Omega Products CDCN-90A Installation Manual

Chapter Page
1 Introduction 1

1.1 General Description 1

1.2 Front Panel Description 2

1.3 Rear Panel Description 3

2 Sensor Selection and Installation 4

2.1 Sensor Selection 4

2.2 In-Line Sensor Installations 6

2.3 Submersible Sensor Installations 8

3 Installation and Wiring 9

3.1 Mounting Instructions 9

3.2 Power Connections 10

3.3 Input Connections 11

3.4 Output Relay Connections 12

3.5 Verifying Analog Outputs 13

3.6 Analog Output Connections 14

4 System Configuration 15

4.1 Introduction 15

4.2 CAL Menu Functions 16

4.3 RELAY Menu Functions 18

4.4 OUTPUT Menu Functions 19

4.5

4.6 CAL Menu 22

4.7 Wet Calibration Procedure 24

4.8 Relay Operation 25

4.9 RELAY Menu 27

4.10 OUTPUT Menu 29

4.11 View Only Menus 30

Quick-Reference Keypad Sequence

20

Table of
Contents

5 Technical Support 32

5.1 Accessing Internal Options 32

5.2 AC Power Configurations 33

5.3 Security Code Function 33

5.4 Installing Input/Output Options 34

5.5 Output Card Configurations 34

5.6 Options and Accessories 35

5.7 Parts Per Million Conversion Factor 36

5.8 Temperature Coefficient 37

5.9 Troubleshooting 39

Specifications 42

Warranty Information 45

Important Safety Information!

CAUTION: Remove AC power to unit prior to

wiring input and output connections.

CAUTION: Remove AC power before opening
unit. Electrical shock hazard exists

Unpacking and Inspection

Your controller package includes the following
items:

• OMEGA CDCN-90A Conductivity/Resistivity
Controller

• Two stainless steel mounting brackets

• Mounting Instructions w/self-adhesive template

• Panel gasket

• Instruction manual w/warranty card

Please fill out and return warranty card as soon as
possible.

Warranty Record

For your protection, record your unit's purchase
date and serial number for future reference. The
serial number decal is located on the instrument's
rear panel.

Model: OMEGA CDCN-90A Conductivity/

Resistivity Controller

Purchase Date: _______________________

Serial Number: ________________________

Purchased From: _______________________

Purchase Order Number: _______________

1.1 General Description

The OMEGA CDCN-90A Conductivity/Resistivity
Controller is specifically designed to monitor and
control conductivity levels of aqueous solutions.
The controller's compact 1/4 DIN enclosure (front)
is NEMA 4X/IP65 rated and ideal for installations
into instrumentation panels with limited space.

Optional "plug-in" output cards allow you to
customize your controller to satisfy your application
demands. The controller's unique "slide-out"
chassis design makes option installation fast and
simple. Smart self-configuring microprocessor
based circuitry automatically inventories installed
options during power-up, allowing you to upgrade
your system in seconds without the need for
additional equipment.

The unit's front panel features a highly visible

4.5 and 8-digit liquid crystal display with
adjustable contrast. Measured conductivity/
resistivity and relay status is accessed at a glance.
Channel selection and solution temperature is
accessed with a touch of a button. During
calibration the user is prompted with clear
step-by-step instructions on the front panel display.

Chapter 1

Introduction

The CDCN-90A is designed for use with OMEGA
CDCE-90 series conductivity/resistivity sensors,
covering a wide range of conductivity/resistivity
measurement. Each sensor is equipped with a
PT1000 temperature compensation device for
accurate temperature sensing (sec. 2.1).

The technical data given in
this publication is for general
information purposes only. It
implies no warranty of any
kind.

1

1. Relay
Annunciators:

1.2 Front Panel Description

CONDUCTIVITY/RESISTIVITY CONTROLLER

RLY 1
RLY 2

1

RLY 3
RLY 4

2

4

5
6

ENTER MOD

CAL RELAY OUTPUT

FunctionItem

• Indicate activation status of control relays 1-4 (optional)

COND
RES

% REJ

TEMP

®

103

9

8
7

2. LCD
Display:

3.

4.

5.

6.

7.

8.

9.

10.

2

MOD

ENTER

CAL

RELAY

OUTPUT

TEMP

% REJ

COND
RES

• Shows conductivity, resistivity, temperature °C, relay activation status, and
user messages during setup and operation

• Accesses one of three calibration menus: CAL, RELAY, OUTPUT

• Selects a menu item for modification

• Restores a menu item to previous value during modification

• Stores calibration and setup values into memory after modification

• Displays available output options during operation

• Used in conjunction with MOD key to access the CAL calibration menu

• Accesses the CAL "view-only" menu

• Used in conjunction with MOD key to access the RELAY calibration menu

• Accesses the RELAY "view-only" menu

• Used in conjunction with MOD key to access the OUTPUT calibration menu

• Accesses the OUTPUT "view-only" menu

• Displays temperature in °C for each channel during operation

• Decreases the value of a selected digit in CAL, RELAY, or OUTPUT menus

• Displays percent rejection between channels

• Increases the value of a selected digit in CAL, RELAY, or OUTPUT menus

• Displays conductivity/resistivity for each channel during operation

• Selects a digit for modification while in CAL, RELAY, or OUTPUT menus

• Returns the unit to operation mode from menus

1.3 Rear Panel Description

10 9 8 7 6

RLY3

RLY4

C NO Tx GND Rx

1 2 3 4 5 6 7 8 9 10 11 12 13 14

R+ R-

SERIALANL2

CH2

S2 T2

CH1

S1 T1 SG CNO

Note:

Rear terminals accept

18 to 22 AWG wire

15 16 17 18 19 20 21 22 23 24 25 26 27 28

L1

N

AC IN

Function

1

• 90 to 132 VAC or 180 to 264 VAC system power

NO C NC

+ GND

RLY1DC IN

2 3 4

NO C NC

RLY2

R+ R-

ANL1

5

Item

1. AC IN

connection

• 17 to 30 VDC system power connection

• Relay #1 (COM, NO, NC) contact set for external device

2. DC IN

3. RLY1

control (optional)

• Relay #2 (COM, NO, NC) contact set for external device

4. RLY2

control (optional)

• Analog output #1 from option socket #1 (optional) 5. ANL1

• Sensor input connections

• Serial outputs (future availability)

• Analog output #2 from option socket #2 (optional)

• Relay #4 (COM, NO) contact set for external device
control (optional)

• Relay #3 (COM, NO) contact set for external device
control (optional)

6. CH1/CH2

7. SERIAL

8

. ANL2
. RLY4

9

10. RLY3

3

Chapter 2

Sensor Selection
and Installation

Dimensions:

• CDCE-90-001 Sensor

• CDCE-90-01 Sensor

• CDCE-90-1 Sensor

4.6 m (15 ft.)

cable (standard)

152 mm
(6.0 in.)

Reversible
fitting assy
for submersion
mounting

3/4 in. NPT
(standard)

2.1 Sensor Selection

The CDCN-90A controller is compatible with
CDCE-90 series sensors. OMEGA Engineering
offers five sensor versions satisfying a wide range
of measurement, listed below.

