OPERATING INSTRUCTION MANUAL
MS SERIES
CONDUCTIVITY CELLS
REV. 3.0
AquaMetrix Inc.
1245 Maple Hill Court, Unit 7
Newmarket, ON
Canada, L3Y 9E8
Tel: (800) 742-1413
(905) 954-0841
Fax: (905) 954-0415
www.aquametrix.com
TABLE OF CONTENTS
1.0 GENERAL INFORMATION ........................................................................................ 1
1.1 Introduction ..................................................................................................................................................1
1.2 Cautions To Be Observed .......................................................................................................................... 1
2.0 SPECIFICATIONS ...................................................................................................... 2
3.0 PRINCIPLE OF OPERATION..................................................................................... 3
4.0 INSTALLATION .......................................................................................................... 4
4.1 Installation of Flow-Through Sensors ...................................................................................................... 4
4.2 Installation of Submersion Sensor............................................................................................................ 4
6.0 TROUBLESHOOTING AND SERVICE ...................................................................... 6
7.0 DRAWINGS ................................................................................................................ 7
7.1 N106-114 MS SERIES CONTACTING CONDUCTIVITY CELLS .............................................................. 7
7.2 N105-60 INSTALLATION OF MS SERIES CONTACTING CONDUCTIVITY CELLS.............................. 8
7.3 N105-61 ASSEMBLY OF MS SERIES CONTACTING CONDUCTIVITY CELLS COMPRESSION
FITTING.......................................................................................................................................................... 9
Page 1
MS SERIES CONDUCTIVITY CELLS
INSTRUCTION MANUAL
1.0 GENERAL INFORMATION
1.1 Introduction
1.1.1 This manual provides information on AquaMetrix Model MS Series flow-through and
submersion sensors. Conductivity sensors have long been called cells. The two
terms, cell and sensor, are used interchangeably in this manual.
1.2 Cautions To Be Observed
1.2.1 Consult the factory before using sensor in extremely strong solvents such as
ethylene dichloride. Also, do not exceed the sensor’s maximum ratings listed in
Section 2 of this manual.
1.2.2 Before placing sensor into service, remove protective plastic cap.
1.2.3 Do not exceed the maximum sensor-to-analyzer distance specified for the analyzer
you are using.
1.2.4 Be sure the cell constant is appropriate for the scaling of the analyzer. The constant
is given in the numerical part of the model number. For example, MS001P has a
constant of 0.01; MS1P has a constant of 1.
Page 2
2.0 SPECIFICATIONS
CELL CONSTANTS: 0.01 to 50
THREADED SIZE: 3/4” NPT
TEMPERATURE COMPENSATION: Automatic 0-120°C (32-248°F)
CABLE LENGTH: 4m (13ft)
INSERTION LENGTH: Variable (see Section 4.1.5)
WETTED MATERIALS:
MS_P: Graphite, Epoxy, EPDM, CPVC
MS_S: Graphite, Epoxy, Polypropylene, 316 stainless steel
SAFETY FEATURE: Shoulder on cells provides an integral
safety stop
TEMPERATURE and PRESSURE:
Type
Max. Press. (psi)
Max. Temp. (°C)
PS50
100
150
250
60
50
20
120
Page 3
3.0 PRINCIPLE OF OPERATION
3.1 All solutions containing water conduct electricity to some extent. The ability of the solution to
conduct electricity is called “conductance” (the reciprocal of resistance). Addition of
electrolytes such as salts, acids, or bases to pure water will increase the ability of the liquid
to conduct electricity and hence, increase the solution’s conductance (decreases the
resistance).
3.2 An electrolytic conductivity system measures solution conductance by using an analyzer
interconnected with cable to a sensor immersed in the solution. The conductivity sensor is
composed of two or more electrodes and a temperature sensor. The electrodes are in
contact with the solution. The analyzer circuitry impresses an alternating voltage between
the electrodes and the magnitude of the resulting current is linearly related to the solution
conductivity.
3.3 When the temperature of a solution changes, its conductivity changes. The temperature
change is compensated with a thermistor (temperature sensitive resistor) in the conductivity
sensor to alter the gain of the measuring circuit. This is accomplished such that, regardless
of actual solution temperature, the instrument display indicates what the solution
conductivity would be if the solution temperature was 25°C (an internationally accepted
reference).
Page 4
4.0 INSTALLATION
4.1 Installation of Flow-Through Sensors
Refer to Dwg# N105-60
4.1.1 Flow-through sensors are secured with the supplied compression fitting. The
insertion length is adjustable within the limits shown in DWG# N106-114. If your
sensor has a cross hole it must be inserted far enough to be sure the cross hole is
in the solution. Use thread sealant such as Teflon tape on the sensor and the
mounting hardware threads.
