Omega Products CDTX-90 Installation Manual

Conductivity/Resistivity

ISO 9002

CERTIFIED

CORPORATE QUALITY

MANCHESTER, UK

User’s Guide

62.50 uS/cm

25.0° C

ENTER

Shop online at

www.omega.com

e-mail: [e-mail]

ISO 9001

CERTIFIED

CORPORATE QUALITY

STAMFORD, CT

CDTX-90 Series

Conductivity/Resistivity Transmitters

omega.com

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TM

®

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WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

Omega CDTX-90 Series Conductivity/Resistivity Transmitter

Conductivity/Resistivity

62.50 uS/cm

25.0° C

ENTER

CAUTION!

• Remove power to unit before wiring
input and output connections.

• Follow instructions carefully to avoid
personal injury.

Contents

1. Installation

2. Specifi cations

3. Electrical Connections

4. Menu Functions

1. Installation

CDTX-90 Series transmitters are available in two styles: panel mount and fi eld mount. The panel mount is supplied with the
necessary hardware to install the transmitter. This manual includes complete panel mounting instructions.
Field mounting requires a separate mounting kit. The FP90UM Universal kit enables the transmitter to be installed virtually
anywhere. Detailed instructions for fi eld installation options are included with the FP90UM Universal kit.

1.1 Panel Installation

1. The panel mount transmitter is designed for installation using a 1/4 DIN Punch. For manual panel cutout, an adhesive
template is provided as an installation guide. Recommended clearance on all sides between instruments is 1 inch.

2. Place gasket on instrument, and install in panel.

3. Slide mounting bracket over back of instrument until quick-clips snap into latches on side of instrument.

4. To remove, secure instrument temporarily with tape from front or grip from rear of instrument. DO NOT RELEASE.

Press quick-clips outward and remove.

Optional
Rear
Cover

56 mm

41 mm

(2.2 in.)

(1.6 in.

)

97 mm
(3.8 in.)

Panel Mount with

NEMA 4X rear cover

92 mm
(3.6 in.)

96 mm

(3.8 in.)

FRONT VIEW

Field &

Panel Mount

96 mm
(3.8 in.)

106 mm
(4.18 in.)

SIDE VIEW

Field Mount with

Universal kit

82 mm
(3.23 in.)

42 mm
(1.7 in.)

107 mm (4.2 in.)

SIDE VIEW

Field Mount with

Integral kit

65 mm
(2.5 in.)

96 mm

(3.8 in.)

2. Specifi cations

General

Compatible electrodes: Omega CDCE-90 Series Standard and

Accuracy: ±2% of reading
Enclosure:

• Rating: NEMA 4X/IP65 front

• Case: PBT

• Panel case gasket: Neoprene

• Window: Polyurethane coated polycarbonate

• Keypad: Sealed 4-key silicone rubber

• Weight: Approx. 325g (12 oz.)
Display:

• Alphanumeric 2 x 16 LCD

• Contrast: User selected, 5 levels

• Update rate: 1.8 seconds

Electrical

• Power: 12 to 24 VDC ±10%, regulated, 80 mA max.

Sensor input range:

• Conductivity: 0.055 to 400,000 μS

• Resistivity: 10 KΩ to 18.2 MΩ
( 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. )

• TDS: 0.023 to 200,000 ppm

• Temperature: PT 1000, -25 to 120°C (-13 to 248°F)
Current output:

• 4 to 20 mA, isolated, fully adjustable and reversible

• Max loop impedance: 50 Ω max. @ 12 V
325 Ω max. @ 18 V
600 Ω max. @ 24 V

Certifi ed Series Conductivity/Resistivity Electrodes

• Update rate: 200 mS

• Accuracy: ±0.03 mA @ 25°C, 24 V
Relay outputs
(CDTX-90-2 includes 2 mechanical SPDT contacts):

• Maximum voltage rating:
5 A @ 30 VDC, or 5 A @ 250 VAC, resistive load

• Programmable for:

• High or Low setpoint with adjustable hysteresis

• Pulse operation (max. rate 400 pulses/min)

Open-collector output, optically isolated:

• 50 mA max. sink, 30 VDC maximum pull-up voltage.

• Programmable for:

• High or Low setpoint with adjustable hysteresis

• Pulse operation (max. rate 400 pulses/min)

Environmental

• Operating temperature: -10 to 70°C (14 to 158°F)

• Storage temperature: -15 to 80°C (5 to 176°F)

• Relative humidity: 0 to 95%, non-condensing

• Maximum altitude: 2000 m (6562 ft)

• Insulation category: II

• Pollution degree: 2

Standards and Approvals

• CE

• Immunity: EN50082-2

• Emissions: EN55011

• Safety: EN61010

• Manufactured under ISO 9001 and ISO 14001

• U.S.A. Patent # 5,708,363

page 1

(18 MΩ)

(10 kΩ)

CDCE-90-001

CDCE-90-20

Conductivity Range (µS)

CDCE-90 Series Sensor Ranges

Sensor Models

Ultra-

Pure

Rinse

Pure

CDCE-90-1

CDCE-90-10

CDCE-90-01

0.055 1 10 100 200 1,000 10,000 200,000 400,000

3. Electrical Connections

Sensor Selection

Select the sensor with a range closest to your process minimum and
maximum values.

