

FEMALE

"LL"

.73
(18.5)
Table 7.4: Insertion Meter with 316 stainless steel probe

Probe Size Probe Size Dimension “LL” ± .10 Dimension "HH" ± .30
[model code] [inches] [inches / millimeters] [inches / millimeters]
06I 6" 6.0" (152mm) 13.9" (353mm)
09I 9" 9.0" (229mm) 16.9" (429mm)
12I 12" 12.0" (305mm) 19.9" (505mm)
15I 15" 15.0" (381mm) 22.9" (582mm)
18I 18" 18.0" (457mm) 25.9" (658mm)
24I 24" 24.0" (610mm) 31.9" (810mm)
30I 30" 30.0" (762mm) 37.9" (963mm)
36I 36" 36.0 " (914mm) 43.9" (1115mm)

Appendix | 117
Model FT4X
Appendix

Fig 7.5: Insertion Remote Meter Dimensions

Ø3.6 8.1
4.4
(Ø91) (206)
(112) 4.6
2.0 (117) 3.9
(51) REMOTE (99)
ENCLOSURE

7.2±.2 5.2
(183±5) F1 F2 F3 F4
(132)

"HH" ELECTRONICS
ENCLOSURE
2X 3/4" NPT,
"LL" FEMALE
CONDUIT, 3/4", METAL

.73" SHIELDED CABLE,

(18.5) 18 Gauge, 8-CONDUCTOR,
100FT (30.48m) MAX.

Table 7.5: Insertion Remote Meter with 316 stainless steel probe

Probe Size Probe Size Dimension “LL” ± .10 Dimension “HH” ± .30

[model code] [inches] [inches / millimeters] [inches / millimeters]

06I 6" 6.0" (152mm) 13.2" (335mm)
09I 9" 9.0" (229mm) 16.2" (411mm)
12I 12" 12.0" (305mm) 19.2" (488mm)
15I 15" 15.0" (381mm) 22.2" (564mm)
18I 18" 18.0" (457mm) 25.2" (640mm)
24I 24" 24.0" (610mm) 31.2" (792mm)
30I 30" 30.0" (762mm) 37.2" (945mm)
36I 36" 36.0" (914mm) 43.2" (1097mm)

Appendix | 118
 Model FT4X
Appendix

Fig. 7.6: Inline Meter with Flow Body and NPT End Connections Dimensions

8.1
4.6 (206)
(117) 4.3
(109)

2x 3/4 inch 5.2

NPT Female (132)
F1 F2 F3 F4

“H”

2x NPT Male Thread

CL

“L”

Table 7.6: Inline Meter with Flow Body and NPT End Connections

Body Size Body Size Dimension “L” ± .10 Dimension “H” ± .30
[model code] [inches] [inches] [inches / millimeters]
075P * 0.75" 12" 11.9" (302mm)
10P * 1.00" 12" 11.9" (302mm)
125P * 1.25" 12" 11.9" (302mm)
15P * 1.50" 12" 13.9" (353mm)
20P ** 2.00" 12" 13.9" (353mm)
25P ** 2.25" 18" 13.9" (353mm)
30P ** 3.00" 18" 13.9" (353mm)

*Available in 316 stainless steel pipe only.

**Available in 316 stainless steel pipe or A106 grade B carbon steel pipe + A105 flanges.

Appendix | 119
Model FT4X
Appendix

Fig 7.7: Inline Remote Meter with Flow Body and NPT End Connections Dimensions

3.6
(91)
4.4
(112)
2.0
4.6 (51)
(117)

4.5
(114)
5.2
(132)
F1 F2 F3 F4

Remote Cable, “HH”

18 Gauge, 8 Conductor,
Shielded, 100FT Max.
2x NPT
Male Thread

CL

“L”

Table 7.7: Inline Remote Meter with Flow Body and NPT End Connections

Body Size Body Size Dimension “L” ± .10 Dimension “HH” ± .30
[model code] [inches] [inches] [inches / millimeters]
075P * 0.75" 12" 11.2" (284mm)
10P * 1.00" 12" 11.2" (284mm)
125P * 1.25" 12" 11.2" (284mm)
15P * 1.50" 12" 13.2" (355mm)
20P ** 2.00" 12" 13.2" (355mm)
25P ** 2.50" 18" 13.2" (355mm)
30P ** 3.00" 18" 13.2" (355mm)

*Available in 316 stainless steel pipe only.