For optimum sensor performance and life, the
following requirements MUST be met:

• Verify your system's conductivity/resistivity
range.

• Verify the maximum pressure/temperature
specification for the sensor under consideration
is within your process range.

• Verify wetted sensor parts are chemically
compatible with process fluids (e.g. Compass
Corrosion Guide or equivalent).

Choose the OMEGA Engineering sensor best
suited for your application from the following:

Order NPT Fitting
Number Cell Range Fitting Material

CDCE-90-001 0.01 0.055 - 100 µS 3/4 in. PP

(10 kΩ-18 MΩ
CDCE-90-01 0.1 1 - 1000 µS 3/4 in. PP
CDCE-90-1 1.0 10 - 10,000 µS 3/4 in. PP

Specifications

Temperature Compensation: PT1000

)

107 mm
(4.2 in.)

12.7 mm
(0.5 in.)

4

CDCE-90-01

sensor tip

CDCE-90-1

sensor tip

Wetted materials:
O-rings: EPR
Insulator: Teflon®
Electrodes: 316 stainless steel
Standard fitting: Polypropylene
Max. pressure: 100 psi/6.9 bar
Max. temperature: 212 °F/100 °C
Optional fitting: 316 SS (1/2 in. NPT)

#3-2820.392
Max. pressure: 200 psi/13.8 bar
Max. temperature: 248 °F/120 °C

Resistivity measurements within the 10 MΩ to

18 MΩ (0.055 µS to 0.1 µS) range must be
performed in solution temperatures from
20 °C to 100 °C.

Order NPT Fitting
Number Cell Range Fitting Material

CDCE-90-10 10.0 100 - 100,000 µS 3/4 in. 316 SS

Specifications

Temperature Compensation: PT1000
Wetted materials:

O-rings: EPR
Insulator: CPVC
Electrodes: 316 stainless steel
Standard fitting: 316 SS
Max. pressure: 100 psi /6.9 bar
Max. temperature: 203 °F /95 °C

Optional Submersion
Adapter Fitting: 316 SS, #3-2820.390

Plastic pipe/tank installations: When two CDCE-90-10
sensors connected to the same controller, a minimum of
10 ft/3 m is required between sensors, if placed in the
same solution.

Metal pipe/tank installations: A CDCE-90-10 will not work
with a CDCE-90-20 sensor in the same system. Use two
CDCE-90-20 sensors in these applications.

Dimensions:

CDCE-90-10 Sensor

15 ft./4.6m

cable (standard)

5.8 in./
147 mm

3.4 in./
86 mm

0.75 in.

Standard 3/4 in.
NPT/316 SS fitting

Optional 316 SS
submersion adapter
fitting - 3/4 in. NPT
threads,
#3-2820.390

19 mm

5

Dimensions

CDCE-90-20 Sensor

15 ft./4.6 m

cable (standard)

8.0 in./
203 mm

3.5 in./
89 mm

Reversible
fitting assy
for submersion
mounting

3/4 in. NPT

Order NPT Fitting
Number Cell Range Fitting Material

CDCE-90-20 20.0 200 - 400,000 µ S 3/4 in. 316 SS

Specifications

Temperature Compensation: PT1000
Wetted materials:

O-rings: EPR
Insulator: Teflon
Electrodes: 316 stainless steel
Fitting: 316 stainless steel
Max. pressure: 100 psi/6.9 bar
Max. temperature: 302 °F/150 °C

0.75 in.

19 mm

2.2 In-line Sensor Installations

OMEGA CDCE-90 series sensors are easily
mounted using standard female pipe fittings
available at local hardware stores.

For optimum system performance, several mounting
techniques must be observed. In-line applications
require special considerations unlike most
submersible types. Factors such as air bubbles,
"dead zones", excessive flow rates, and sediment
buildup are problems associated with pipeline
installations.

Air bubbles around the sensor electrodes can
cause the sensor to read lower conductivity values
than actual. Pockets or "dead zones" may
produce inaccurate reading since they isolate the
sensor from the main process stream.

6

Oils or sediments in the system can coat or clog
the sensor electrodes, causing poor response or no
response at all.

Mount the sensor in a location where the flow rate
is moderate. Ideally, the sensor should be
mounted where flow is directed into the sensor
cavity (e.g. elbow, tee).

Refer to the following illustration for recommended
mounting techniques.

CDCE-90-001
CDCE-90-01
CDCE-90-1
CDCE-90-10
CDCE-90-20

In-line

tee fitting

CDCE-90-001
CDCE-90-01
CDCE-90-1
CDCE-90-10
CDCE-90-20

A

CDCE-90-1

A

OR

B

B

Use caution to avoid air bubble or
sediment trapping inside the electrode
cavity.

• Refer to your sensor instruction manual for
specific sensor assembly and mounting instructions.

• For other installations, contact your local
Omega Engineering distributor for additional
information.

Submersible

Air
bubbles

Air
bubbles

• After the sensor is first installed and the pipe is
filled with fluid, gently tap the sensor fitting several
times to release any air bubbles trapped within the
sensor cavity.

7

2.3 Submersible Sensor Installations

1

2

6

customer
supplied
pipe

customer
supplied
female
pipe
union

15 ft/4.6 m
cable std.
100 ft/30 m
max.

5

3

4

Sealant

Sealant

OMEGA CDCE-90-001, CDCE-90-01, and CDCE-90-1
sensors are easily modified for submersible installation. An
extension pipe and female pipe union are required (customer
supplied).

• CDCE-90-10 sensor: this sensor can be submersed via the
optional submersion adapter fitting #3-2820.390.

• CDCE-90-20 sensor: conversion for submersion mounting
is similar to the illustration above. Simply reverse the
sensor's metal swedgelock fitting assembly and refer to
step #6 above.

• Shake the sensor/pipe assembly after submersion to
remove any trapped air bubbles inside the electrode
cavity. Aerated tanks may require baffles to separate the
sensor from bubble streams. Avoid mounting locations
where bubbles are present.

8

3.1 Mounting Instructions

The controller's 1/4 DIN enclosure is specifically
designed for panel mounting. Adjustable mount­ing brackets allow mounting in panels up to 1 in./
25 mm thick. An adhesive template and instruc­tions are included to insure proper installation.

For outdoor and/or stand alone installations the
splash-proof NEMA 4X/IP65 rear cover kit is
recommended (ordered separately,
PHOR-9RC).

Chapter 3

Installation
and Wiring

Panel
Gasket

3.8 in. sq.
96 mm

Mounting Panel
Max. panel thickness = 1 in./25 mm

Mounting Clamp (included, 2 ea.)

SIDE VIEW

5.7 in./145 mm
6 in./152 mm

*Optional NEMA 4X/IP65 Rear Cover

6.5 in./165 mm

Panel Cutout Instructions

Recommended panel cutout 3.54 in./90 mm
square. Maximum panel cutout 3.62 in./92 mm
square, DO NOT exceed. Use adhesive backed
template (included).