• CDCE-90-001 (0.01 cell): 0.055 to 100 μS (10 kΩ to 18 MΩ)
Use the CDCE-90-001 for all resistivity requirements

• CDCE-90-01 (0.1 cell): 1 to 1000 μS

• CDCE-90-1 (1.0 cell): 10 to 10,000 μS

• CDCE-90-10 (10.0 cell): 100 to 200,000 μS

• CDCE-90-20 (20.0 cell): 200 to 400,000 μS

Wiring Tips:

• Do not route sensor cable in conduit containing AC power
wiring. Electrical noise may interfere with sensor signal.

• Routing sensor cable in grounded metal conduit will help
prevent electrical noise and mechanical damage.

• Seal cable entry points to prevent moisture damage.

• Only one wire should be inserted into a terminal. Splice
double wires outside the terminal.

• Sensor cable may not be extended over 100 ft.

Caution: Failure to fully open terminal jaws before removing wire may permanently damage instrument.

CDTX-90

Conductivity/Resistivity

62.50 uS/cm

25.0 °C

ENTER

≤ 100 ft. (30 m)

Wiring Procedure

1. Remove 0.5 - 0.625 in. (13-16 mm) of insulation from wire end.

2. Press the orange terminal lever downward with a small screwdriver to open terminal jaws.

3. Insert exposed (non-insulated) wire end in terminal hole until it bottoms out.

4. Release orange terminal lever to secure wire in place. Gently pull on each wire to ensure a good connection.

Wiring Removal Procedure

1. Press the orange terminal lever downward with a small screwdriver to open terminal jaws.

2. When fully open, remove wire from terminal.

3.1 Sensor Connections

CDTX-90-1 Terminals

Shield (Sensor Gnd)

10

Black (Iso Gnd)

9

White (Temp In)

8

Red (Signal In)

7

CDTX-90-2 Terminals

Shield (Sensor Gnd)

14

Black (Iso Gnd)

13

White (Temp In)

12

Red (Signal In)

11

CDCE-90 Series Standard and Certified Cells

2

1

CDTX-90-3 Terminals

page 2

Shield (Sensor Gnd)

14

Black (Iso Gnd)

13

White (Temp In)

12

Red (Signal In)

11

Stand-alone application, no current loop used

Transmitter

4
3
2
1

Sys. Pwr.
Loop -

Sys. Pwr.
Loop +

AUX
Power -

AUX
Power +

Power Supply
DC 12 - 24 V

Power
Supply

Power
Supply

Connection to a PLC with built-in power supply

PLC

Power Supply
Ground

Power
Supply

Loop Input
4-20 mA

Loop Input
4-20 mA

Internal PLC
Connection

Connection to a PLC/Recorder, separate supply

PLC or Recorder

Loop Input
4-20 mA in

Loop Input
4-20 mA in

DC 12 - 24 V

Power
Supply

Power
Supply

Example: Two transmitters connected to PLC/Recorder

with separate power supply

Transmitter 2

4
3
2
1

DC 12 - 24 V

Power
Supply

Power
Supply

Transmitter 1

4
3
2
1

Transmitter

4
3
2
1

Sys. Pwr.
Loop -

Sys. Pwr.
Loop +

AUX
Power -

AUX
Power +

Transmitter

4
3
2
1

Sys. Pwr.
Loop -

Sys. Pwr.
Loop +

AUX
Power -

AUX
Power +

Sys. Pwr.
Loop -

Sys. Pwr.
Loop +

AUX
Power -

AUX
Power +

Sys. Pwr.
Loop -

Sys. Pwr.
Loop +

AUX
Power -

AUX
Power +

PLC or Recorder

Channel 1
4-20 mA in

Channel 1
4-20 mA in

Channel 2
4-20 mA in

Channel 2
4-20 mA in

Terminals

Terminals

Terminals

Terminals

-

+

-

+

-

+

-

+

-

+

-

+

-

+

AUX power required for all CDTX-90 systems.

CDTX-90-1 Terminal connections

Output -

Output +

System Pwr
Loop -

System Pwr
Loop +

4

3

2

1

6

5

Sensr Gnd
(SHIELD)

Iso. Gnd
(BLACK)

Temp. IN
(WHITE)

Signal IN
(RED)

10

9

8

7

AUX
Power -

AUX
Power +

Internal open-collector

output circuit

Output --

Output +

Isolation

15W

S

D

Terminals 3 and 4: Loop Power

12-24 VDC ±10% system power
and current loop output.
Max. loop impedance:
50 Ω max. @ 12 V
325 Ω max. @ 18 V
600 Ω max. @ 24 V

Terminals 1-2: Auxiliary power

Provides DC power to measurement
circuit. Required for all CDTX-90
systems.

