Omega Products CDE-600 Installation Manual

User’s Guide

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CDE-600/610

Conductivity Cells

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The information contained in this document is believed to be correct, but OMEGA accepts no liability for any
errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

TABLE OF CONTENTS

1.0 GENERAL INFORMATION .....................................................................................2

1.1 Introduction............................................................................................................................................ 2

1.2 Cautions To Be Observed .................................................................................................................... 2

2.0 SPECIFICATIONS ................................................................................................... 3

3.0 PRINCIPLE OF OPERATION..................................................................................4

4.0 INSTALLATION.......................................................................................................5

4.1 Installation of Flow-Through Sensors................................................................................................. 5

4.2 Installation of Submersion Sensor...................................................................................................... 5

4.3 Electrical Connection............................................................................................................................ 6

5.0 CLEANING THE SENSOR ......................................................................................7

6.0 TROUBLESHOOTING AND SERVICE ...................................................................7

7.0 DRAWINGS .............................................................................................................8

7.1 N106-157 CDE-600/610 SERIES CONTACTING CONDUCTIVITY CELLS ......................................... 8

7.2 N105-134 INSTALLATION OF CDE-600/610 SERIES CONTACTING CONDUCTIVITY CELLS..... 9

7.3 N105-135 ASSEMBLY OF CDE-600/610 SERIES CONTACTING CONDUCTIVITY CELLS

COMPRESSION FITTING ....................................................................................................................10

Page 1

CDE-600/610 SERIES CONDUCTIVITY CELLS

INSTRUCTION MANUAL

1.0 GENERAL INFORMATION

1.1 Introduction

1.1.1 This manual provides information on CDE-600/610 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, CDE-600-001 has
a constant of 0.01; CDE-600-1 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:

CDE-600: Graphite, Epoxy, EPDM, CPVC
CDE-610: Graphite, Epoxy, Polypropylene, 316 stainless steel

SAFETY FEATURE: Shoulder on cells provides an integral

safety stop

TEMPERATURE and PRESSURE:

Max. Press. (psi) Max. Temp. (°C)

Type

CDE-600

CDE-610

50
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# N105-134

4.1.1 Flow-through sensors are secured with the supplied compression fitting. The

insertion length is adjustable within the limits shown in DWG# N106-157. 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

sensor at the approximate center of the stream.

If you disassembled the cell be sure to re-assemble the components as shown in DWG#
N105-135

4.2 Installation of Submersion Sensor
Refer to Dwg# N105-134

4.2.1 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.

4.2.2 Electrically connect the sensor to the instrument as described in Section 4.3.

4.2.3 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.

4.2.4 Place the cell in the liquid and secure to the tank in an appropriate manner.

of the sensor or cross hole in

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
OMEGA (PHE-600-JB).

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 OMEGA instrument, connect the four

wires to the cell terminals, matching the colors.

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 (PHE-600-JB) 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.

Page 7

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a
period of
grace period to the normal
ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service
Department will issue an Authorized Return (AR) number immediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
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limited to contact points, fuses, and triacs.

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13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month

one (1) year product warranty to cover handling and shipping time. This

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FOR

WARRANTY RETURNS, please have the
following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which the product

was PURCHASED,

2. Model and serial number of the product under

warranty, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords
our customers the latest in technology and engineering.

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© Copyright 2005 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,

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for current repair charges. Have the following
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of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems
relative to the product.

consult OMEGA

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