7.2 in./183 mm

90 mm X
90 mm

3.5 in.
88 mm

Panel cutout

9

Caution: Never connect live

L

1

N

AC IN

+ GND

NO C NC

RLY1DC IN

NO C NC

RLY2

R+ R-

ANL1

17 to 30 VDC @ 0.5 A

GND

15 16 17 18 19 20 21 22 23 24 25 26 27 28

*

15 16 17 18 19 20 21 22 23 24 25 26 27 28

L1

N

AC IN

+ GND

NO C NC

RLY1DC IN

NO C NC

RLY2

R+ R-

ANL1

90 to 132 VAC

OR

180 to 264 VAC

AC Hot
AC Ground*

AC Neutral

AC lines to the instrument.
Electrical shock hazard exists

3.2 Power Connections

AC Power Connections

DC power is recommended
when ground fault interrupt
devices (GFI's) are used.

Instructions

1. Jumper selectable for 90 to 132 OR 180 to 264 VAC
operation. Confirm AC power configuration before
applying power (sec. 5.2).

2. DC power can be connected simultaneously as a
backup power source, see section below.

3. *A direct or low impedance AC ground (earth ground)
MUST be used for proper operation.

4. To reduce the possibility of noise interference, AC
power lines must be isolated from signal lines.

DC Power Connections

Caution: Never connect live
DC lines to the instrument.
Electrical shock hazard exists

Note: AC/DC power can be connected simultaneously,
using DC power as an backup power source.

*A direct or low impedance earth ground must be used for
optimum performance

10

3.3 Input Connections

The CDCN-90A is compatible with
CDCE-90 series sensors. Wiring connections are
identical for ALL sensor versions.

Extended Cable Runs: Each sensor includes
15 ft/4.6 m of cable. Cable runs can extend up
to 100 ft/30 m using three conductor shielded
cable.

• Shielding must be exactly as shown below

• Shielding must be maintained through cable
splice with cable extensions.

OMEGA

Caution: Remove instrument
power prior to making any
input/output connection.
Failure to do so may result in
personal injury or damage to
the instrument.

Sensors:
CDCE-90-001
CDCE-90-01
CDCE-90-1
CDCE-90-10
CDCE-90-20

RLY3

C NO Tx GND Rx

1 2 3 4 5 6 7 8 9 10 11 12 13 14

RLY4

R+ R-

CH 2

CH 1

SERIALANL2

RED
WHITE
BLACK

CLEAR (SHLD)

RED
WHITE
BLACK
CLEAR (SHLD)

Special Considerations:

To reduce the possibility of noise interference, separate sensor
input lines from AC power lines.

CH2

S2 T2

CH1

S1 T1 SG CNO

11

3.4 Output Relay Connections

L

1

AC IN

+ GND

NO C NC

RLY1DC IN

NO C NC

RLY2

R+ R-

ANL1

External
AC/DC
Power
Source

15 16 17 18 19 20 21 22 23 24 25 26 27 28

N

AC+

AC+

ACN

ACN

AC+

B

pump

solenoid

valve

A

Up to two optional relay cards can be installed for
external device control. Each card contains two
independent relays controlled by either channel.
One of three relay modes are selected for each
relay (sec. 4.8). Relay contacts are rated at 5 A
maximum.

The CDCN-90A will accept one of each of the
following cards:

• 2-Relay Card: Provides two single pole double
throw relays (sec. 5.4).

• Dual Proportional Relay Card: Provides two
single pole single throw relays (sec. 5.4).

The 2-Relay Card provides both normally open
(NO) and normally closed (NC) contacts which
may be used simultaneously. Example: Device A
IS powered when relay 1 is off. Power is discon­tinued when relay 1's alarm setpoint is reached.
Device B IS NOT powered when relay 1 is off.
Power is applied when relay 1's alarm setpoint is
reached, see illustration below:

Special Considerations:

Relay contacts are rated as
5 A @ 250 VAC OR
5 A @ 30 VDC max.

An external heavy-duty relay
must be used for devices with
surge currents or operating
currents that exceed 5 A.

To reduce the possibility of
noise interference, separate
AC relay lines from input/
output lines.

12

The Dual Proportional Relay Card provides a
normally open (NO) contact for external device
control. The main distinction from the 2-Relay card
is the lack of the normally closed (NC) contact.
Example: Device A IS NOT powered when relay
3 is off. Power is applied when relay 3's alarm
setpoint is reached. Relay 4 operation is identical
to Relay 3, see illustration below:

RLY3

C NO Tx GND Rx

1 2 3 4 5 6 7 8 9 10 11 12 13 14

RLY4

R+ R-

+

SERIALANL2

Device B

CH2

S2 T2

-

CH1

S1 T1 SG CNO

-

External
AC/DC

+

Power

+

Device A

-

Source

-

External

+

AC/DC
Power
Source

3.5 Verifying Analog Outputs

Installed output options can be configured to either
of the unit's rear analog output terminals: ANL 1
or ANL 2. Configuration is determined by which
sockets the options are installed. Options installed
in socket #1 are configured to the rear ANL 1
terminals, options installed in socket #2 are
configured to the rear ANL 2 terminals (sec. 5.4).

Special Considerations:

Relay contacts are rated as
5 A @ 250 VAC OR
5 A @ 30 VDC maximum.

To reduce the possibility of
noise interference, separate
AC relay lines from input/
output lines.

Prior to connection, determine which options are
configured to terminals ANL 1 and ANL 2 as
follows:

13

Option Record:

1. Apply power to unit. Press:

ENTER

to view

ANL 1=
_____________________

ANL 2=
_____________________

Analog

Ouput #2

Analog

Output #1

available output options on the front panel display
(unit displays "No Card" for unavailable options).

2. Record option configurations for ANL 1 and

ANL 2 in the spaces provided (left). This
information is necessary when wiring analog
outputs.

3.6 Analog Output Connections

0 to 20/4 to 20 mA isolated or non-isolated
outputs as well as 0 to 5/0 to 10 VDC isolated or
non-isolated outputs are available (sec. 5.5).

RLY3

RLY4

C NO Tx GND Rx

1 2 3 4 5 6 7 8 9 10 11 12 13 14

+

R+ R-

-

-

+

15 16 17 18 19 20 21 22 23 24 25 26 27 28

SERIALANL2

S2 T2

CH2

CH1

S1 T1 SG CNO

14

L

1

AC IN

N

+ GND

NO C NC

RLY1DC IN

NO C NC

RLY2

R+ R-

ANL1

Special Considerations:

The maximum loop impedance for the 4 to 20 mA/0 to 20
mA output is 425 Ω. The minimum load impedance for the
0 to 5/0 to 10 V output is 1 kΩ (1000 Ω). To reduce the
possibility of noise interference, separate output lines from AC
power/relay lines.

W

4.1 Introduction

All functions which can be modified are contained
in three menus:

The CAL menu contains those functions related to
the sensor input signal and how it is interpreted by
the instrument. The CAL menu also provides
access to the display contrast and security code
features.