Terminals 7-10: Sensor input
7 is conductivity input
8 is temperature input
9 is the isolated signal ground
10 is the sensor earth ground

Terminals 5-6: Open-collector Output

• A transistor output, programmable (see CALIBRATE menu) as High or Low setpoint with
adjustable hysteresis and proportional pulse (to 400 pulses per minute maximum).

• May be disabled (Off) if not used.

CDTX-90-1 System Power/Loop Connections

page 3

Stand-alone application, no current loop used

Transmitter

Terminals

4
3
2
1

Sys. Pwr.
Loop ­Sys. Pwr.
Loop +
AUX
Power ­AUX
Power +

Power Supply
DC 12 - 24 V

Power
Supply
Power
Supply

Connection to a PLC with built-in power supply

PLC

Terminals

Power Supply
Ground
Power
Supply
Loop Input
4-20 mA
Loop Input
4-20 mA

Internal PLC
Connection

Connection to a PLC/Recorder, separate supply

PLC or Recorder

Loop Input
4-20 mA in
Loop Input
4-20 mA in

DC 12 - 24 V

Power
Supply
Power
Supply

Example: Two transmitters connected to PLC/Recorder

with separate power supply

Transmitter 2

4
3
2
1

DC 12 - 24 V

Power
Supply
Power
Supply

Transmitter 1

4
3
2
1

Transmitter

Terminals

4
3
2
1

Sys. Pwr.
Loop ­Sys. Pwr.
Loop +
AUX
Power ­AUX
Power +

Transmitter

Terminals

4
3
2
1

Sys. Pwr.
Loop ­Sys. Pwr.
Loop +
AUX
Power ­AUX
Power +

Sys. Pwr.
Loop ­Sys. Pwr.
Loop +
AUX
Power ­AUX
Power +

Sys. Pwr.
Loop ­Sys. Pwr.
Loop +
AUX
Power ­AUX
Power +

PLC or Recorder

Channel 1
4-20 mA in
Channel 1
4-20 mA in

Channel 2
4-20 mA in
Channel 2
4-20 mA in

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

AUX required for all CDTX-90 systems.

System Pwr
Loop -

System Pwr
Loop +

AUX
Power -

AUX
Power +

4
3
2
1

Sensr Gnd
(SHIELD)

Iso. Gnd
(BLACK)

Temp. IN
(WHITE)

Signal IN
(RED)

14
13
12
11

Relay 2
(NO)

Relay 2
(COM)

Relay 2
(NC)

Relay 1
(NO)

Relay 1
(COM)

Relay 1
(NC)

10

9
8
7
6
5

CDTX-90-2 Terminal Connections

Terminals 3 and 4: Loop Power

12-24 VDC ±10% system power
and current loop output.
Max. loop impedance:
50 Ω max. @ 12 V
325 Ω max. @ 18 V
600 Ω max. @ 24 V

Terminals 11-14: Sensor input
11 is conductivity input
12 is temperature input
13 is the isolated signal ground
14 is the sensor earth ground

Terminals 1-2: Auxiliary power

Provides DC power to sensor.
Required for all CDTX-90 systems.

CDTX-90-2 System Power/Loop Connections

Terminals 5-10: Relay Outputs

• Two SPDT mechanical relays, programmable as:

• High or Low setpoint with adjustable hysteresis.

• proportional Pulse (400 pulses per minute maximum).

• May be disabled (Off) if not used.

page 4

1

Internal open-collector

output circuit

Isolation

15W

S

D

_

CDTX-90-3 Terminal Connections

Terminals 3-6: Loop Power

12-24 VDC ±10% system power and current loop output.
Max. loop impedance:
50 Ω max. @ 12 V
325 Ω max. @ 18 V
600 Ω max. @ 24 V

Loop 2-

6

Loop 2+

5

10

Output 2-

Terminals 11-14: Sensor input
11 is conductivity input
12 is temperature input
13 is the isolated signal ground
14 is the sensor earth ground

System Pwr

4

Loop -

System Pwr

3

Loop +

AUX

2

Power -

AUX

1

Power +

Terminals 7-10: Open-collector Outputs

•Two transistor outputs, programmable

Terminals 1-2: Auxiliary power

Provides DC power to measurement
circuit. Required for all CDTX-90
systems.

as:

• High or Low setpoint with adjustable
hysteresis

• proportional pulse (to 400 pulses per
minute maximum)

• May be disabled (Off) if not used

CDTX-90-3 System Power/Loop Connections

Stand-alone application, no current loop used

Trans mi tte r

Termina ls

NC

Loop 2 –

Loop 2 +

System Power Loop 1 –

System Power Loop 1 +

AUX Power –

AUX Power +

6

NC

5

4

3

2

1

–
+

Power

S upply

12–24 V DC

9

8

7

Output 2+

Output 1-

Output 1+

Sensr Gnd

14

(SHIELD)

Iso. Gnd

13

(BLACK)

Temp. IN

12

(WHITE)

Signal IN
(RED)