**Available in 316 stainless steel pipe or A106 grade B carbon steel pipe + A105 flanges.

Appendix | 120
 Model FT4X
Appendix

Fig. 7.8: Inline Meter with Flow Body and 150 lb. RF Flange End Connections Dimensions

8.1
(206)
4.6 4.3
(117) (109)

2x 3/4 inch
NPT Female 5.2
F1 F2 F3 F4
(132)

“H”

CL

“L”

2X Flange, Raised Face,

ANSI B16.5, 316 SST

Table 7.8: Inline Meter with Flow Body and 150 lb. RF Flange End Connections Dimensions

Body Size Body Size Dimension “L” ± .10 Dimension “H” ± .30
[model code] [inches] [inches] [inches / millimeters]
075F * 0.75" 12" 11.9" (302mm)
10F * 1.00" 12" 11.9" (302mm)
125F * 1.25" 12" 11.9" (302mm)
15F * 1.50" 12" 13.9" (353mm)
20F ** 2.00" 12" 13.9" (353mm)
25F ** 2.50" 18" 13.9" (353mm)
30F ** 3.00" 18" 13.9" (353mm)
40F ** 4.00" 18" 13.9" (353mm)
60F ** 6.00" 24" 13.9" (353mm)

*Available in 316 stainless steel pipe only.

**Available in 316 stainless steel pipe or A106 grade B carbon steel pipe + A105 flanges.

Appendix | 121
Model FT4X
Appendix

Fig 7.9: Inline Remote Meter with Flow Body and 150 lb. RF Flange End Connections Dimensions

3.6
(91)
4.4
(112)
2.0
(51)
4.6
(117)

4.5
2X 3/4 " NPT,
(114)
Female
5.2
(132)
F1 F2 F3 F4

“HH”

Remote Cable, 8 Conductor,

Shielded, 100FT Max.

CL

“L”

Table 7.9: Inline Remote Meter with Flow Body and 150 lb. RF Flange End Connections Dimensions

Body Size Body Size Dimension “L” ± .10 Dimension “HH” ± .30
[model code] [inches] [inches] [inches / millimeters]
075F * 0.75" 12" 11.2" (284mm)
10F * 1.00" 12" 11.2" (284mm)
125F * 1.25" 12" 11.2" (284mm)
15F * 1.50" 12" 13.2" (335mm)
20F ** 2.00" 12" 13.2" (335mm)
25F ** 2.50" 18" 13.2" (335mm)
30F ** 3.00" 18" 13.2" (335mm)
40F ** 4.00" 18" 13.2" (335mm)
60F ** 6.00" 24" 13.2" (335mm)

*Available in 316 stainless steel pipe only.

**Available in 316 stainless steel pipe or A106 grade B carbon steel pipe + A105 flanges.

Appendix | 122
 Model FT4X
Appendix

Fig. 7.10: Inline Meter with Flow Body and 300 lb. RF Flange End Connections Dimensions

8.1
(206)
4.6 4.3
(117) (109)

2x 3/4 inch
NPT Female 5.2
(132)
F1 F2 F3 F4

“H”

CL

“L” 2X FLANGE, RAISED FACE,

ANSI B16.5, 316 SST

Table 7.10: Inline Meter with Flow Body and 300 lb. RF Flange End Connections Dimensions

Body Size Body Size Dimension “L” ± .10 Dimension “H” ± .30
[model code] [inches] [inches] [inches / millimeters]
15G * 1.50" 12" 13.9" (353mm)
20G ** 2.00" 12" 13.9" (353mm)
25G ** 2.50" 18" 13.9" (353mm)
30G ** 3.00" 18" 13.9" (353mm)
40G ** 4.00" 18" 13.9" (353mm)
60G ** 6.00" 24" 13.9" (353mm)

*Available in 316 stainless steel pipe only.

**Available in 316 stainless steel pipe or A106 grade B carbon steel pipe + A105 flanges.

Appendix | 123
Model FT4X
Appendix

Fig 7.11: Inline Remote Meter with Flow Body and 300 lb. RF Flange End Connections Dimensions

3.6
(91)
4.4
(112)
2.0
(51)

4.6
(117)
4.5
2X 3/4" (114)
NPT,
5.2 Female
(132)
“HH”
F1 F2 F3 F4

Remote Cable,
18 gauge, 8 Conductor,
Shielded, 100FT Max.