The RELAY menu contains those functions
necessary to control any installed output relays.

The Output menu contains those functions which
define and control all installed analog output
cards.

CAL Menu Functions

• Channel 1 cell selection

• Channel 1 scale selection

• Channel 1 decimal selection

• Channel 1 parts per million factor
(only shown with ppm scale selected)

• Channel 1 temp. coefficient (%/°C)

• Channel 1 wet cal. (see note below)

• Channel 2 on/off

(channel 2 off)

• Display contrast

• Security code

(channel 2 on)

• Channel 2 cell selection

• Channel 2 scale selection

• Channel 2 decimal selection

• Channel 2 parts per million factor
(only shown with ppm scale selected)

• Channel 2 temp. coefficient (%/°C)

• Channel 2 wet cal. (see note below)

Chapter 4

System
Configuration

et Calibration, when selected

• Insert sensor in conductivity solution (buffer)

• Accept or modify displayed buffer temp.

• Accept or modify displayed conductivity/resistivity

(continued)

15

OUTPUT Menu Functions

• Analog output 1 control selection

• Analog output 1 minimum setpoint

• Analog output 1 maximum setpoint

• Analog output 1 minimum adjust

• Analog output 1 maximum adjust

• Analog output 2 control selection

• Analog output 2 minimum setpoint

• Analog output 2 maximum setpoint

• Analog output 2 miminum adjust

• Analog output 2 maximum adjust

RELAY Menu Functions

• Relay/channel control selection

• Relay mode: HI/LO, OR Pulse

(HI/LO Modes)

• Relay setpoint

• Relay hysteresis

Channel 1 sensor cell
constant selection:

0.01, 0.1, 1.0, 10.0, 20.0

Channel 1 scale selection:

µ

S, mS, PPM, Kohm, or

Mohm

Channel 1 decimal:

199.99 to 19999

(Pulse Mode)

• Relay setpoint

• Relay endpoint

• Relay max. pulses

4.2 CAL Menu Functions

1. Channel 1 Cell Selection: Allows user to select

the channel 1 sensor cell constant.

2. Channel 1 Scale Selection: Allows user to

select the channel 1 conductivity scale. Five
scales are offered. The selected scale for this
channel will display in the RELAY setup and
OUTPUT setup menu.

3. Channel 1 Decimal: Allows the user to select

the decimal position for the selected CH1 scale.
Decimal selection will display in relay setup and
output setup menus.

Channel 1 parts per million
factor: selectable from 1.00
to 3.00

16

4. Channel 1 Parts Per Million Factor: Allows the

user to adjust the relationship between solution
conductivity (µS) and the total dissolved solid (TDS)
in parts per million units (PPM). The common value
for most natural occurring salts is 2.00 (factory
default). This function is not shown in the CAL
menu unless a ppm scale is selected (step 2). The
ppm relationship varies between chemicals
(sec. 5.7).

5. Channel 1 Temperature Compensation: The
temperature compensation value keeps the process
solution conductivity reading constant during
temperature changes. All conductivity readings
are based on 25 °C. A 2% conductivity change
for each °C is common for many chemicals
(factory default). However, many chemicals react
differently to temperature change (sec. 5.8).

6. Channel 1 Wet Calibration: Wet calibration
is a procedure that calibrates your system for
maximum accuracy. Wet calibration should be
performed during "first-time" system start-up and at
regular intervals. A solution of known conductivity
or resistivity (e.g. buffer) and an accurate
thermometer are required for calibration.
Calibration steps include:

• Unit display "CH1 INSERT". Place CH1 sensor
in known solution or buffer.

• Unit displays solution temperature. After
allowing for stabilization, the operator can
accept or modify the displayed solution
temperature.

• Unit displays solution value. Operator can
either accept or modify displayed value.

• Steps repeat for channel 2 (when enabled)

Channel 1 temperature
compensation percentage:
selectable from 0.00 to

9.99%/°C

Note:

Enter actual solution
temperature and value for
maximum system accuracy

7. Channel 2 On/Off: When "on", CAL menu
steps 1-6 repeat for channel 2 setup. When off,
channel 2 functions are not shown in the CAL
menu. When "off", all analog output signals
assigned to channel 2 are forced low, and relays
assigned to channel 2 are de-energized.

8. Display Contrast: Changes the LCD display
contrast for best visibility.

(continued)

Note: Turn channel 2 OFF to
simplify single channel system
setup.

17

Security code selection:
0000 to 9999

9. Security Code Selection: Changes the 4-digit
security code. When enabled, the security code
prevents unauthorized menu changes. The security
function can be disabled by changing an internal
dip switch setting (sec. 5.3).

4.3 RELAY Menu Functions

Relay 1 control selections:
CH1 or CH2,
Kohm, or Mohm
CH1 or CH2, temperature,
% rejection

% Rejection formula:
% rejection =

100% (1 - CH2/CH1)

µ

S, mS, PPM,

1. Relay 1 Control Selection: Relay 1 is
controlled by either conductivity, resistivity,
temperature, or % rejection.

• Conductivity/resistivity control: Relays assigned
for conductivity or resistivity control are energized
at specific levels programmed by the operator.

• Temperature control: Relays assigned for
temperature control are energized at specific
temperature levels programmed by the operator.

• % Rejection: Relays assigned for % rejection
control are energized when a user programmed
conductivity change (percentage) is measured
between CH1 and CH2. CH1 = high conductiv-

ity (feed), and CH2 = low conductivity (product).

This function is disabled when channel 2 is off.

2. Relay 1 Mode: Relay 1 can be configured for
either LO, HI, or proportional "Pulse" operation
(sec. 4.8).

Relay 1 setpoint: unlimited
within selected range

18

3. Relay 1 Setpoint: Changes the value at which
relay 1 is energized.

4. Relay 1 Hysteresis: Changes the relay 1
hysteresis value. Hysteresis values directly effect
the LO and HI relay modes. Hysteresis is used to
prevent relay "chatter", caused by the control value
(e.g. conductivity) hovering around the relay's
setpoint (sec. 4.8).

Relay 1 hysteresis: unlimited
within selected range

5. Relay 1 Endpoint: Changes the control value
for relay 1's maximum pulse rate.

6. Relay 1 Pulse Rate: Changes the pulse rate
for relay 1 (sec. 4.8).

Functions 1-6 above repeat for relays 2-4, when
installed.

4.4 OUTPUT Menu Functions

1. Analog Output 1 Control Selection: Analog

output control selections are identical to relay
control selections (sec. 4.3).

2. Analog Output 1 Minimum Setpoint: Allows
the operator to enter the conductivity, resistivity,
temperature, or % rejection value that corresponds
to the minimum analog output level (e.g. 4 mA).

3. Analog Output 1 Maximum Setpoint: Allows
the operator to enter the conductivity, resistivity,
temperature, or % rejection value that corresponds
to the maximum analog output level (e.g. 20 mA).

