THERMAL FLOW SENSOR TFS – 35

For limit and continuous flow rate sensing

of liquid media and for monitoring of their
temperature

• These sensors are intended for installation in pipes,

in which the actual flow rate and temperature occurs
• Flow rate measurement is shown in a bar graph by five
green LED diodes and in the same graduation it is possible
to select the limit for output switching (unswitching)
• Optical indication of the flow rate and temperature status
via two LEDs
• Can be selected either 1x current output 4..20 mA
and 1x limit PNP output, or 2x limit PNP output
• Settings provided by magnetic pen
• Stainless steel case

Thermal flow sensor - TFS–35 is a compact measuring device intended for industrial use for flow rate sensing of liquid media
and for monitoring of their temperature when installed in a pipe. The sensor may be installed in plastic or metal pipes. Suitable
for monitoring filling, cooling or lubricating media and their temperatures. Flow rate is indicated by means of a bar graph (5 green
LEDs). Output (flow rate and temperature) switching indicator by means of LED (orange and yellow).
Simple configuration using a magnetic pen. Sensor is made in a stainless steel design. Quick and simple installation thanks to
simple construction.

Dimensional drawing

TFS – 35_– 10 TFS – 35_– 11

Cable terminal

End of sensor

Sensor housing

Measuring stem

TFS-35-dat-1.9
Provedení „A“ s krátkou Provedení "B" s plastovou Provedení "C"
nerezovou vývodkou závitovou vývodkou s konektorem M12

Provedení „V“ s plastovou vývodkou se spi- Provedení „H“ s vývodkou pro ochranné
rálovým odlehčením - pro případ zvýšeného hadice - pro použití ve venkovním prostředí
mechanického namáhání kabelu nebo v místě zvýšené vlhkosti.

ochranná
Spirálové odlehčení hadice
(ø 13 mm)

TFS-35-dat-2.9
Technical specifications

Basic technical data

Working area (EN 60079-10-1) no explosive hazard area
Supply voltage 12 ... 34 V DC
60mA for supply voltage U = 24V DC
70mA for supply voltage U = 18V DC
TFS-35N-_-_-PFPT-_
80mA for supply voltage U = 15V DC
Current 100mA for supply voltage U = 12V DC
consumption 60mA for supply voltage U = 24V DC + current loop
TFS-35N-_-_-IFPT-_ 70mA for supply voltage U = 18V DC + current loop
TFS-35N-_-_-IFPF-_ 80mA for supply voltage U = 15V DC + current loop 100mA for supply
voltage U = 12V DC +current loop
2 x transistor PNP with open collector
TFS-35N-_-_-PFPT-_ (Switching current - max. 300 mA,
Residual voltage-ON state - max.1,5V)
Output 1 x transistor PNP with open collector
TFS-35N-_-_-IFPT-_ (Switching current - max. 300 mA,
TFS-35N-_-_-IFPF-_ Residual voltage-ON state - max.1,5V)
1 x active current output 4 .. 20 mA.
800 Ω for supply voltage U = 24V DC
Maximal resistance of current output load 500 Ω for supply voltage U = 18V DC
200 Ω for supply voltage U = 12V DC
Indication of incorrect settings 3,75 mA at current output + indication of bargraph
Maximum switching current 300 mA
Maximum residual voltage in ON state 1,5 V
Temperature output - switching points 15 °C; 30 °C; 45 °C; 60 °C; 75 °C
Flow rate range 1 to 150 cm/s (for water)
Temperature gradient < 250 K/min
Isolating capacity (housing - inputs) / electrical strength 4 nF / 350 V AC
IP67 (variant C)
Protection
IP68 (variant A, B, V, H)
Ambient working temperature range (ta) -20 ... +80°C
Cable PVC 4x 0,5 mm2
Heat up time after start 10s
Response time 2 to 15s *1)
Pressure strength 10 MPa ( 100 bar ) over full temperature range
Weight of sensor (without cable) 150 g

*1) Depending on the flow rate and setting of the sensor.

