Omega CDTX-90 Series User manual

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User’s Guide
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CDTX-90 Series
Conductivity/Resistivity Transmitters
Conductivity/Resistivity
62.50 uS/cm
25.0°C
ENTER

page 2
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
apply. OMEGA is constantly pursuing certification of its products to the European New Approach
Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.
Servicing North America:
USA: One Omega Drive, P.O. Box 4047
ISO 9001 Certified Stamford CT 06907-0047
TEL: [phone] FAX: [phone]
e-mail: [email protected]
Canada: 976 Bergar
Laval (Quebec) H7L 5A1
TEL: [phone] FAX: [phone]
e-mail: [email protected]
For immediate technical or application assistance:
USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA®
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Toll Free in United Kingdom: 0800-488-488
e-mail: [email protected]
OMEGAnet®Online Service Internet e-mail
www.omega.com [email protected]

page 3
CAUTION!
•Remove power to unit before wiring
input and output connections.
•Follow instructions carefully to avoid
personal injury.
Omega CDTX-90 Series Conductivity/Resistivity Transmitter
Contents
1. Installation
2. Specifications
3. Electrical Connections
4. Menu Functions
2. Specifications
General
Compatible electrodes: Omega CDCE-90 Series Standard and
Certified Series Conductivity/Resistivity Electrodes
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 KΩto 18.2 MΩ
( Measurements from 10 MΩto 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:
•4to 20 mA, isolated, fully adjustable and reversible
•Max loop impedance: 50 Ωmax. @ 12 V
325 Ωmax. @ 18 V
600 Ωmax. @ 24 V
• 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
•CSA, CE, UL listed
•Immunity: EN50082-2
•Emissions: EN55011
•Safety: EN61010
•Manufactured under ISO 9001 and ISO 14001
•U.S.A. Patent # 5,708,363
1. Installation
CDTX-90 Series transmitters are available in two styles: panel mount and field 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 field 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.
SIDE VIEW
92 mm
(3.6 in.)
97 mm
(3.8 in.)
56 mm
(2.2 in.)
41 mm
(1.6 in.
)
Optional
Rear
Cover
Field Mount Panel Mount
FRONT VIEW
96 mm
(3.8 in.)
96 mm
(3.8 in.)
quick-clips
gasket panel
terminals mounting
bracket
latch
Output-
Output+
SystemPwr
Loop-
SystemPwr
Loop+
2
14
3
SensrGnd
(SHIELD)
SensrIN
(RED)
SensrV+
(BLACK)
7
6
5
SIDE VIEW
Field Mount &
Panel Mount
Panel Mount
Installation Detail
106 mm
(4.18 in.)
82 mm
(3.23 in.)
Conductivity/Resistivity
62.50 uS/cm
25.0°C
ENTER

page 4
Caution: Failure to fully open terminal jaws before removing wire may permanently damage instrument.
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.
2
1
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.
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 kΩto 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
(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
CDTX-90
≤ 100 ft. (30 m)
Conductivity/Resistivity
62.50 uS/cm
25.0°C
ENTER
14
13
12
11
Shield (Sensor Gnd)
Black (Iso Gnd)
White (Temp In)
Red (Signal In)
CDTX-90-2 Terminals
CDCE-90 Series Standard and Certified Cells
14
13
12
11
Shield (Sensor Gnd)
Black (Iso Gnd)
White (Temp In)
Red (Signal In)
CDTX-90-3 Terminals
10
9
8
7
Shield (Sensor Gnd)
Black (Iso Gnd)
White (Temp In)
Red (Signal In)
CDTX-90-1 Terminals
3.1 Sensor Connections
3. Electrical Connections

page 5
CDTX-90-1 System Power/Loop Connections
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 +
Terminals 5-6: Open-collector Output
•Atransistor 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.
Terminals 3 and 4: Loop Power
12-24 VDC ±10% system power
and current loop output.
Max. loop impedance:
50 Ωmax. @ 12 V
325 Ωmax. @ 18 V
600 Ωmax. @ 24 V
Internal open-collector
output circuit
Output --
Output +
Isolation
15Ω
S
D
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

page 6
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
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.
Terminals 3 and 4: Loop Power
12-24 VDC ±10% system power
and current loop output.
Max. loop impedance:
50 Ωmax. @ 12 V
325 Ωmax. @ 18 V
600 Ωmax. @ 24 V
Terminals 1-2: Auxiliary power
Provides DC power to sensor.
Required for all CDTX-90 systems.
CDTX-90-2 System Power/Loop Connections
CDTX-90-2 Terminal Connections
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