Relay 1 endpoint: unlimited
within selected range

Relay 1 pulse rate: 0 to 120
pulses per minute maximum.

Analog output control

µ

selections: CH1 or CH2,
mS, PPM, Kohm, Mohm
CH1 or CH2, temperature or
% rejection.

Analog output 1 minimum
setpoint: Selectable for any
value within selected range.

Analog output 1 maximum
setpoint: Selectable for any
value within selected range.

S,

4. Analog Output 1 Minimum Output Adjust:

Allows the operator to adjust the minimum analog
output level from the front keypad. An accurate
digital voltage meter (DVM) is required for calibra­tion.

(continued)

Analog output 1 minimum
adjust: Adjustable for
maximum accuracy.

19

% REJ

Analog output 1 maximum
adjust: Adjustable for
maximum accuracy.

5. Analog Output 1 Maximum Output Adjust:

Allows the operator to adjust the maximum analog
output level from the front keypad. An accurate
digital voltage meter (DVM) is required for
calibration.

Functions 1-5 above repeat for analog output 2,
when installed.

4.5 Quick-Reference Keypad Sequence

The following sequence is used to view, modify,
and exit all setup menu functions. Familiarize
yourself with this procedure before attempting CAL,
RELAY, and OUTPUT menu setup (sec. 4.6, 4.9,
and 4.10).

MOD

1. Press:

to enable calibration sequence.

The security function can be
disabled via. internal dip
switch (sec. 5.2).

Accessing any setup menu
(step 3), forces all analog
output signals low and
temporarily de-energizes all
available relays.

20

2. Enter security code (when active) using:

% REJ

TEMP

COND
RES

; press:

ENTER

to confirm.

(the security code is factory preset to 0000)

3. Select menu:

RELAY

CAL

or

OUTPUT

; press menu

key repeatedly to scroll through displayed menu.

MOD

4. Press:

to select displayed menu function

for modification.

TEMP

5. Modify item using:

MOD

to recall previous value OR

COND
RES

ENTER

; press:

to save.

6. Press:

CAL

or

OUTPUT

to view next item.

RELAY

7. Repeat steps 4-6 of this procedure to modify
each menu item.

Exit menu by pressing:

COND
RES

To exit or advance menu you must first press:

ENTER

to save changes OR press:

restore previous value, followed by:

MOD

to

COND
RES

to exit

menu and return to operation mode.

Cannot exit menu
while editing?

21

The security function is not
displayed when disabled
(sec. 5.3).

4.6 CAL Menu

No

Yes

Security

MOD

Code?

Enter security
code using:

CALENTER

Displays shown are for
example only, actual
displays may vary.

Menu access forces all
analog output signals
low and temporarily
de-energizes available
output relays.

PPM scale

NOT selected

step 2

1

Next menu item

CAL

2

Next menu item

CAL

3

Next menu item

CAL

PPM scale SELECTED step 2

4

Next menu item

CAL

Modify?

No

Modify?

No

Modify?

No

Modify?

No

Yes

Exit menu

Yes

Exit menu

Yes

Exit menu

Yes

Exit menu

Press to select

MOD

sensor cell constant

Recall previous value

COND
RES

Press to select

MOD

conductivity scale

Recall previous value

COND
RES

Press to select

MOD

display decimal
position

Recall previous value

COND
RES

Press to enter

MOD

ppm factor, see
section 5.7

Recall previous value

COND
RES

ENTER

MOD

ENTER

MOD

ENTER

MOD

ENTER

MOD

An internal pure water
curve is used for the 10 M
to 18 MΩ (0.055 µS to

0.1 µS) range. The factory
default setting of 2.00%/°C
should be used for this
range.

22

Yes

Ω

5

Next menu item

CAL

Modify?

No

Exit menu

Press to enter

MOD

temperature comp.
%, see section 5.8

Recall previous value

COND
RES

ENTER

MOD

Continued on next page

Continued from previous page

Yes

No

Exit menu

MOD

COND
RES

6

Next menu item

CAL

Modify?

See section

4.7 procedure

Section 4.7

complete

A known solution (sec. 5.6)
is required for the "WET
CAL" procedure (sec. 4.7).

Yes

Modify?

7

No

Next menu item

CAL

Exit menu

Yes

8

Next menu item

CAL

9

Repeat menu

CAL

Modify?

No

Exit menu

Modify?

No

Exit menu

Yes

Press to turn

MOD

channel 2 on or
off

Recall previous value

COND
RES

Press to select

MOD

best display
contrast

Recall previous value

COND
RES

Press to enter

MOD

security code

Recall previous value

COND
RES

MOD

MOD

MOD

ENTER

With CH2 ON, menu steps
1-6 repeat for CH2 setup.
Step 7 is not shown after
CH2 setup.

ENTER

ENTER

23

Exit Wet Cal?

COND

Press
during steps 1-4 to exit wet

cal procedure.

RES

at any time

Default
display for
CH1

4.7 Wet Calibration Procedure

Wet calibration is necessary for maximum system
accuracy. This procedure is recommended for
"first-time" system start-up and for periodic sensor
verification. A solution of known value (e.g.
buffer), a clean container, and an accurate °C
thermometer are required for calibration.

1. Access and scroll through the CAL Menu until
the display shows "WET CAL" (sec. 4.6).

MOD

• Press

2. Place channel 1's sensor and °C thermometer
into the known solution. Lightly tap the sensor
electrode body against the side of the container to
remove trapped air bubbles. Allow for
temperature stabilization.

display shows "INSERT".

24

Temperature
display
example

Example
enabled
for change

Example
changed as
measured

Conductivity
display
example

3. Solution temperature is now displayed. Accept
or modify displayed value as follows:

Press
Press

ENTER

to accept displayed temperature, OR

MOD

to enter actual solution temperature as

follows:
A) Press

% REJ

TEMP

COND

to enter measured

RES

temperature (°C).

B) Press
C) Press

MOD

then

ENTER

to save entry and advance to

ENTER

to cancel entry, OR

step 4.

4. Solution value is now displayed. Accept or
modify displayed value as follows:

Press
Press

A) Press

ENTER

to accept displayed value, OR

MOD

to enter known value as follows:

% REJ TEMP

COND

to change displayed

RES

value.

B) Press
C) Press

MOD

then

ENTER

to save entry, "WET CAL" is now

ENTER

to cancel entry, OR

displayed. Three options are offered at this
time:

MOD

• Press

to repeat the WET CAL

procedure, OR

Example
enabled
for change

Example
changed to
buffer value

Reset channel: enter zero to
reset factory defaults, if
desired.

Error message: "Out of
Range" (sec. 5.9)

• Press

CAL

to advance to the next menu

item, OR

• Press

COND

to exit the CAL Menu and return

RES

to operation mode.

4.8 Relay Operation

Up to four optional relays can be installed for
external device control (sec. 3.4). Each relay can
be assigned to either channel 1 or 2.