Used materials
part of the sensor type standard material
Housing (including measur. stem) all stainless steel W.Nr. 1.4404 (AISI 316L)
End of sensor all stainless steel W.Nr. 1.4301 (AISI 304)
TFS–35_–_ _- _- _ _ _ _- A- L_ _ stainless steel W.Nr. 1.4571 / NBR
TFS–35_–_ _- _- _ _ _ _- B- L_ _ plastic PA / NBR
Cable terminal
TFS–35_–_ _- _- _ _ _ _- V- L_ _ plastic PA / NBR
TFS–35_–_ _- _- _ _ _ _- H-L _ _ plastic PA / NBR
Connector M12 TFS–35_–_ _- _- _ _ _ _- C-L _ _ nickel-plated brass

Process connection
name dimensions marking
pipe thread G 1/2'' G 1/2

TFS-35-dat-3.9
Electrical connection

Electrical connection can only be made in a voltage-free state!

A sensor with PNP type of outputs can be loaded only by resistive or inductive loads. The positive pole of the supply voltage (+U)
is connected to the brown wire BN or pin connector no.1, the negative pole (0 V) is connected to the blue wire BU or pin connector
no.3. Flow rate load on the black wire BK or pin connector no.4 and temperature load on the white wire WH or pin connector no.2.
The capacitative loads and low resistance loads (e.g. bulb) are evaluated by the sensor as a short circuit.
Wiring diagrams are provided in the figures below.
Flow sensor TFS-35 with a type A, B, V or H cable terminal, is connected to the assessment units permanently by a connection cable,
see. Dimensional drawings.
The TFS-35 flow sensor with connection method type C (see Dimensional drawings) is connected to the assessment units by means
of a connector socket with a pressed-in cable, or by means of a detachable connector socket without a cable (e.g. ELWIKA), see
accessories. In this case the cable is connected to the inside pins of the socket according to the figure below. The recommended
diameter of this cable when using ELWIKA connectors is 4 to 6 mm (the recommended wire cross-sectional area is 0.5 to 0.75 mm2).

Connection of flow sensor TFS-35_-_-_-PFPT Connection of flow sensor

TFS-35_-_-_-IFPF and TFS-35_-_-_-IFPT

Connection of outputs in variant PFPT Connection of outputs in variant IFPF (IFPT)

Limit flow rate output - black wire of cable (BK), Analog flow rate output - white wire of cable (WH),
- or pin 4 of connector. - or pin 2 of connector.
Limit temperature output - white wire of cable (WH), Limit flow rate (temper.) output - black wire of cable (BK),
- or pin 2 of connector. - or pin 4 of connector..

0V Limit temperature output 0V Analog flow rate output

+U Limit flow rate / +U

Limit flow rate output temperature output
Connector of flow sensor TFS-35_-_-_-PFPT Connector of flow sensor
TFS-35_-_-_-IFPF and TFS-35_-_-_-IFPT
Limit flow rate /
Limit flow rate output (BK)
temperature output (BK)

+U (BN) 0V (BU) +U (BN) 0V (BU)

Legend:
Limit temperature
BN – brown output (WH) Analog flow rate output (WH)
WH – white
BK – black Inside view of the connector socket Inside view of the connector socket
BU – blue (variant "C-PFPT") (variant "C-IFPF(P)")

Settings

BARGRAPH
Settings are performed by placing the magnetic pen on to the sensitive spot (green LED)
marked "T" or "F" located between the LEDs. In this way, the minimum and TEMPERATURE OUT FLOW OUT
(yellow LED) (orange LED)
maximum flow rate, flow rate switching point, temperature switching point,
switching modes (O, C) are set or the factory setting are restored. An incor-
rect setting is indicated by the green LEDs gradually turning on and off, going
from the centre to the edges.
Information on settings of the sensor is provided in the user's manual.

