Omega Stud Sensor CDTX 90 User Manual

Use r s Gu id e  
Conductivity/Resistivity  
62.50 uS/cm  
25.0°C  
Shop online at  
ENTER  
www.omega.com  
e-mail: info@omega.com  
CDTX-90 Series  
Conductivity/ Resistivity Transmitters  
 
Omega CDTX-90 Series  
Conductivity/Resistivity  
CAUTION!  
Contents  
62.50 uS/cm  
25.0°C  
Remove power to unit before wiring  
1. Installation  
input and output connections.  
Follow instructions carefully to avoid  
personal injury.  
2. Specifications  
3. Electrical Connections  
4. Menu Functions  
ENTER  
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.  
panel  
gasket  
mounting  
bracket  
terminals  
Optional  
Rear  
92 mm  
82 mm  
96 mm  
(3.6 in.)  
(3.23 in.)  
(3.8 in.)  
Cover  
latch  
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3
96 mm  
106 mm  
(4.18 in.)  
56 mm  
(2.2 in.)  
(3.8 in.)  
41 mm  
(1.6 in.  
)
97 mm  
(3.8 in.)  
FRONT VIEW  
SIDE VIEW  
SIDE VUIEpWdate rate: 200 mS  
Panel Mount  
Field Mount &  
Panel Mount  
Panel Mount  
Compatible electrodes: Omega CDCFEie-l9d0MoSuentries Standard and  
Certified Series Conductivity/Resistivity Electrodes  
Accuracy: ±2% of reading  
quick-clips  
Installation Detail  
2. Specifications  
General  
Accuracy: ±0.03 mA @ 25°C, 24 V  
Relay outputs  
(CDTX-90-2 includes 2 mechanical SPDT contacts):  
Enclosure:  
Maximum voltage rating:  
Rating:  
Case:  
NEMA 4X/IP65 front  
PBT  
5 A @ 30 VDC, or 5 A @ 250 VAC, resistive load  
Programmable for:  
Panel case gasket: Neoprene  
High or Low setpoint with adjustable hysteresis  
Pulse operation (max. rate 400 pulses/min)  
Window:  
Polyurethane coated polycarbonate  
Keypad:  
Sealed 4-key silicone rubber  
Weight:  
Approx. 325g (12 oz.)  
Open-collector output, optically isolated:  
Display:  
50 mA max. sink, 30 VDC maximum pull-up voltage.  
Alphanumeric 2 x 16 LCD  
Programmable for:  
Contrast: User selected, 5 levels  
High or Low setpoint with adjustable hysteresis  
Update rate: 1.8 seconds  
Pulse operation (max. rate 400 pulses/min)  
Electrical  
Environmental  
Power: 12 to 24 VDC ±10%, regulated, 80 mA max.  
Operating temperature: -10 to 70°C (14 to 158°F)  
Storage temperature:  
Relative humidity:  
Maximum altitude:  
Insulation category:  
Pollution degree:  
-15 to 80°C (5 to 176°F)  
Sensor input range:  
0 to 95%, non-condensing  
Conductivity: 0.055 to 400,000 µS  
2000 m (6562 ft)  
Resistivity:  
10 Kto 18.2 MΩ  
II  
2
( Measurements from 10 Mto 18 M(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  
Standards and Approvals  
Temperature: PT 1000, -25 to 120°C (-13 to 248°F)  
CSA, CE, UL listed  
Current output:  
Immunity:  
Emissions:  
Safety:  
EN50082-2  
4 to 20 mA, isolated, fully adjustable and reversible  
EN55011  
EN61010  
Max loop impedance:  
50 max. @ 12 V  
325 max. @ 18 V  
600 max. @ 24 V  
Manufactured under ISO 9001 and ISO 14001  
U.S.A. Patent # 5,708,363  
page 3  
 