4.1.2 Install a 3/4” NPT tee into the process line. Tee material should be compatible with
sensor materials of construction for best chemical resistance and
pressure/temperature ratings. A 1” NPT tee with a 1x3/4” reducer may also be
used.
4.1.3 Electrically connect sensor to the instrument as described in Section 4.3.
4.1.4 Remove the protective cap from the sensor and calibrate the system as described
in the instrument operating instruction manual before installing sensor into the
mounting tee.
4.1.5 Screw sensor and fitting into the tee. Locate end of the sensor or cross hole in
sensor at the approximate center of the stream.
If you disassembled the cell be sure to re-assemble the components as shown in DWG#
N105-61
4.2 Installation of Submersion Sensor
Refer to Dwg# N105-60
4.2.1 Submersion sensors are designed for use in tanks, suspended from the top of the
tank. Mounting hardware, model MHMSC is available from AquaMetrix. It consists
of 3/4” CPVC pipe, 24” long with a cable clamp and a wire-mounting bracket.
4.2.2 Run the sensor cable through the desired length of 3/4” CPVC pipe and screw on
the cell using a thread sealant to keep the cable end of the sensor dry.
4.2.3 Electrically connect the sensor to the instrument as described in Section 4.3.
4.2.4 Remove the protective cap from the sensor and calibrate the system as described
in the instrument’s operating instruction manual before installing sensor in the tank.
4.2.5 Place the cell in the liquid and secure to the tank in an appropriate manner using
the wire bracket provided with MHMSC hardware.
Page 5
4.3 Electrical Connection
The sensor is electrically connected directly to the instrument or indirectly with a junction
box and interconnect cable. A suitable junction box with a terminal strip is available from
AquaMetrix (Model JB-1).
4.3.1 Direct Hook-Up
A. Route sensor cable to instrument.
B. Connect sensor cable lead wires in accordance with instrument hook-up
diagram.
Note: If you are using this conductivity cell with an AquaMetrix 2200C or 2100C
instrument, connect the four wires to the cell terminals, matching the colours.
If you are using it with an instrument, which accepts 3 wires, connect as follows:
- Join the black wire and green wire together and connect to the black terminal.
- Connect the red and the white as usual to their respective terminals. CAUTION:
If connecting to a GLI instrument, reverse the red and white wires.
- The shield is not required so there will be no connection to the SHEILD
terminal.
4.3.2 Indirect Hook-Up with Junction Box
A. Mount junction box with terminal strip (AquaMetrix Model JB-1) on flat surface
such that its cover is removable when installed.
B. Route sensor cable to junction box. Keep terminal strip dry to prevent problems
caused by wet and/or corroded terminals.
C. Route interconnect cable to junction box and instrument. It is recommended
that this cable be run in 1/2” metal conduit for protection against moisture and
mechanical damage.
Do not run line power in the same conduit with interconnect cable because
“electrical noise” may interfere with the sensor signal.
D. Connect sensor and interconnect cable lead wires by matching colours to the
junction box terminal strip. Fasten cover onto junction box.
E. Connect interconnect cable lead wires to instrument in accordance with
instrument hook-up diagram.
4.3.2 Wire Designations
White / Black: Electrodes
Red / Green: Thermistor (Temperature compensation)
Page 6
5.0 CLEANING THE SENSOR
5.1 Wipe the electrodes end with a soft cloth and rinse with clean water.
5.2 Clean the sensor electrodes in a soap solution using a soft cloth, brush, Q-tip or pipe
cleaner. If soap solution cleaning is unsuccessful, place the sensor electrode in 10% HCl
(hydrochloric acid) for 1 to 5 minutes to remove the contaminants that are acid soluble. Acid
clean only if absolutely necessary. Never use abrasive cleaners on the sensor or its
electrodes.
6.0 TROUBLESHOOTING AND SERVICE
6.1 Use the troubleshooting section in the analyzer instruction manual to determine whether the
sensor or analyzer is defective.
6.2 Should service, parts, assistance in troubleshooting or repairs be required, please contact
your AquaMetrix representative or the factory directly:
AquaMetrix Inc.
1245 Maple Hill Court, Unit 7
Newmarket, Ontario
L3Y 9E8 Canada
Tel: (800) 742-1413
(905) 954-0841
Fax: (905) 954-0415
Email: support@aquametrix.com
An RMA# is required for all returning items. Please contact AquaMetrix if you wish to send a
product for repair or evaluation. A description of the malfunction as well as the proper return
address should accompany all sensors returning for repair.
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