Relays are controlled by either conductivity,
resistivity, temperature, or % rejection between
channels, see section 4.3. Each relay can be
selected for LO, HI or proportional "pulse"
operation as follows:

25

LO Relay

Operation

Control

value

= LO setpoint
= Hysteresis

= Relay
energized

= Relay
de-energized

HI Relay

Operation

LO/HI operation: When a relay is selected for
LO or HI operation, an individual setpoint and
hysteresis value is entered for that relay.

• Relay Setpoint: Setpoints represent the control
value at which the relay is energized. Setpoint
units are displayed as µS, mS, ppm, kΩ, MΩ, °C,
or % depending on the relay's assigned channel,
range, and control selection (sec. 4.3).

• Relay Hysteresis: Hysteresis values directly
effect the LO and HI relay modes. Hysteresis is
used to prevent relay "chatter", caused by the
control value (e.g. temperature) hovering around
the relay's setpoint. If the measured control value
is fluctuating, increase the hysteresis value to
prevent relay chatter. If the measured control
values is stable, decrease the hysteresis value to
maximize relay sensitivity.

• LO Relay Operation: In LO operation, the relay
is energized when the control value drops below
the relay setpoint, and is de-energized when the
control value rises above the setpoint plus
hysteresis, see LO relay operation diagram (left).

26

Control

value

= HI setpoint
= Hysteresis

= Relay
energized

= Relay
de-energized

• HI Relay Operation: In HI operation, the relay
is energized when the control value rises above
the relay setpoint, and is de-energized when the
control value falls below the relay setpoint plus
hysteresis, see HI relay operation diagram (left).

Proportional "Pulse" Relay Operation: The
proportional pulse relay configuration is primarily
designed for controlling metering pumps.
Setpoints, endpoints, and maximum pulse rates are
selected via the relay menu.

• Setpoint: Control value at which relay pulsing
just begins.

Control value

A

120 max.

Setpoint Endpoint

120 max.

B

Control value

SetpointEndpoint

• Endpoint: Control value at which the relay
pulse rate reaches the user set maximum value.

• Pulse Rate: User set from 0 to 120 pulses per
minute maximum. Setting to 0 provides a quick
way to disable an assigned relay.

4.9 RELAY Menu

No

Yes

Security

MOD

Code?

1

Next menu item

RELAY

2

Next menu item

RELAY

Enter security
code using:

Modify?

No

Exit menu

Modify?

No

Exit menu

Yes

Yes

Press to choose

MOD

relay control
selection

Recall previous value

COND
RES

MOD

Recall previous value

COND
RES

ENTER

Press to select
relay mode

MOD

MOD

The security function is not
displayed when disabled

RELAY

(sec. 5.3).
Displays shown are for

example only, actual

ENTER

displays may vary.

Menu access temporarily
de-energizes available
output relays and forces
all analog outputs low.

ENTER

Continued on next page

27

Continued from previous page

Pulse mode

selected

step 2

Menu repeats for each
installed relay.

MOD

Press to
enter relay setpoint
value

ENTER

MOD

Yes

3

Modify?

No

Recall previous value

Next menu item

RELAY

Exit menu

COND
RES

HI or LO mode selected step 2

Yes

4

Repeat Menu?

RELAY

Modify?

No

Exit menu

Yes

5

Next menu item

RELAY

Modify?

No

Exit menu

Yes

6

Repeat Menu?

RELAY

Modify?

No

Exit menu

Press to enter

MOD

relay hysteresis
value

Recall previous value

COND
RES

Press to enter

MOD

relay endpoint
value

Recall previous value

COND
RES

Press to enter

MOD

relay maximum
pulse rate

Recall previous value

COND
RES

ENTER

MOD

ENTER

MOD

ENTER

MOD

28

4.10 OUTPUT Menu

15 16 17 18 19 20 21 22 23 24 25 26 27 28

L

1

N

AC IN

+ GND

NO C NC

RLY1DC IN

NO C NC

RLY2

R+ R-

ANL1

1 2 3 4 5 6 7 8 9 10 11 12 13 14

C NO Tx GND Rx

CH2

S2 T2

S1 T1 SG CNO

R+ R-

RLY3

RLY4

SERIALANL2

CH1

R+
R-

R+

R-

AMMETER

Security

MOD

Code?

1

Next menu item

OUTPUT

2

Next menu item

OUTPUT

3

Next menu item

OUTPUT

4

Ammeter required,
see Figure 1

Next menu item

OUTPUT

No

Yes

Enter security
code using:

Modify?

No

Yes

Press to choose

MOD

output control
selection

Recall previous value

ENTER

MOD

The security function is not
displayed when disabled

OUTPUT

(sec. 5.2).

4 to 20/0 to 20 mA

ENTER

isolated/non-isolated
options illustrated for
example only, actual
displays may vary.

Exit menu

Modify?

No

Exit menu

Modify?

No

Exit menu

Yes

Yes

COND
RES

Press to enter

MOD

value at minimum
current output

Recall previous value

COND
RES

Press to enter

MOD

value at maximum
current output

Recall previous value

COND
RES

MOD

MOD

Menu access forces all

ENTER

analog outputs low and
temporarily de-energizes
available output relays.

ENTER

Figure 1

Modify?

No

Exit menu

Yes

Press to fine

MOD

tune 4 mA output
signal, see note*

Recall previous value

COND
RES

MOD

*The min. and max. current

ENTER

adjustment steps require an
external ammeter for
monitoring the current
levels.

5

Ammeter required,
see Figure 1

OUTPUT

Repeat Menu?

Modify?

No

Exit menu

Yes

MOD

Recall previous value

COND
RES

Press to fine
tune 20 mA output
signal, see note*

ENTER

MOD

29

4.11 View Only Menus

OUTPUT

Three "view-only" menus are available any time
during operation. Menu access does not affect
the measurement in any way.

Access the "view-only" menu of choice by pressing:

RELAY

CAL

Each menu item is displayed in the following order
by successively pressing the corresponding menu
key:

CAL View-Only Menu

or

Displays shown are for
example only, actual displays
may vary.

Display steps 2 are shown
only when channel 2 is on.

Displays shown are for
example only, actual displays
may vary.

Function 4 only displays when
HI or LO mode selections are
made.

Function 5 only displays when
the proportional "pulse" relay
mode is selected.

1. Channel 1 cell constant
selection:

2. Channel 2 cell constant
selection:

RELAY View-Only Menu

1. Relay 1 control selection:

2. Relay 1 mode selection:

3. Relay 1 setpoint selection:

4. Relay 1 hysteresis selection:

5. Relay 1 endpoint selection:

30

4. Relay 1 maximum pulse rate
selection:

Functions 1-6 repeat for all installed relays.

OUTPUT View-Only Menu

Function 6 only displays when
the proportional "pulse" relay
mode is selected.

1. Analog output 1 control value
selection:

2. Analog output 1 minimum current
output level selection:

3. Analog output 1 maximum current
output level selection:

4 to 20 mA output option
illustrated for example only,
actual displays may vary.

31

Chapter 5

Technical

5.1 Accessing Internal Options

1. Remove bezel (1) by placing a coin in the
notch (2), twist coin to remove the bezel from the
instrument casing, see Figure 2.