CL

“L”

Table 7.11: Inline Remote Meter with Flow Body and 300 lb. RF Flange End Connections Dimensions

Body Size Body Size Dimension “L” ± .10 Dimension “HH” ± .30
[model code] [inches] [inches] [inches / millimeters]
15G * 1.50" 12" 13.2" (335mm)
20G ** 2.00" 12" 13.2" (335mm)
25G ** 2.50" 18" 13.2" (335mm)
30G ** 3.00" 18" 13.2" (335mm)
40G ** 4.00" 18" 13.2" (335mm)
60G ** 6.00" 24" 13.2" (335mm)

*Available in 316 stainless steel pipe only.

**Available in 316 stainless steel pipe or A106 grade B carbon steel pipe + A105 flanges.

Appendix | 124
 Model FT4X
Appendix

Warranty Statement and Terms and Conditions

Limited Warranty - All Products

Fox Thermal warrants that for a period of one year following the date of original shipment of Fox’s
products that the product will conform to Fox’s standard written specifications applicable to such
product and will be free from defects in workmanship. For more details, view the Limited Warranty
section in the Terms & Conditions of Sale. Find that document at this link:

https://www.foxthermal.com/pdf/terms-and-conditions.pdf

Consumable and Fragile Material Warranty

Fox warrants that consumable materials, supplied by Fox either as part of an instrument or system, or
separately, will be free from defects in material and workmanship at the time of shipment. A list of key
consumables and expected lifetimes may be found in the applicable Seller equipment operation and
maintenance manual.

Terms and Conditions of Sale

For more details about Fox’s warranty statement and exclusions, please download the Terms &
Conditions of Sale document. Find that document at this link:

https://www.foxthermal.com/pdf/terms-and-conditions.pdf

Appendix | 125
Model FT4X
Appendix

Returning Your Meter

The Fox Thermal Customer Service Department (Phone: 831- 384-4300 or Email: service@foxthermal.
com) can help you through the process of returning a meter for service.

If it becomes necessary to return a Fox Thermal flow meter for service or recalibration, please follow
these steps:

1. A Return Material Authorization (RMA) Number must be obtained from the Fox Thermal Customer
Service Department prior to returning any Fox Thermal meter(s).
2. Please have your meter’s serial number(s) available.
3. Read and complete the Fox Thermal RMA Customer Information Form. Be sure to initial the
decontamination statement as well as provide complete return shipping instructions (we cannot
deliver to post office boxes).
4. The entire flow meter must be returned, including all electronics (unless specifically instructed
to do otherwise). ALL serial numbers must match their corresponding meters. This is especially
necessary when returning flow body models.
5. Clean and decontaminate all wetted parts before returning to Fox Thermal.
6. Ship the meter to the following address:
Fox Thermal Instruments, Inc.
399 Reservation Road
Marina, CA 93933
Attn: Service Dept.
[RMA Number]

NOTE! Be sure to review all of the information on the Customer Information Form before
sending your meter to the Fox Thermal Customer Service Department. The Fox Thermal
Shipping/Receiving Department cannot accept meters that have not been prepared
appropriately.

Appendix | 126
 Model FT4X
Appendix

What to expect while your meter is being serviced

Depending on the type of service required when returning your Fox Thermal meter, there are varying
turnover times for servicing a meter. The average time needed to service the meter is 7-10 days (not
including shipping or peak production times).

If you have already shipped your meter to Fox Thermal for servicing and would like to check the status
of your meter, please fill out our online Service Order Status form located at www.foxthermal.com and
you will hear from a Customer Service Rep within 1 business day of your requested update.

Rush recalibration service is available for a fee. Restrictions apply.

Appendix | 127
Model FT4X
Appendix

Glossary of Terms and Definitions

AWG American Wire Gauge NIST National Institute of Standards

Bara Bar absolute and Technology
CTC Contact NL Normal Liter
CAL Calibration NLPH Normal Liter per Hour
CHG Change NLPM Normal Liter per Minute
COM Communication NM3 Normal cubic Meter
CSV Current Sense Voltage NM3/H Normal cubic Meter per Hour
DC Direct Current NM3/M Normal cubic Meter per Minute
DCS Distributed Control System NPT National Pipe Thread
DN Down PC Personal Computer
DSP Display P/U Pulse per Unit
ELP Elapsed time PIP A^2 Pipe Area
Feq Frequency PLC Programmable Logic
Ft^2 Square Feet Controller
I/O Input/Output PRM Parameters
INP Input PRS Pressure
LB Pound PSIA Pounds per Square Inch
LB/D Pound per Day Absolute
LB/H Pound per Hour Pt Point
LB/M Pound per Minute PSW Password
LB/S Pound per Second SIM Simulation
LCD Liquid Crystal Display SCF Standard Cubic Feet
KG Kilogram SCFM Standard Cubic Feet per
KG/H Kilogram per Hour Minute
KG/M Kilogram per Minute SCFH Standard Cubic Feet per Hour
KG/S Kilogram per Second SCFD Standard Cubic Feet per Day
M^2 Square Meter SPC Special Control
mmHG Pressure in millimeters of mercury STP Standard Temperature and
MMSCFD Million Standard Cubic Feet per Pressure
Day TMP Temperature
MS/TP Master-Slave/Token Passing TSI Internal Variable
MXFLO Maximum Flow TSV Internal Variable
NAESB North American Energy Standards Board UNT Unit
NEMA National Electrical Manufactures U/P Unit per Pulse
Association 420 4-20mA output