TFS-35-dat-4.9
Function and status indication

signal colour function

Flow rate output status indicator

permanently shine - output is switched
dark - output is unswitched
"FLOW OUTPUT" orange
Maximum flow rate setting
light with gradual lighting of green LEDs - maximum flow rate is being set
3 flashes - confirmation that settings are saved

Flow rate indicator

gradual lighting up of LEDs from left to right - depending on the flow rate range settings
"BARGRAPH" incorrect setting - gradual turning on and off, going from the centre to the edges
green
( 5 LED ) Flow rate / temperature switching point settings
one LED is permanently shine - when this point is reached, the flow rate / temperature output is switched
/ unswitched

Temperature output status indicator

permanently shine - output is switched
"TEMPERATURE dark - output is unswitched
yellow
OUTPUT" Minimum flow rate setting
light with gradual lighting of green LEDs - maximum flow rate is being set
3 flashes - confirmation that settings are saved

Order code

PRODUCT
TFS-35
PERFORMANCE
N non-explosive areas

TYPE OF STEM
10 bare cylindrical
11 bare cylindrical extended length

PROCESS CONNECTION
G½ pipe thread G 1/2

TYPE OF OUTPUT
1. output – Limit flow rate output (transistor PNP with open collector)
PFPT
2. output – Limit temperature output (transistor PNP with open collector)
1. output – Limit flow rate output (current 4 .. 20 mA)
IFPF
2. output – Limit flow rate output (transistor PNP with open collector)
1. output – Limit flow rate output (current 4 .. 20 mA)
IFPT
2. output – Limit temperature output (transistor PNP with open collector)

CONNECTION METHOD
A stainless steel press-in terminal (+ cable length)
B plastic threaded terminal (+ cable length)
C connector (socket not included with sensor, recommended type - see accessories)
V plastic terminal with a spiral (+ cable length)
H plastic terminal for protective hose (+ cable length)

STEM LENGTH (in mm)

L20 20 mm, cannot be used for type 11
L50 50 mm, cannot be used for type 10

CABLE
K cable length in m

TFS-35 N - 10 - G½ - PFPT - A - L20 K2m CODE EXAMPLE

TFS-35-dat-5.9
Correct specification examples

TFS–35N-10-G1/2–PFPT–A-L20 cable 2 m
(N) configuration for normal areas; (10) non-insulated cylindrical; (G1/2) process connection with thread G1/2"; (PFPT) PNP type flow rate and temperature
sensing terminals; (A) stainless steel cable terminal; (L20) length of stem 20mm; cable 2 m.
TFS–35N-10-G1/2–PFPT–C-L20
(N) configuration for normal areas; (10) non-insulated cylindrical; (G1/2) process connection with thread G1/2"; (PFPT) PNP type flow rate and temperature
sensing terminals; (C) M12 connector; (L20) length of stem 20mm.
TFS–35N-10-G1/2–PFPT–B-L20 cable 12 m
(N) configuration for normal areas; (10) non-insulated cylindrical; (G1/2) process connection with thread G1/2"; (PFPT) PNP type flow rate and temperature
sensing terminals; (B) plastic cable terminal; (L20) length of stem 20mm; cable 12 m.

Accessories

standard - included in the flow sensor price optional – for a surcharge (see catalogue sheet of accessories)
• 1 pcs. magnetic pen MP-8 • cable (over the standard 2m length)
• connector socket (type ELWIKA or ELKA)
• standard steel or stainless steel welding flange
• protective hose (for type of cable terminal H)
• stainless steel fixing nut
• various types of seals (PTFE, Al, etc.)

Safety, protection and compatibility

The flow sensor TFS–35 is equipped with protection against voltage polarity reversal, protection against current overload and
protection against short term overvoltage.
Protection against dangerous contact is provided by low safety voltage according to 33 2000-4-41.
Electromagnetic compatibility is provided by conformity with standards EN 55011 / B, EN 61326-1, EN 61000-4-2 (8 kV), -4-3 (10
V/m), -4-4 (2 kV), -4-5 (1 kV) and -4-6 (10 V).

Packaging, shipping and storage

The TFS-35 device is supplied packaged in a cardboard box that protects it against mechanical damage.
When handling and during transport, it is necessary to prevent impacts and falls.
The TFS-35 electrical device must be stored in dry enclosed areas with humidity up to 85%, free of aggressive vapours at tem-
peratures between -10°C and 50°C, and must be protected against the effects of weather.
version 08/2020

TFS-35-dat-6.9
Dinel, s.r.o. Phone: +420 577 002 003 sale@dinel.cz
U Tescomy 249 www.dinel.cz
760 01 Zlín, Czech Republic