Ultra-  
Pure Pure Rinse  
CDCE-90-20  
CDCE-90-10  
Sensor Selection  
CDCE-90-1  
Select the sensor with a range closest to your process minimum and  
CDCE-90-01  
maximum values.  
CDCE-90-001  
• CDCE-90-001 (0.01 cell): 0.055 to 100 µS (10 kto 18 M)  
Use the CDCE-90-001 for all resistivity requirements  
0.055ꢀ  
1ꢀ  
10ꢀ 100ꢀ 200ꢀ  
1,000ꢀ 10,000ꢀ  
200,000ꢀ 400,000  
CDCE-90-01 (0.1 cell):  
CDCE-90-1 (1.0 cell):  
1 to 1000 µS  
(10 kΩ)  
(18 MΩ)  
10 to 10,000 µS  
Conductivity Range (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:  
CDTX-90  
Do not route sensor cable in conduit containing AC power  
Conductivity/Resistivity  
62.50 uS/cm  
wiring. Electrical noise may interfere with sensor signal.  
≤ 100 ft. (30 m)  
25.0°C  
Routing sensor cable in grounded metal conduit will help  
prevent electrical noise and mechanical damage.  
ENTER  
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.  
Wiring Procedure  
2
1
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.  
CDTX-90-1 Terminals  
3.1 Sensor Connections  
Shield (Sensor Gnd)  
10  
9
Black (Iso Gnd)  
White (Temp In)  
Red (Signal In)  
8
7
CDTX-90-2 Terminals  
Shield (Sensor Gnd)  
14  
13  
12  
11  
Black (Iso Gnd)  
White (Temp In)  
Red (Signal In)  
CDCE-90 Series Standard and Certified Cells  
CDTX-90-3 Terminals  
Shield (Sensor Gnd)  
14  
13  
12  
11  
Black (Iso Gnd)  
White (Temp In)  
Red (Signal In)  
page 4  
 
Terminals 3 and 4: Loop Power  
12-24 VDC ±10% system power  
and current loop output.  
Max. loop impedance:  
50 max. @ 12 V  
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  
325 max. @ 18 V  
600 max. @ 24 V  
System Pwr  
Sensr Gnd  
4
3
2
1
10  
Loop -  
(SHIELD)  
System Pwr  
Loop +  
Iso. Gnd  
Output -  
Output +  
6
5
9
(BLACK)  
AUX  
Temp. IN  
Power -  
8
(WHITE)  
AUX  
Signal IN  
Power +  
7
(RED)  
Internal open-collector  
output circuit  
Terminals 1-2: Auxiliary power  
15  
Provides DC power to measurement  
S
Output --  
Output +  
circuit. Required for all CDTX-90  
systems.  
D
Isolation  
Terminput  
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  
Stand-alone application, no current loop used  
Connection to a PLC with built-in power supply  
Transmitter  
PLC  
Transmitter  
Terminals  
Sys. Pwr.  
Power Supply  
DC 12 - 24 V  
Power  
Terminals  
Termin1als  
Power Supply  
Ground  
Sys. Pwr.  
-
+
-
4
4
Loop -  
Loop -  
-
Supply  
Power  
Supply  
Sys. Pwr.  
Sys. Pwr.  
Loop +  
Power  
Supply  
3
3
2
Loop +  
+
Loop Input  
4-20 mA  
AUX  
AUX  
2
Power -  
Power -  
AUX  
1
AUX  
Loop Input  
4-20 mA  
+
Power +  
Power +  
Internal PLC  
Connection  
Example: Two transmitters connected to PLC/Recorder  
Connection to a PLC/Recorder, separate supply  
with separate power supply  
Transmitter 1  
Sys. Pwr.  
DC 12 - 24 V  
DC 12 - 24 V  
Loop -  
4
Transmitter  
Power  
Supply  
Power  
Supply  
Sys. Pwr.  
-
3
Loop +  
Terminals  
Power  
Supply  
AUX  
Power  
Supply  
+
2
Power -  
Sys. Pwr.  
AUX  
Loop -  
4
1
Power +  
PLC or Recorder  
PLC or Recorder  
Sys. Pwr.  
3
Loop +  
Loop Input  
Channel 1  
Transmitter 2  
-
4-20 mA in  
4-20 mA in  
-
AUX  
Sys. Pwr.  
2
Power -  
Loop Input  
Loop -  
4
Channel 1  
+
4-20 mA in  
+
4-20 mA in  
AUX  
1
Sys. Pwr.  
Power +  
Loop +  
3
2
1
Channel 2  
-
4-20 mA in  
AUX  
Power -  
AUX power required for all CDTX-90 systems.  
Channel 2  
4-20 mA in  
+
AUX  
Power +  
page 5  
 