page 7
Stand-alone application, no current loop used
Transmitter
Terminals
6
5
4
3
2
1
Loop2-
Loop2+
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
Channel 2
4-20 mA in
Channel 2
4-20 mA in
Channel 1
4-20 mA in
Channel 1
4-20 mA in
Internal PLC
Connection
NC
NC
Connection to a PLC/Recorder, separate supply
PLC or Recorder
Channel 2
4-20 mA in
Channel 2
4-20 mA in
Channel 1
4-20 mA in
Channel 1
4-20 mA in
DC 12 - 24 V
Power
Supply
Power
Supply
PLC or Recorder
- Channel 4
+ Channel 4
- Channel 3
+ Channel 3
- Channel 2
+ Channel 2
- Channel 1
+ Channel 1
DC 12 - 24 V
Power
Supply
Power
Supply
Transmitter
Terminals
6
5
4
3
2
1
Loop2-
Loop2+
Sys. Pwr.
Loop -
Sys. Pwr.
Loop +
AUX
Power -
AUX
Power +
Transmitter
Terminals
6
5
4
3
2
1
Loop2-
Loop2+
Sys. Pwr.
Loop -
Sys. Pwr.
Loop +
AUX
Power -
AUX
Power +
6
5
4
3
2
1
Loop2-
Loop2+
Sys. Pwr.
Loop -
Sys. Pwr.
Loop +
AUX
Power -
AUX
Power +
6
5
4
3
2
1
Loop2-
Loop2+
Sys. Pwr.
Loop -
Sys. Pwr.
Loop +
AUX
Power -
AUX
Power +
Transmitter 1 Transmitter 2
Example: Two transmitters connected to PLC/Recorder
with separate power supply
-
+
-
+
-
+
-
+
-
+
-
+
-
+-
+
AUX power required for all CDTX-90 systems.
Sensr Gnd
(SHIELD)
Iso. Gnd
(BLACK)
Temp. IN
(WHITE)
Signal IN
(RED)
14
13
12
11
Output 2-
Output 2+
Output 1-
Output 1+
10
9
8
7
Loop 2-
Loop 2+
System Pwr
Loop -
System Pwr
Loop +
AUX
Power -
AUX
Power +
6
5
4
3
2
1
Terminals 7-10: Open-collector Outputs
•Two transistor outputs, programmable
as:
• High or Low setpoint with adjustable
hysteresis
• proportional pulse (to 400 pulses per
minute maximum)
• May be disabled (Off) if not used
Terminals 3-6: Loop Power
12-24 VDC ±10% system power and current loop output.
Max. loop impedance:
50 Ωmax. @ 12 V
325 Ωmax. @ 18 V
600 Ωmax. @ 24 V
1
Internal open-collector
output circuit
Outputs
Isolation
15Ω
S
D
2
_
+
Terminals 1-2: Auxiliary power
Provides DC power to measurement
circuit. Required for all CDTX-90
systems.
CDTX-90-3 System Power/Loop Connections
CDTX-90-3 Terminal Connections
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

page 8
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.
Hysteresis
Time
Low Setpoint
Process
Relay energized
Relay relaxed
Hysteresis
Time
High Setpoint
Process
CDTX-90 Series View Menu
Display Description
10
5
Open Collector Output Rate:
0 to 100 Pulses/min.
endpoint
Pulse rate
0 pulses
100 pulses
Starting point
•Proportional Pulsing
The output will generate a 100 mS pulse at the rate defined 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
selectable in the CALIBRATE menu.
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.
123.45 µS/cm
+67.89 ºC
Loop Output:
13.75 mA
Last CAL:
06-30-01
Monitor the Conductivity and Temperature values from the sensor.
This is the permanent display.
Monitor the Loop Current output.
Check the Last Calibration date.
The VIEW displays below are temporary. The permanent display will return after 10 minutes
Conductivity/Resistivity
62.50 uS/cm
25.0°C
ENTER

page 9
Notes on Steps 5 and 6:
• All output functions remain active during editing.
• Only the flashing element can be edited.
• RIGHT ARROW key advances the flashing 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.
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.
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.
CDTX-90 Series Editing Procedure:
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 first 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 first display element will begin flashing.
Step 5. Press UP or DOWN keys to edit the flashing element.
• RIGHT ARROW key advances the flashing element.
Step 6. Press ENTER key to save the new setting and return to Step 3.
OPTIONS
CALIBRATE
VIEW
2s 5s
Press &
hold for
access:
ENTER
Step 5
Step 6
Notes on Step 1:
• The View Menu is normally displayed.
• The CALIBRATE and OPTIONS menus require a KEY CODE.
Step 4
First item in
CALIBRATE menu
Step 3
Step 3: Finished Editing?
Press the UP and DOWN keys simultaneously after
saving the last setting to return to normal operation.
Press the UP and DOWN keys simultaneously
while any element is flashing. 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:
2 0.00 uS
Output Setpnt:
1 0.00 uS
ENTER
Output Setpnt:
10 .00 uS
Output Setpnt:
1
9
.00 uS
Output Setpnt:
Saving
Output Setpnt:
19.00 uS >
20.0 uS>
Output Setpnt:
Standard >
Cell Constant:
CALIBRATE: ----
Enter Key Code
CALIBRATE: *---
Enter Key Code
CALIBRATE: **--
Enter Key Code
CALIBRATE: ***-
Enter Key Code
Standard >
Cell Constant:

page 10
Select CUSTOM only if you are connecting a certified 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 certificate 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 confirmation.
Enter all zeroes to restore factory calibration to TEMP and COND settings.
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 recertification or scheduled
maintenance.
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 >
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:
06-30-01 >

page 11
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 fluctuations.
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.
Active HIGH: This setting is used to turn a device (pump, valve) ON at the
setpoint.
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.
Contrast:
3>
Cond Decimal:
****.* >
Averaging
Off >
Loop Adjust:
4.00 mA >
Loop Adjust:
20.00 mA >
Temp Display:
ºC>
Temperature
Comp %: 2.00 >
Output Active:
Low >
Test Loop: >
Test Output:
>
CDTX-90-1 Options Menu
Display
(Factory settings shown) Description

page 12
Cell Constant:
Standard >
Cell: Standard
1>
Cell: Custom
1.0000 >
Cond Units:
µS>
PPM Factor:
2.00 >
Set:
Temperature >
Set:
Conductivity >
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:
06-30-01 >
Select CUSTOM only if you are connecting a certified 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 certificate 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.
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 recertification or scheduled
maintenance.
CDTX-90-2 Calibrate Menu
Display
(Factory settings shown) Description

page 13
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 fluctuations.
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.
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.
Contrast:
3>
Cond Decimal:
****.* >
Averaging:
Off >
Loop Adjust:
4.00 mA >
Loop Adjust:
20.00 mA >
Temp Display:
ºC>
Temperature
Comp %: 2.00 >
Test Loop:
>
Test Relay1:
>
CDTX-90-2 Options Menu
Display
(Factory settings shown) Description

page 14
Select CUSTOM only if you are connecting a certified 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 certificate 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 confirmation.
Enter all zeroes to restore factory calibration to TEMP and COND settings.
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.
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 recertification or scheduled
maintenance.
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 >
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 >
Output1 PlsRate:
120 Pulses/Min >
Last CAL:
06-30-01 >
Settings will repeat for Loop 2 and Output 2.

page 15
Contrast:
3>
Cond Decimal:
****.* >
Averaging
Off >
Loop1 Adjust:
4.00 mA >
Loop1 Adjust:
20.00 mA >
Temp Display:
ºC>
Temperature
Comp %: 2.00 >
Output1 Active:
Low >
Test Loop 1: >
Test Output 1:
>
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 fluctuations.
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.
Active HIGH: This setting is used to turn a device (pump, valve) ON at the
setpoint.
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.
CDTX-90-3 Options Menu
Display
(Factory settings shown) Description
Settings will repeat for Loop 2 and Output 2.

page 16
Calibration Procedure
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 specified 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 Verification 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 :e.g. 0.1 Cell = 5,000 Ωor 5 KΩ
Desired conductivity (Siemens*) 0.000020 (Siemens*)
Conductivity = Sensor Cell :e.g. 0.1 Cell = 0.000001 Siemens*
Simulation resistance (Ω) 100,000 (Ω)or 1µS/cm
(*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.)
Iso. Gnd
(BLACK)
Temp. IN
(WHITE)
Signal IN
(RED)
9
8
7Simulation resistor
TC resistor
2. Temperature Coefficient
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
of the solution.
Slopes can very significantly depending on process solution type.
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
process:
1. Disable the temperature compensation % factor by entering
0.00.
2. Heat the sample solution close to the maximum process
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:
Displayed temperature: T1 = _______ °C
Displayed conductivity: C1 = _______ °C
(Do not use this procedure for solutions from 0.055 µS to 0.1 µS
(10 MΩto 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
temperature. Place sensor in the sample solution allowing
several minutes for stabilization. Record displayed
temperature and conductivity values in the spaces provided:
Displayed temperature: T2 = _______ °C
Displayed conductivity: C2 = _______ °C
(A 10% change in conductivity between steps 2 and 3 is
recommended.)
4. Substitute recorded readings (steps 2 and 3) into the
following formula:
TC Slope = 100 x (C1 - C2)
(C2 x (T1 - 25)) - (C1 x (T2 - 25))
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)
The TC is calculated as follows:
TC Slope = 100 x (205 - 150) =5500 = 1.42%/°C
(150 x (48 - 25)) - (205 x (23 - 25)) 3860

page 17
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
"Too much Error
Check Sensor"
Display is over range. This may be a
normal condition if your process operates
at/near the limits of the sensor range.
kΩor MΩunits 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
Defective or dirty/coated sensor
Wiring error
Fluid conductivity too low
Defective temp element
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
Clean or replace sensor
Check and correct wiring
Replace sensor
Troubleshooting
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)
PPM Factor = 400 µS/cm = 2.00
200 PPM
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 250Ωor 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.
Technical notes

page 18
Notes

page 19
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 was PURCHASED,
2. Model and serial number of the product under
warranty, and
3. Repair instructions and/or specific problems
relative to the product.
FOR NON-WARRANTY REPAIRS, consult OMEGA
for current 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 specific problems
relative to the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords
our customers the latest in technology and engineering.
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.

6-8850.090-OM/(C-8/02) M3632/0802
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