Support

Figure 2

1

2

Figure 3

3

RLY 1
RLY 2
RLY 3
RLY 4

Front
Panel

Side View

4

2. Loosen the four front bracket screws (3), then
loosen the center "jackscrew" (4), see Figure 3.

3. Slide the electronics assembly (5) from the
instrument casing, see Figure 4.

4. Lift upper retainer with adhesive gasket to
install/remove plug-in cards. Be sure plug-in cards
are properly seated in slots before reassembling

instrument, see Figure 4.

Figure 4

Input/
output
cards

card retainer

5

Push down on card retainer
to slide the chassis back
into the case.

Input/
output
cards

32

5.2 AC Power Configurations

Two AC power options are possible; 90 to 132
VAC, or 180 to 264 VAC. Each power option is
selectable via internal jumpers on the main pc
board (fig. 5).

Option Sockets

Security Feature

123

Enable the security

feature by setting
position #1 "closed"

123

Disable the security

feature by setting
position #1 "open"

OPEN

OPEN

4

4

1
2

OPEN

3
4

INPUT CARD

Figure 5

Main pc board
(top view)

OUTPUT CARD #1

OUTPUT CARD #2

Blue
Jumpers

OUTPUT CARD #3

180 to 264 VAC

operation

90 to 132 VAC

operation

OR

5.3 Security Code Function

The security function prompts the operator for a
4-digit code during setup menu access, when
enabled. This function prohibits unauthorized entry
and/or alterations to system parameters. The
security code is factory preset to 0000. The code
is programmable from 0000 to 9999 (sec. 4.6).

The security function can be completely disabled
by changing an internal dip switch setting (fig. 5).
When disabled, the security function is no longer
prompted during setup menu access.

Fuse, 1/4 A @
250 VAC (fast blow)

Example shows the factory
preset security code setting of

0000.

33

5.4 Installing Input/Output Options

Input/output option cards are "keyed" for proper
insertion into four sockets. These sockets are
clearly marked on the unit's main pc board. See
Figure 5 (pg 33) and table below:

Socket Labeled Compatible Options

Input Card Dedicated for input option cards

Output Card #1 Accepts all analog option cards, except the Dual

Proportional Relay Card.

Output Card #2 Accepts all analog option cards and Dual

Proportional Relay Card

Output Card #3 Dedicated for the 2-Relay Option Card

5.5 Output Card Configurations

Each 4 to 20/0 to 20 mA (iso or non-iso) output
card contains jumper selections for the desired
operation range:

34

• Place the blue jumper in position "A" for
4 to 20 mA operation.

• Place the blue jumper in position "B" for
0 to 20 mA operation.

Non-isolated

version

A B

Blue
Jumper

Isolated version

B

Blue

Jumper

A

5.6 Options and Accessories

Part Number Output Cards

PHOR-90-MA-N (Requires 4 to 20/0 to 20 mA (non-isolated)
configuration, sec. 5.5)

PHOR-90-5V-N 0 to 5 VDC (non-isolated)

PHOR-90-10V-N 0 to 10 VDC (non-isolated)

PHOR-90-MA­configuration, sec. 5.5)

PHOR-90-5V-I 0 to 5 VDC (isolated)

PHOR-90-10V-I 0 to 10 VDC (isolated)

PHOR-90-R2 2-Relay Card

PHOR-90-PC Proportional Relay Card

Part Number Optional Accessories

PHOR-9AP Panel mounting adapter plate (5.5 in. to DIN cutout

PHCN-90-BRACKET Surface mount bracket

PHOR-9RC NEMA 4X/IP65 back cover kit (conduit connectors

3-9000.392 Conduit connector kit for NEMA 4X/IP65 cover

Part Number Spare Parts

3-9000.525-1 Front Bezel

I (Requires 4 to 20/0 to 20 mA (isolated)

size)

ordered below)

(3 pcs. included)

3-9000.575 Panel mounting gasket
3-9000.560 Mounting Clamp

35

Part Number Spare Parts

2400-0404 Front cover screws (4 each)

3-9000.570 Front cover gasket

5.7 Parts Per Million Conversion Factor

The CDCN-90A is capable of displaying total
dissolved solids (TDS) in parts per million (PPM)
units. This is done by dividing the actual solution
conductivity in µS by the programmed parts per
million factor (PPMF).

TDS (PPM)= Solution conductivity (µS)

PPMF

36

The factory default parts per million factor (PPMF)
is 2.00 for example:

• PPMF = 2.00 (factory default)

• Solution conductivity is 400 µS

• TDS (PPM) = 400 = 200 on the display

2.00

This PPM factor is adjustable from 1.00 to 3.00.
This allows you to change the displayed PPM
value based on your application. For example:

• PPMF = 1.25 (user programmed)

• Solution conductivity is 400 µS

• TDS (PPM) = 400 = 320 on the display

1.25

5.8 Temperature Coefficient

Conductivity measurement is highly dependent on
temperature. Temperature dependence is usually
expressed as the relative change per °C,
commonly known as percent/°C change from
25 °C, or slope of the solution.

Slopes can vary significantly depending on
process solution type. The factory default
temperature compensation factor is 2%/°C. This
setting satisfies many general applications. Your
process solution may require adjustment for
maximum accuracy. The following procedure can
be used to determine the optimum temperature
compensation factor for your process. This
procedure is handy when published reference
handbooks are not available or your system
consists of many chemical types.

Equipment Required

• CDCN-90A controller with OMEGA
Engineering Conductivity Sensor

• Process solution samples (2)

Important:

Do not use this procedure

for solutions from 0.055

0.1 µS (10 MΩ to 18 MΩ).
An internal pure water curve is
used for these ranges. The
factory default setting of

2.00%/°C should be used.

µ

S to

Procedure

1. Disable the temperature compensation factor by

entering 0.00 (sec. 4.6).

2. Heat the sample solution close to the maximum

process temperature. Place sensor in the sample
solution (allow several minutes for stabilization).
Record the displayed temperature and conductivity
values in the spaces provided (left).

• Press:

• Press:

TEMP

to display temperature.

COND

to display conductivity.

RES

(continued)

Sample Solution (Step 2)

Displayed temperature:
T1= __________________°C

Displayed conductivity:
C1= ____________________

37

Sample Solution (Step 3)

Displayed temperature:
T2 = _________________°C

Displayed conductivity:

3. Cool the sample solution close to the minimum
process temperature. Place sensor in the sample
solution (allow several minutes for stabilization).
Record displayed temperature and conductivity
values in the spaces provided (right).

C2 = ___________________

A 10% change in conductivity between steps
2 and 3 is required for optimum performance. If
necessary, increase maximum (step 2) and reduce
minimum (step 3) sample temperature. This will
result in a larger change in conductivity between
steps.