Terminals 3 and 4: Loop Power  
12-24 VDC ±10% system power  
and current loop output.  
Max. loop impedance:  
Terminals 11-14: Sensor input  
11 is conductivity input  
12 is temperature input  
50 max. @ 12 V  
13 is the isolated signal ground  
14 is the sensor earth ground  
325 max. @ 18 V  
600 max. @ 244 V  
Relay 2  
10  
9
(NO)  
Relay 2  
(COM)  
System Pwr  
Relay 2  
(NC)  
Sensr Gnd  
8
14  
Loop -  
(SHIELD)  
System Pwr  
Relay 1  
(NO)  
Iso. Gnd  
3
7
13  
Loop +  
(BLACK)  
AUX  
Temp. IN  
Relay 1  
6
2
Power -  
12  
(WHITE)  
(COM)  
AUX  
Signal IN  
Relay 1  
5
Power +  
1
(RED)  
11  
(NC)  
Terminals 5-10: Relay Outputs  
Terminals 1-2: Auxiliary power  
Provides DC power to sensor.  
Required for all CDTX-90 systems.  
• 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.  
CDTX-90-2 System Power/Loop Connections  
Connection to a PLC with built-in power supply  
Stand-alone a4pplication, no current loop used  
PLC  
Transmitter  
Transmitter  
Terminals  
Power Supply  
Power Supply  
Ground  
-
+
-
DC 12 - 24 V  
Terminals  
Power  
Terminals  
Supply  
Sys. Pwr.  
Power  
Loop Input  
4-20 mA  
Loop Input  
4-20 mA  
-
Sys. Pwr.  
Loop -  
Sys. Pwr.  
Loop +  
AUX  
Supply  
Power  
Supply  
4
Loop -  
Sys. Pwr.  
3
2
1
+
3
+
Loop +  
AUX  
Power -  
2
Internal PLC  
Connection  
with separate power supply  
Power -  
AUX  
AUX  
Power +  
Power +  
1
Example: Two transmitters connected to PLC/Recorder  
Connection to a PLC/Recorder, separate supply  
Transmitter 1  
DC 12 - 24 V  
Transmitter  
Sys. Pwr.  
DC 12 - 24 V  
4
Loop -  
PLC PoorwRerecorder  
-
Sys. Pwr.  
Supply  
Power  
Supply  
PLCPoorweRr ecorder  
3
-
Loop +  
Supply  
+
AUX  
Power  
Power -  
2
+
Supply  
AUX  
Terminals  
Power +  
1
Loop Input  
Sys. Pwr.  
4
-
4-20 mA in  
Loop -  
Transmitter 2  
Channel 1  
Loop Input  
Sys. Pwr.  
-
Sys. Pwr.  
+
3
4-20 mA in  
4-20 mA in  
Loop +  
4
Loop -  
Channel 1  
AUX  
+
Sys. Pwr.  
4-20 mA in  
2
Power -  
Loop +  
AUX  
3
2
1
AUX  
Channel 2  
-
Power +  
1
4-20 mA in  
Power -  
AUX  
Channel 2  
+
4-20 mA in  
Power +  
AUX required for all CDTX-90 systems.  
page 6  
 
