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4E-ConductivityMonitor
Model Q46C4

While the theory of monitoring conductivity is simple, in practice it can be very frustrating. While simple 2-electrode sensors
are inexpensive and can provide accurate data, continuous monitoring of even relatively clean water can foul the electrodes
and degrade the measurement. Maintaining accuracy is made more difficult when the amount of solids dissolved in the
process varies over a wide concentration range.

ATI’s Q46C4 4-Electrode Conductivity Monitor is the answer for monitoring almost any water-based process. Drinking water,
plating bath solutions, cooling water, process wash water, or virtually any other aqueous system can be monitored accurately and
reliably. The unique drive/control scheme used in the 4-electrode system allows a single sensor to be used in conductivity ranged
from 0-2000 μS to as high as 0-2,000 mS (0-2 S.) For chemical mixing applications, a concentration display can be selected.

Reliable Conductivity Measurement

with Self-Checking Sensor
HOW A 4-ELECTRODE SENSOR WORKS C
In a traditional 2-Electrode sensor, each electrode performs two functions. The electrodes
are used to carry the AC drive voltage and also measure the current flow due to the
conductivity of the water. This type of sensor has a limited conductivity range and is
affected by electrode coating. In addition, changes in cable resistance and capacitance
can cause measurement errors.

A 4-Electrode sensor provides two sets of electrodes, one set to carry the AC drive voltage
and a separate set to sense the strength of the electric field between electrodes. This
allows the drive voltage to be automatically adjusted for changes in electrode condition and
allows the monitor to automatically correct for the effects of electrode fouling. It also allows
the sensor to measure accurately over a very wide range of conductivity and eliminates
errors due to changes in cable length.

SENSOR CONFIGURATIONS
Sensors for the Q46C4 system are available in a variety of mounting configurations: convertible-style with 1” NPT
threads for pipe or tank mounting, 1-1/2” or 2” sanitary-style fittings in 316 stainless steel, and insertion-style for 1-1/4”
NPT hot-tap assemblies that allow the sensor to be removed from service without shutting down the process. For low
flow bypass applications, a Noryl sensor with quick-disconnect cable and acrylic flowcell are available.

Sanitary Sensor Convertible Sensor Insertion Sensor Flowcell Sensor

FEATURES
Adaptability. Concentration version for direct display of PID Output. Standard PID control function assignable to
chemical concentrations. one analog output.
Analog Output Options. Two isolated 4-20 mA outputs Digital Communications. Available in either Profibus-DP,
are standard, with an option for a third output if required. Modbus-RTU, or Ethernet-IP.
Default setting provides analog outputs for conductivity
and temperature. Relay Contacts. Three SPDT relays are standard, with
relay functions programmable for alarm, control, or trouble
Extra Outputs. Expansion board to add a third 4-20 mA indication. Three additional low power relays available as
analog output. an option.

Flexibility. Wide range capability, with selectable ranges of Flexible Mounting. NEMA 4X (IP-66) enclosure is
0-2000 μS up to 0-2.000 S, provides maximum application suitable for wall, pipe, or panel mounting.
flexibility.
Clear Display. Back-lit large LCD display provides clear
AC or DC Power Options. Power options include universal visibility in any lighting conditions. A scrolling second
100-240 VAC +/- 10% or 12-24 VDC. line on the display provides additional information and
programming prompts.
INSTALLATION
4-Electrode Conductivity sensors can be installed in a variety of ways,
including simple 1” pipe tees, union-mount pipe assemblies, sanitary pipe
clamps, and hot-tap insertion assemblies (CPVC or 316SS). The method
used will depend on specific application requirements.
Regardless of the mounting method, 4-Electrode sensors should always
be mounted so that the sensing electrodes at the tip of the sensor are no
closer than 2” to pipe or tank walls. It is best to have sample flow directed
at the sensor, but in all cases the sensor should not be mounted at the top
of a horizontal pipe run to avoid entrained air problems.