4. Substitute recorded readings (step 2 and 3)
into the following formula:

TC Slope = 100 x (C1 - C2)

(C2 x (T1 - 25)) - (C1 x (T2 - 25))

A sample solution has a conductivity of 205 µS @
48 °C. After cooling the solution, the conductivity
was measured at 150 µS @ 23 °C. Therefore:
C1 = 205, T1 = 48, C2 = 150, T2 = 23.

The TC is calculated as follows:
TC Slope = 100 x (205 - 150)

(150 x (48 - 25)) - (205 x (23 - 25))

38

5500 = 1.42%/°C

=
3860

5.9 Troubleshooting

CAL/RELAY/OUTPUT Menu Messages

Displayed Message Cause Solution

1. "...PPM FACTOR MUST Number entered Enter number between 1.00 and
BE BETWEEN 1 outside range 3.00, factory default 2.00 (sec. 4.6)
AND 3..."

2. "...MAX PULSE RATE Entered number Enter number between 1 and 120,
MUST BE 120 OR too large factory default 120 (sec. 4.9)
LESS..."

3. "_ _ _ _" Relay or analog A) Reenter new setpoint within

output setpoint displayed range (sec. 4.9, 4.10).
(message shows in too large for display Note: pressing MOD" when
RELAY, OUTPUT, and decimal setting "_ _ _ _" is displayed resets setpoint
VIEWMODE menus) (display overrange) to 19999

B) Reset CAL menu display decimal,
move to right for greater range
(sec. 4.6).

4. "...SCALE OR DECIMAL Changed previously A) Press "LEFT "arrow key to cancel
CHANGED - CHECK selected scale or B) Change relay and output settings
RELAY AND OUTPUT decimal setting to reflect new scale selection,
SETTINGS..." (sec. 4.9 - 4.10)

5. "CAL RESET" Zero entered for Note: unit resets to factory default

conductivity value values shown in sec. 4.6, 4.9, 4.10
(Wet Cal procedure during "Wet Cal"
only, sec. 4.7) procedure

6. "WAIT" Minimum and/or Not Applicable
maximum current
output adjustment
changed

7. "CODE ERROR" Wrong security code Enter correct security code or disable

entered feature (sec. 5.3)

8. "...Must be Less Than Wet Cal value out Input value less than 18.1 Mohms

18.1 Mohms..." or range for Wet Cal. (sec. 4.7)

9. "...Must be Greater than Wet Cal value out Input value greater than 0.049 µS

0.549 uS..." of range for Wet Cal. (sec. 4.7)

39

Operational Messages

Displayed Message Cause Solution

1. "_ _ _ _" A) Displayed A) Change to larger scale or shift
reading too large display decimal to the right (sec. 4.6)

(4-dashes) B) Temp. comp. % B) Verify temperature compensation

selection too large. % setting for your process (sec. 5.8)
C) Temp. input too C) Verify sensor wiring or replace
high. sensor (sec. 3.3).
D) Shorted or open D) Verify sensor wiring (sec. 3.3).
sensor wiring

2. "_ _ _ _ _" Open or missing Verify sensor wiring or replace sensor
temperature signal (sec. 3.3)

(5-dashes) from sensor

3. "0.00", "0.0", OR A) Improperly wired A) Verify sensor connection

"0" or missing sensor (sec. 3.3)
shown at all times B) Scale selection set B) Set scale to lower value (e.g. ms
(will not change) too high to µS, sec. 4.6)

C) Insufficient C) Display decimal resolution too
decimal l resolution low, move decimal to left (sec. 4.6)
selected D) Verify temp. comp. % setting for
D) Temp. comp. % your solution (sec. 5.8)
set too high with very E) Check sensor installation (sec. 2.2)
low solution temp. F) Verify sensor range (sec. 2.1)
E) Sensor cell not G) Verify sensor wiring (sec. 3.3)
in solution
F) Solution
conductance too high
or resistance too low
for sensor used
G) Shorted or open
sensor wiring

4. "...CHECK INPUT Wrong, missing, or A) Verify input card type (sec. 5.6)

CARD..." damaged input card B) Install input card (sec. 5.4)

C) Replace input card (sec. 5.1)

5. "...NO CARD..." Missing or damaged A) Install card (sec. 5.4)

card B) Replace card (sec. 5.1)

(continued)

40

Operational Messages Continued

Displayed Message Cause Solution

6. "...OUT OF RANGE" A) Temp. improperly A) Check solution temp. and sensor
entered or bad wiring (sec. 3.3)

(Wet Cal Only, sensor B) Verify cell range (sec. 2.1), check
sec. 4.7) B) Wrong sensor buffer value, verify scale selection

cell or wrong buffer (sec. 4.6)
for selected scale

7. "ERR CH2 OFF" "% REJ" key pressed Turn CH2 on, if desired (sec. 4.6)

when CH2 is off

8. "VIEWMODE" "ENTER" or "MOD" Press "LEFT" arrow key to return to

key pressed while in operation mode, then press "MOD"
the "VIEW ONLY" key followed by the "CAL", "RELAY, or
menu "OUTPUT" key for setup access

41

Specifications

General Data

Conductivity range: 0.055 µS to 400,000 µS

(2.5Ω to 18 MΩ

Resistivity/conductivity measurements from
10 MΩ to 18 MΩ (0.055 µS to 0.1 µS) must
be performed in solution temperatures from
20 °C to 100 °C.

Temperature range: 0 to 100 °C
Isolation: 500 VDC to earth ground
Sensor compatibility: OMEGA CECE-90 Series

Conductivity/Resistivity
Sensors

Liquid crystal display: 4.5-digit 0.5 inch high

(upper), 8-digit 0.3 inch
high (lower), 4 relay status

annunciators
Display accuracy: ±2% of reading
Display repeatability: ±0.5% of reading
Output accuracy: ±0.5% of full scale
Memory backup: Long life NovRam
Temp. compensation: PT1000 compatible only

)

(continued)
42

Enclosure

Material: ABS plastic
Rating: NEMA 4X/IP65 front

NEMA 4X/IP65 rear

cover kit (optional)

Electrical Data

Power requirements: 17 to 30 VDC @

0.5 A max. and/or

90 to 132 VAC @

50 to 60 Hz, or

180 to 264 VAC @

50 to 60 Hz (jumper

selectable)
Noise immunity: Meets IEC 801-2 level 4,

IEC 801-3, level 1

Ambient Conditions

Operating temp.: 32 to 130 °F/0 to 55 °C
Relative humidity: 95% maximum,

non-condensing

Optional Cards (Section 5.6)

2-Relay Card
Contacts: 2 SPDT outputs
Rating: 5 A @ 250 VAC or 30 VDC

maximum

Dual Proportional Relay Card
Contacts: 2 SPST outputs
Rating: 5 A @ 250 VAC or 30 VDC

maximum

4 to 20/0 to 20 mA Output Card
Response time: 2.5s max. for 100%change
Loop resistance: 425 Ω maximum
Isolation: 500 VDC to earth ground

0 to 5/0 to 10 VDC Output Card
Response time: 2.5s max. for 100% change
Load resistance: 1 kΩ minimum
Isolation: 500 VDC to earth ground

43

NOTES:

44