11

Connection to a PLC with internal power supply

Loop 2 –

Loop 2 +

System Power Loop 1 –

System Power Loop 1 +

AUX Power –

AUX Power +

Transmitter

Termina ls

6

5

4

3

2

1

PLC

+
–

+
–

–
+

Internal

Connection

PLC Termina ls

Channel 2

4-20 mA

Channel 1

4-20 mA

Power

Supply

12–24 VDC

Two transmitters connected to a PLC/Recorder with separate power supply

+

Channel 1
4-20 mA in

–

+

Channel 2
4-20 mA in

–

–

Channel 3
4-20 mA in

+

–
+

–
+

Channel 4
4-20 mA in

Power

Supply

12–24 VDC

Loop 2 –

Loop 2 +

System Power Loop 1 –

System Power Loop 1 +

AUX Power –

AUX Power +

Trans mitter 1

Term inals

6

5

4

3

2

1

Trans mitter 2

Term inals

6

5

4

3

2

1

Loop 2 –

Loop 2 +

System Power Loop 1 –

System Power Loop 1 +

AUX Power –

AUX Power +

Connection to a PLC with internal power supply

Loop 2 –

Loop 2 +

System Power Loop 1 –

System Power Loop 1 +

AUX Power –

AUX Power +

Transmitter

Termina ls

6

5

4

3

2

1

PLC

+
–

+
–

–
+

Internal

Connection

PLC Termina ls

Channel 2

4-20 mA

Channel 1

4-20 mA

Power

Supply

12–24 VDC

page 5

Hysteresis

Time

Low Setpoint

Process

Hysteresis

Output active

Output inactive

High Setpoint

Process

10

5

Open collector or Relay Output

PlsRate: 0 to 100 Pulses/min.

endpoint

Pulse rate

0 pulses

100 pulses

Starting point

3.3 Relay and Open Collector Outputs

The Relay and Open Collector outputs can be used as a switch
that responds when the process value moves above or below a
setpoint, or they can be used to generate a pulsing signal with a
rate proportional to the process value.

• Low setpoint:

Output triggers when process is less than the setpoint.
The output will relax when the process moves above the setpoint
plus the hysteresis value.

• High setpoint:

Output triggers when process is greater than the setpoint.
The output will relax when the process moves below the setpoint
plus the hysteresis value.

• Proportional Pulsing

The output will generate a 100 mS pulse at the rate defi ned by
settings in the CALIBRATE menu.

In the example below:

• The output will be 0 pulses/min. when value is less than 5 μS.

• The output will be 50 pulses/min. when value is 7.5 μS.

• The output will be 100 when value is greater than 10 μS.

The starting point, endpoint and maximum pulse rate are select ­able in the CALIBRATE menu.

VIEW menu

• During normal operation, the transmitter displays the VIEW menu.

• When editing the CALIBRATE or OPTIONS menus, the transmitter will return to the VIEW menu if no
activity occurs for 10 minutes.

• To select a VIEW display, press the UP or DOWN arrow keys. The selections will scroll in a
continuous loop.

• Changing the VIEW display does not interrupt system operations.

• No key code is necessary to change display selection.

• Output settings cannot be edited from the VIEW menu.

CDTX-90 Series View Menu

Display Description

123.45 μS/cm

+67.89 ºC

The VIEW displays below are temporary. The permanent display will return after 10 minutes

Loop Output:

13.75 mA

Last CAL:
04-20-07

Monitor the Conductivity and Temperature values from the sensor.
This is the permanent display.

Monitor the Loop Current output.

Check the Last Calibration date.

Conductivity/Resistivity

62.50 uS/cm

25.0° C

ENTER

page 6

CDTX-90 Series Editing Procedure:

OPTIONS

CALIBRATE

VIEW

2s 5s

Press &
hold for
access:

ENTER

Step 1. Press and hold ENTER key:

• 2 seconds to select the CALIBRATE menu.

• 5 seconds to select the OPTIONS menu.

Step 2. The Key Code is UP-UP-UP-DOWN keys in sequence.

• After entering the Key Code, the display will show the fi rst item in the selected menu.

Step 3. Scroll menu with UP or DOWN arrow keys.
Step 4. Press RIGHT ARROW key to select menu item to be edited.

• The fi rst display element will begin fl ashing.

Step 5. Press UP or DOWN keys to edit the fl ashing element.

• RIGHT ARROW key advances the fl ashing element.

Step 6. Press ENTER key to save the new setting and return to Step 3.

Notes on Step 1:

• The View Menu is normally displayed.

• The CALIBRATE and OPTIONS menus require a KEY CODE.

Notes on Step 2:

If no key is pressed for 5 minutes while display is showing "Enter
Key Code", the display will return to the VIEW menu.

CALIBRATE: ----

Enter Key Code

Notes on Steps 3 and 4:

• Refer to pages 8-13 for complete listing of menu items and their use.

• From the Step 3 display, pressing the UP and DOWN keys simultaneously will
return the display to the VIEW menu.

• If no key is pressed for 10 minutes, display will also return to the VIEW menu.

Step 3: Finished Editing?

Press the UP and DOWN keys simultaneously after
saving the last setting to return to normal operation.