Appendix | 128
 Model FT4X
Appendix

Index

Access to Electronics, p. 33 Power Input Wiring, p. 36

Alarm Codes, p. 108 Preventative Maintenance, p. 99
Alarm wiring, p. 41 Product Description, p. 17
Analog 4-20mA output, p. 51 Programming
Breakage or Damage of Probe, p. 100 Analog 4-20mA Output, p. 51
CAL-V™, p. 110 Alarm Output, p. 54
Dimension Details, p. 114 Changing values or strings, p. 50
Discrete output setting, p. 54 Display Setup, p. 56
Display Screens, p. 49 Flow Parameters, p. 63
Display Setup, p. 56 Flow and maximum pulse/alarm, p. 54
Entering the programming mode, p. 50 Pulse/alarm Output, p. 53
Filter value, p. 50 Password, p. 61
Flow Meter Placement, p. 21 Programming Mode, p. 50
Flow Units, p. 61 Pulse-per-unit, p. 53
Pulse/alarm Output, p. 53 Reset CRC, p. 68
Fuse Replacement, p. 99 Selecting from a list, p. 50
Glossary, p. 128 Serial Communication, p. 55
Installation, Simulation, p. 69
Compression Fitting - Insertion, p. 33 Unit-per-pulse, p. 54
Lateral Placement, p. 21 Unit settings, p. 61
Mounting, p. 21 Using the Local Display, p. 50
Orientation of Meter - Insertion, p. 27 Replacements Fuses, p. 99
Introduction, p. 17 Return Procedure, p. 126
Level 2 password, p. 60 Sensor Cleaning, p. 99
Local Display, p. 19 Sensor Orientation, p. 27
Local Input Wiring, p. 36 Simulation Mode, p. 69
Mass Flow, p. 17 Theory of Operation, p. 17
Measurement Mode, p. 49 To program the display, p. 57
Menu Tree, Troubleshooting, p. 104
Digital Output, p. 9 Alarm Codes, p. 108
Display Menu, p. 12 General, p. 104
Engineering Display, p. 13 Installation Problems, p. 107
Gas-SelectX®, p. 14 USB Interface, p. 48
Main Menu, p. 8 Warranty, p. 125
Flow Menu 1, p. 10 Wiring
Flow Menu 2, p. 11 Alarms, p. 40
CAL-V™ Menu, p. 13 Pulse/Alarm Outputs, p. 40
Mounting meter, p. 21 Grounding, p. 35
Orientation of meter - Insertion type, p. 27 Input - Local, p. 36
Password Instructions, p. 33
Level 1, p. 57 Local meters, p. 36
Level 2, p. 57 Power Input, p. 36
Programming, p. 61 Precautions, p. 34

Appendix | 129
 Definition of Terms
Wiring

NOTE! is used for Notes and

Troubleshooting Tips Information

WARNING! is used to indicate a hazardous situation which, if not avoided, could

result in death or serious injury.

CAUTION! is used to indicate a hazardous situation which, if not avoided, could

result in minor or moderate injury.

Indicates compliance with the WEEE Directive. Please dispose of the product in
accordance with local regulations and conventions.

Indicates compliance with the applicable European Union Directives for Safety and
EMC (Electromagnetic Compatibility Directive 2014/30/EU).

Indicates compliance with the UKCA (UK Conformity Assessed) regulations for
Great Britain.

IP67
Enclosure Protection Classification per IEC 60529: Protected against the ingress of
dust and Immersion.

Make Downtime a Thing of the Past

THERMAL MASS FLOW METERS
NON-STOP PERFORMANCE

SALES@FOXTHERMAL.COM Phone
831.384.4300
Address
399 Reservation Road Worldwide
Marina, CA 93933 USA foxthermal.com