CONCENTRATION MONITOR
Conductivity monitors can be used to measure and display the concentration
of acids or bases used in various chemical process applications. The
Q46C4 is available with pre-loaded tables allowing direct display of
concentration for solutions of sodium chloride (NaCl), hydrochloric acid
(HCl), potassium hydroxide (KOH), and sodium hydroxide (NaOH).
WRONG!
In addition to these standard tables, the user may enter their own table
data for other chemicals, or may edit the standard tables supplied by ATI.
Custom tables require data on both concentration vs. conductivity and Correct Flow
temperature vs. conductivity for the chemical of interest.
 Q46C4 SPECIFICATIONS
ELECTRONIC MONITOR ORDERING INFORMATION
Display Range 0-2000 μS, 0-2.000 / 20.00 / 200.0 / 2000 mS, 0-2.000 S Model Q46C4-A-B-C-D-E-F 4-Electrode Monitor
Accuracy 0.5% of selected range Suffix A - Power
1 - 100-240 VAC, +/-10%, 50/60 Hz
Repeatability 0.3% of selected range 2 - 12- 24 VDC, (requires 300 mA)
Non-Linearity 0.1% of selected range Suffix B - Sensor Type
Temperature Drift 0.01% of span/°C 1 - Convertible, PEEK body
2 - Insertion, 316SS body
100-240 VAC +/- 10%, 50/60 Hz, 10 VA max. 3 - Sanitary-Style, 1½”, 316SS body
Power
12-24 VDC, 500 mA max. 4 - Sanitary-Style, 2”, 316SS body
Two isolated 4-20 mA, 500 Ω load max. 5 - Convertible, PEEK body with connector (requires 03-0029 cable)
Analog Outputs 6 - Noryl sensor with connector, for sealed flowcell 00-1522
(3rd output optional) (requires 03-0029 cable)
Three SPDT, contacts rated 6 amp @ 250 VAC, 5 amp @ 24 VDC Suffix C - Cable Length
Relays
(3 additional low power SPST non-isolated relays optional) 1 - 15’
2 - 30’
4 digit, 0.75” numeric LCD with 12 character second line, 9 - Special
Display
LED back light.
Suffix D - Digital Output
Enclosure NEMA 4X Polycarbonate V-0 Flammability 1 - None
Operating Conditions -20 to 60°C (-4 to 140°F) 2 - Profibus-DP
3 - Modbus-RTU
Weight 6 lbs. (2.7 kg) with Sensor 4 - Ethernet-IP
Sensitivity 0.05% of span Suffix E - Optional Output
Digital Output Profibus-DP, Modbus-RTU, or Ethernet-IP 1 - None
2 - One additional 4-20 mA output
Wall mounting kit standard, Panel mount bracket and 3 - Three additional low power relays
Mounting
pipe u-bolts available
Suffix F - Measurement Type
Size 5.6” W x 4.9” H x 6.4” D 1 - Conductivity
2 - Concentration
SENSOR ACCESSORIES
Sensor Type 4-Electrode
07-0100 Universal Junction Box, NEMA 4X
Materials PEEK with Titanium Electrodes 31-0057 Sensor Interconnect cable
Cable Length 15 ft (4.6 m) standard, 60 ft (18.3 m) max. with junction box 03-0029 Sensor Cable with Connector (25 ft)
00-0628 Mounting Bracket Kit for Submersible Sensor
Temperature Limits 0-125°C (14 to 257°F) 00-1522 Sealed Flowcell (60 PSI Max)
Pressure Limit 100 PSIG max. 05-0094 Panel Mount Bracket Kit
47-0005 2” U-bolt, 304SS
Connection 1” NPT for convertible-style 07-0203 Insertion Assembly without Assist, 1¼”NPT, 316SS
Flowcell Sensor 1-1/4” NPT with Quick Disconnect Cable 07-0228 Insertion Assembly with Assist, 1¼”NPT, 316SS
07-0223 Insertion Assembly without Assist, 1¼”NPT, CPVC
Temperature Element Pt1000 RTD 09-0047 Conductivity Standard - 447 mS, 500 mL
09-0048 Conductivity Standard - 1,500 mS, 500 mL
NOTES: 09-0049 Conductivity Standard - 8,974 mS, 500 mL
09-0050 Conductivity Standard - 80,000 mS, 500 mL
1 - Flow sensor used in sealed flowcell is Noryl. Temp limit is 70°C

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Analytical Technology, Inc. Analytical Technology Represented by:

6 Iron Bridge Drive Unit 1 & 2 - Gatehead Business Park
B / Q46C4 (4/15)

Collegeville, PA 19462 Delph New Road, Delph

Phone 610.917.0991 Saddleworth OL3 5DE
Toll-Free 800.959.0299 Phone 01457 873 318
Fax 610.917.0992 Fax 01457 874 468
Email sales@analyticaltechnology.com Email sales@atiuk.com