CALIBRATE: *---

Enter Key Code

CALIBRATE: **--

Enter Key Code

CALIBRATE: ***-

Enter Key Code

Cell Constant:

Standard >

Cell Constant:

Standard >

Output Setpnt:

20.0 uS >

First item in
CALIBRATE menu

Step 3

Step 4

Notes on Steps 5 and 6:

• All output functions remain active during editing.

• Only the fl ashing element can be edited.

• RIGHT ARROW key advances the fl ashing element in a continuous loop.

• Edited value is effective immediately after pressing ENTER key.

• If no key is pressed for 10 minutes unit will restore the last saved value and return to step 3.

• Step 6 (pressing ENTER key) always returns you to Step 3.

• Repeat steps 3-6 until all editing is completed.

Press the UP and DOWN keys simultaneously while
any element is fl ashing. This will recall the last saved
value of the item being edited and return you to Step 3.

Step 5: Made an Error?

Output Setpnt:

20.00 uS

Output Setpnt:

10.00 uS

Output Setpnt:

0.00 uS

1

Step 6

Output Setpnt:

19.00 uS >

Step 5

Output Setpnt:

9

.00 uS

1

Output Setpnt:

Saving

ENTER

page 7

CDTX-90-1 Calibrate Menu

Display

(Factory settings shown)

Description

Cell Constant:

Standard >

Cell: Standard

1 >

Cell: Custom

1.0000 >

Cond Units:

uS >

PPM Factor:

2.00 >

Set:

Temperature >

Set:

Conductivity >

Select CUSTOM only if you are connecting a certifi ed conductivity sensor. Select STANDARD
for all other systems.

For STANDARD sensors: Select from these options: 0.01, 0.1, 1.0, 10.0 or 20.0.

For CUSTOM sensors: Enter the precise cell constant from the certifi cate provided with your
sensor, or from the information label on the sensor.

Select from the following options: μS, mS, kΩ, MΩ, PPM

If the Units selection is PPM, you can set the ratio of Total Dissolved Solids to μS. See page
15 for additional information. The TDS factor can only be set in PPM.

Adjust the temperature of the system based on an accurate external reference.

For use with STANDARD sensors: Perform this single-point wet calibration for most accurate
results. Not required for CUSTOM sensors except for periodic system accuracy confi rmation.
Enter all zeroes to restore factory calibration to TEMP and COND settings.

Loop Source:

Cond >

Loop Range: uS

0.0000 → 100.000 >

Output Source:

Cond >

Output Mode:

Low >

Output Setpnt:

10.0000 uS >

Output Hys:

0.5000 uS >

Output Rng: uS

10.0000 → 40.0000 >

Output PlsRate:

120 Pulses/Min >

Last CAL:

04-20-07 >

Select the input source to be associated with the current loop output: Conductivity or
Temperature.

Select the minimum and maximum values for the current loop output.
Be sure to modify this setting if you change the Cond. Units.

Select the source for the Open Collector output: Conductivity or Temperature

Select the mode of operation for the Open Collector output.
Options available are High, Low or proportional Pulse.
The signal may be disabled (Off) if not in use.

In Low or High Mode, this Open Collector output will be activated when the process reaches
this value. Be sure to modify this setting if you change the Cond. Units.

The Open Collector output will be deactivated at Setpoint ± Hysteresis, depending on High or
Low Setpoint selection. (See details in section 3.3.)

In Pulse mode, set the process values where the proportional pulse will start and where it will
reach the maximum rate. Be sure to modify this setting if you change the Cond. Units.

In Pulse mode, set the maximum rate for the proportional Pulse output. The CDTX-90 will
accept any value from 0 to 400.

Use this “note pad” to record important dates, such as annual recertifi cation or scheduled
maintenance.

page 8

CDTX-90-1 Options Menu

Display

(Factory settings shown)

Contrast:
3 >

Cond Decimal:
****.* >

Averaging

Adjust the LCD contrast for best viewing. A setting of 1 is lower contrast, 5 is higher. In
general, select lower contrast if the display is in warmer ambient surroundings.

Set the decimal to the best resolution for your application. The display will auto matically
scale down to this restriction. Select *****., ****.*, ***.** **.*** or *.****

OFF provides the most instantaneous response to process changes. Select LOW (4 sec)
or HIGH (8 sec) averaging if your process experiences frequent or extreme fl uctuations.

O >

Loop Adjust:

4.00 mA >

Loop Adjust:

20.00 mA >

Adjust the minimum and maximum current output. The display
value represents the precise current output. Adjustment limits:

• 3.80 mA < 4.00 mA > 5.00 mA

• 19.00 mA < 20.00 mA > 21.00 ma
Use this setting to match the system output to any external device.

Temp Display:

ºC >

Select ºC or ºF

Temperature

Set the percent change in Conductivity caused by a 1ºC change in temperature. May be

Comp %: 2.00 >

from 0.00 to 10.00.

Description

Output Active:

Active HIGH: This setting is used to turn a device (pump, valve) ON at the setpoint.

Low >

Test Loop:
>

Test Output:

Active LOW: This setting is used to turn a device OFF at the setpoint.

Press UP and DOWN keys to manually order any output current value from 3.6 mA to

21.00 mA to test the output loop.

Press UP and DOWN keys to manually toggle the Open Collector output state.

>

page 9

CDTX-90-2 Calibrate Menu

Display

(Factory settings shown)

Description

Cell Constant:

Standard >

Cell: Standard

1 >

Cell: Custom

1.0000 >

Cond Units:

μS >

PPM Factor:

2.00 >

Set:

Temperature >

Set:

Conductivity >

Select CUSTOM only if you are connecting a certifi ed conductivity sensor. Select
STANDARD for all other systems.

For STANDARD sensors: Select from these options: 0.01, 0.1, 1.0, 10.0 or 20.0.

For CUSTOM sensors: Enter the precise cell constant from the certifi cate provided with
your sensor, or from the information label on the sensor.

Select from these options: μS, mS, kΩ, MΩ, PPM

If the Units selection is PPM, set the ratio of Total Dissolved Solids to μS. The maximum
allowable is 3 μS = 1 PPM. The TDS factor can only be set in PPM.

Adjust the temperature of the system based on an accurate external reference.

When using a h STANDARD sensor perform this single-point wet calibration for best
accuracy. Not required for CUSTOM sensors except for periodic calibration checks.

Loop Source:

Cond >

Loop Range: μS

0.0000 → 100.000 >

Relay1 Source:

Cond >

Relay1 Mode:

Low >

Relay1 Setpnt:

10.0000 μS >

Relay1 Hys: μS

0.5000 >

Relay1 Rng: μS

10.0000 → 40.0000 >

Relay1 PlsRate:

120 Pulses/Min >

Last CAL:

04-20-07 >

Select the input (Conductivity or Temperature) source to be associated with the current loop
output:

Select the minimum and maximum values for the current loop output.
Be sure to modify this setting if you change the Cond. Units.

Select the source (Conductivity or Temperature) for this relay output:

Select the mode of operation for the relay.
Options available are High, Low or proportional Pulse.
The relay may be disabled (Off) if not in use.

In Low or High Mode, the relay will be activated when the process reaches this value. Be
sure to modify this setting if you change the Cond. Units.

The relay will be deactivated at Setpoint ± Hysteresis, depending on High or Low Setpoint
selection.

In Pulse mode, set the process values where the proportional pulse will start and where it
will reach the maximum rate. Be sure to modify this setting if you change the Cond. Units.

In Pulse mode, set the maximum rate for the proportional Pulse. The transmitter will
accept any value from 0 to 400.

Use this “note pad” to record important dates, such as annual recertifi cation or scheduled
maintenance.

page 10

CDTX-90-2 Options Menu

Display

(Factory settings shown)

Contrast:

3 >

Cond Decimal:

****.* >

Averaging:

O >

Loop Adjust:

4.00 mA >

Loop Adjust:

20.00 mA >

Temp Display:

ºC >

Temperature

Comp %: 2.00 >

Description

Adjust the LCD contrast for best viewing. A setting of 1 is lower contrast, 5 is higher. In
general, select lower contrast if the display is in warmer ambient surroundings.

Set the decimal to the best resolution for your application. The display will automatically
scale down to this restriction. Select *****., ****.*, ***.** **.*** or *.****

OFF provides the most instantaneous response to process changes. Select LOW (4 sec)
or HIGH (8 sec) averaging if your process experiences frequent or extreme fl uctuations.

Adjust the minimum and maximum current output. The display
value represents the precise current output. Adjustment limits:

• 3.80 mA < 4.00 mA > 5.00 mA

• 19.00 mA < 20.00 mA > 21.00 ma
Use this setting to match the system output to any external device.

Select ºC or ºF.

Set the percent change in Conductivity caused by a 1ºC change in temperature. May be
from 0.00 to 10.00.

Test Loop:

>

Test Relay1:

Press UP and DOWN keys to manually order any output current value from 3.6 mA to

21.00 mA to test the output loop.

Press UP and DOWN keys to manually toggle the relay state.

>

page 11

CDTX-90-3 Calibrate Menu

Display

(Factory settings shown)

Description

Cell Constant:

Standard >

Cell: Standard

1 >

Cell: Custom

1.0000 >

Cond Units:

uS >

PPM Factor:

2.00 >

Set:

Temperature >

Set:

Conductivity >

Select CUSTOM only if you are connecting a certifi ed conductivity sensor. Select STANDARD
for all other systems.

For STANDARD sensors: Select from these options: 0.01, 0.1, 1.0, 10.0 or 20.0.

For CUSTOM sensors: Enter the precise cell constant from the certifi cate provided with your
sensor, or from the information label on the sensor.

Select from the following options: μS, mS, kΩ, MΩ, PPM

If the Units selection is PPM, you can set the ratio of Total Dissolved Solids to μS. See
section 3 of this manual for additional information. The TDS factor can only be set in PPM.

Adjust the temperature of the system based on an accurate external reference.

For use with STANDARD sensors: Perform this single-point wet calibration for most accurate
results. Not required for CUSTOM sensors except for periodic system accuracy confi rmation.
Enter all zeroes to restore factory calibration to TEMP and COND settings.

Loop1 Source:

Cond >

Loop1 Range: uS

0.0000 → 100.000 >

Output Source:

Cond >

Output1 Mode:

Low >

Output1 Setpnt:

10.0000 uS >

Output1 Hys:

0.5000 uS >

Output1 Rng: uS

10.0000 → 40.0000 >

Select the input source to be associated with the current loop output: Conductivity or
Temperature

Select the minimum and maximum values for the current loop output.
Be sure to modify this setting if you change the Cond. Units.

Select the source for the Open Collector output: Conductivity or Temperature

Select the mode of operation for the Open Collector output.
Options available are High, Low or proportional Pulse.
The signal may be disabled (Off) if not in use.

In Low or High Mode, this Open Collector output will be activated when the process reaches
this value. Be sure to modify this setting if you change the Cond. Units.

The Open Collector output will be deactivated at Setpoint ± Hysteresis, depending on High or
Low Setpoint selection. (See details on page 4.)

In Pulse mode, set the process values where the proportional pulse will start and where it will
reach the maximum rate. Be sure to modify this setting if you change the Cond. Units.

Output1 PlsRate:

120 Pulses/Min >

Last CAL:

In Pulse mode, set the maximum rate for the proportional Pulse output. The transmitter will
accept any value from 0 to 400.

Use this “note pad” to record important dates, such as annual recertifi cation or scheduled
maintenance.

04-20-07 >

Settings will repeat for Loop 2 and Output 2.

page 12

CDTX-90-3 Options Menu

Display

(Factory settings shown)

Contrast:
3 >

Cond Decimal:
****.* >

Averaging

O >

Loop1 Adjust:

4.00 mA >

Loop1 Adjust:

Adjust the LCD contrast for best viewing. A setting of 1 is lower contrast, 5 is higher. In
general, select lower contrast if the display is in warmer ambient surroundings.

Set the decimal to the best resolution for your application. The display will automatically
scale down to this restriction. Select *****., ****.*, ***.** **.*** or *.****

OFF provides the most instantaneous response to process changes. Select LOW (4 sec)
or HIGH (8 sec) averaging if your process experiences frequent or extreme fl uctuations.

Adjust the minimum and maximum current output. The display
value represents the precise current output. Adjustment limits:

• 3.80 mA < 4.00 mA > 5.00 mA

• 19.00 mA < 20.00 mA > 21.00 ma
Use this setting to match the system output to any external device.

20.00 mA >

Temp Display:

Select ºC or ºF

ºC >

Temperature

Comp %: 2.00 >

Set the percent change in Conductivity caused by a 1ºC change in temperature. May be
from 0.00 to 10.00.

Description

Output1 Active:

Active HIGH: This setting is used to turn a device (pump, valve) ON at the setpoint.

Low >

Test Loop 1:
>

Test Output 1:

Active LOW: This setting is used to turn a device OFF at the setpoint.

Press UP and DOWN keys to manually order any output current value from

3.6 mA to 21.00 mA to test the output loop.

Press UP and DOWN keys to manually toggle the Open Collector output state.

>

Settings will repeat for Loop 2 and Output 2.

page 13

Calibration Procedure

Iso. Gnd
(BLACK)

Temp. IN
(WHITE)

Signal IN
(RED)

9

8

7

Simulation resistor

TC resistor

1. Requirements

The CDTX-90 Transmitter is factory calibrated using simulated input signals. System calibration will reduce errors caused
by sensor wire lengths longer than the standard 15 ft. length. Wire lengths of 100 feet are acceptable; cable shield must be
maintained through cable splice. Calibration may be done by known solution value (A), or by resistance simulation (B).

A) Calibration with NIST Traceable Solutions:

When using NIST traceable standards, ensure the sensor and test solution are at the solution temperature specifi ed on the test
solution label. Prevent contamination of the calibration solution. Thoroughly rinse the sensor in a small amount of test solution
before placing in any test solution for calibration purposes.

B) Optional Verifi cation with Precision Resistors:

The use of precision resistors (±0.1%) connected to the rear "Temp In", "Signal IN", and "Iso Gnd" terminals in place of the
sensor, yields quick and accurate electronic instrument calibration. Calibration is completed as follows:

1) Select a standard cell constant based on desired range of operation.

2) Place a 1096 Ω (25°C) resistor between "Temp IN" and "Iso. Gnd" terminals as shown.
Note: Temperature simulation errors can adversely effect calibration: 3.85 per °C.

3) Calculate the required simulation resistor that represents a value within the selected cell
range. The formula for determining the required simulation resistance is:

Resistance = Sensor Cell
Desired conductivity (Siemens*) 0.000020 (Siemens*)

e.g. 0.1 Cell = 5,000 Ω or 5 KΩ

:

Conductivity = Sensor Cell
Simulation resistance (Ω) 100,000 (Ω) or 1μS/cm

e.g. 0.1 Cell = 0.000001 Siemens*

:

(*Conversion: 1 μS = 1 X 10-6 Siemens or 0.000001 Siemens)

4) Place the calculated simulation resistance between the "Signal IN" and "Iso Gnd" terminals as shown.

5) Set temperature and set conductivity. (Optional: Reset to factory calibration by entering zero as the "Set Conductivity" value.)

2. Temperature Coeffi cient

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

temperature. Place sensor in the sample solution allowing
several minutes for stabilization. Record displayed
temperature and conductivity values in the spaces provided:

of the solution.

Displayed temperature: T2 = _______ °C

Slopes can very signifi cantly depending on process solution type.

Displayed conductivity: C2 = _______ μS

The factory default temperature compensation factor is 2.00%/°C.
Process solutions may require adjustment for maximum accuracy.
To determine the optimum temperature compensation factor for a

(A 10% change in conductivity between steps 2 and 3 is

recommended.)

process:

4. Substitute recorded readings (steps 2 and 3) into the

1. Disable the temperature compensation % factor by entering

following formula:

0.00.

TC Slope = 100 x (C1 - C2)

2. Heat the sample solution close to the maximum process

(C2 x (T1 - 25)) - (C1 x (T2 - 25))
temperature. Place sensor in the sample solution allowing
several minutes for stabilization. Access the VIEW menu
and record the displayed temperature and conductivity
values in the spaces provided:

Example: A sample solution has a conductivity of 205 μS

@ 48°C. After cooling the solution, the conductivity was
measured at 150 μS @ 23 °C. (C1 = 205, T1 = 48, C2 =
150, T2 = 23)

Displayed temperature: T1 = _______ °C

The TC is calculated as follows:

Displayed conductivity: C1 = _______ μS

TC Slope = 100 x (205 - 150) = 5500 = 1.42%/°C

(Do not use this procedure for solutions from 0.055 μS to 0.1 μS

(150 x (48 - 25)) - (205 x (23 - 25)) 3860

(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.)

3. Cool the sample solution close to the minimum process

page 14

Parts Per Million (PPM) Factor

This feature is only applicable when PPM display units are selected. The programmable PPM Factor is adjustable from 0.01 to

3.00 (factory default = 2.00). Determine the best PPM Factor for a process solution by calculating the solution's conductivity (μS)
and the percent of total dissolved solids (PPM).

PPM Factor = Solution conductivity (μS)/cm
Total dissolved solids (PPM)

TDS (PPM) = Solution conductivity (μS)/cm
PPM Factor

Example: • Solution conductivity = 400 μS/cm

• TDS = 200 PPM (mg/L)

200 PPM

PPM Factor = 400 μS/cm = 2.00

Troubleshooting

Display Condition Suggested SolutionsPossible Causes

"- - - -"

Value Must be less
than 3

Value must be greater than 0

"Value must be
400 or less"

Display erratic, shows "0" or
"------" intermittently

Display is over range. This may be a
normal condition if your process operates
at/near the limits of the sensor range.
kΩ or MΩ units selected & sensor is open.

The PPM factor must be a value from

0.00 to 3.00

Custom cell constant cannot be set to 0

Pulse Rate cannot be greater than 400

Auxiliary Power not connected

Check sensor for correct range.
Check Decimal setting in OPTIONS menu.
Check Calibrate menu settings for incompatible
SOURCE and RANGE values.

Set a PPM value less than 3.

Set cell constant to a value greater than 0

set a pulse rate value less than 400

Connect Auxiliary power

"Too much Error
Check Sensor"

Defective or dirty/coated sensor
Wiring error

Clean or replace sensor

Check and correct wiring
Fluid conductivity too low
Defective temp element

Replace sensor

Technical notes

If a Current Loop is locked at 3.6 mA, the problem is related to the temperature circuit:
This occurs only if the CDTX-90 detects a resistance from the temperature sensor that is less than 250Ω or greater than 2800Ω.

• Check the sensor wiring for open/short or poor connections on white (TEMP IN) and black (ISO GND)wires.

• The PT1000 temperature device in the sensor is defective.

• The transmitter is defective.

Auxiliary Power (terminals 1 and 2) must ALWAYS be connected for the CDTX-90 to operate.

page 15

Notes

page 16

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13
months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal
one (1) year product warranty to cover handling and shipping time. This 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
conditions outside of OMEGA’s control. Components which wear are not warranted, including but not
limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for
any damages that result from the use of its products in accordance with information provided
by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it
will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF
TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component”
under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on
humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application, used on
humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY / DISCLAIMER
language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage
whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING
ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S
CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then
be marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in
transit.

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

1. Purchase Order number under which the product

2. Model and serial number of the product under

3. Repair instructions and/or speci c problems relative

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

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2000 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated,

or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA
ENGINEERING, INC.

was PURCHASED,

warranty, and

to the product.

FOR NON-WARRANTY REPAIRS,
repair charges. Have the following information available
BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST of the
repair,

2. Model and serial number of the product, and

3. Repair instructions and/or speci c problems relative
to the product.

consult OMEGA for current

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Process Measurement and Control?

OMEGA…Of Course!

Shop online at www.omega.com

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6-8850.090-OM/(D 10/08) M3632/1008