Terminals 3-6: Loop Power  
12-24 VDC ±10% system power and current loop output.  
Max. loop impedance:  
50 max. @ 12 V  
325 max. @ 18 V  
600 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  
Loop 2-  
Output 2-  
6
5
4
3
2
1
10  
Loop 2+  
System Pwr  
Sensr Gnd  
Output 2+  
Output 1-  
9
8
14  
13  
12  
11  
Loop -  
(SHIELD)  
Iso. Gnd  
System Pwr  
Loop +  
AUX  
(BLACK)  
Temp. IN  
Power -  
(WHITE)  
AUX  
Signal IN  
(RED)  
Output 1+  
7
Power +  
Terminals 7-10: Open-collector Outputs  
•Two transistor outputs, programmable  
as:  
Internal open-collector  
output circuit  
Outputs  
1
Terminals 1-2: Auxiliary power  
Provides DC power to measurement  
circuit. Required for all CDTX-90  
systems.  
2
15  
S
• High or Low setpoint with adjustable  
_
hysteresis  
• proportional pulse (to 400 pulses per  
+
D
minute maximum)  
Isolation  
• May be disabled (Off) if not used  
CDTX-90-3 System Power/Loop Connections  
Connection to a P5LC with built-in power supply  
Stand-alone application, no current loop used  
Transmitter  
Transmitter  
PLC  
Terminals  
Termin3als  
Terminals  
Power Supply  
Loop2-  
Loop2+  
Power Supply  
Loop2-  
Loop2+  
DC 12 - 24 V  
6
5
4
3
2
1
-
6
NC  
NC  
Ground  
Power  
+
Supply  
Power  
Channel 2  
4-20 mA in  
Channel 2  
4-20 mA in  
Channel 1  
4-20 mA in  
Channel 1  
4-20 mA in  
Sys. Pwr.  
Sys. Pwr.  
Loop -  
-
+
-
-
Supply  
4
Loop -  
Power  
Sys. Pwr.  
Loop +  
AUX  
Sys. Pwr.  
Loop +  
AUX  
+
Supply  
Power -  
AUX  
ExamPpolwee:r -Two transmitters connected to PLC/Recorder  
2
AUX  
+
Power +  
Power +  
1
Internal PLC  
Connection  
Connection to a PLC/Recorder, separate supply  
with separate power supply  
Loop2-  
6
Transmitter  
DC 12 - 24 V  
Loop2+  
5
PLC PoorwRerecorder  
-
Sys. Pwr.  
Terminals  
Supply  
Power  
Supply  
4
Loop -  
DC 12 - 24 V  
Sys. Pwr.  
+
Loop2-  
3
Loop +  
PLCPoorwRerecorder  
6
-
AUX  
Supply  
Power  
Supply  
Loop2+  
2
Power -  
AUX  
5
+
Channel 2  
Power +  
1
Sys. Pwr.  
-
4
4-20 mA in  
Loop -  
Channel 2  
Loop2-  
Sys. Pwr.  
+
6
5
4
3
2
1
3
4-20 mA in  
Loop +  
-
Channel 4  
Channel 4  
Channel 3  
Channel 3  
Channel 2  
Channel 2  
Channel 1  
Channel 1  
Channel 1  
Loop2+  
AUX  
-
+
-
4-20 mA in  
2
Power -  
Sys. Pwr.  
Channel 1  
AUX  
+
+
-
Loop -  
4-20 mA in  
1
Power +  
Sys. Pwr.  
Loop +  
AUX  
+
-
Power -  
AUX  
+
AUX power required for all CDTX-90 systems.  
Power +  
page 7  
 
Proportional Pulsing  
The Relay and Open Collector outputs can be used as a switch  
that responds when the process value moves above or below a  
The output will generate a 100 mS pulse at the rate defined by  
settings in the CALIBRATE menu.  
setpoint, or they can be used to generate a pulsing signal with a  
rate proportional to the process value.  
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.  
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.  
The starting point, endpoint and maximum pulse rate are  
selectable in the CALIBRATE menu.  
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.  
Process  
100 pulses  
Hysteresis  
Low Setpoint  
0 to 100 Pulses/min.  
Open Collector Output Rate:  
Time  
Relay energized  
Relay relaxed  
0 pulses  
Process  
10  
5
Starting point  
endpoint  
High Setpoint  
Hysteresis  
Time  
VIEW menu  
During normal operation, the transmitter displays the VIEW menu.  
Conductivity/Resistivity  
When editing the CALIBRATE or OPTIONS menus, the transmitter will return to the VIEW menu  
if no activity occurs for 10 minutes.  
62.50 uS/cm  
25.0°C  
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.  
ENTER  
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  
Monitor the Conductivity and Temperature values from the sensor.  
This is the permanent display.  
123.45 µS/cm  
+67.89 ºC  
The VIEW displays below are temporary. The permanent display will return after 10 minutes  
Loop Output:  
Monitor the Loop Current output.  
13.75 mA  
Last CAL:  
06-30-01  
Check the Last Calibration date.  
page 8  
 
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.  
Notes on Step 1:  
Notes on Step 2:  
• The View Menu is normally displayed.  
If no key is pressed for 5 minutes while display is showing "Enter  
Key Code", the display will return to the VIEW menu.  
• The CALIBRATE and OPTIONS menus require a KEY CODE.  
CALIBRATE: ----  
Enter Key Code  
Press &  
ENTER  
hold for  
access:  
CALIBRATE: *---  
Enter Key Code  
CALIBRATE: **--  
Enter Key Code  
VIEW  
2s  
5s  
CALIBRATE: ***-  
Enter Key Code  
BRATE  
Cell Constant:  
First item in  
IONS  
Standard >  
CALIBRATE menu  
Notes on Steps 3 and 4:  
• Refer to pages 8-13 for complete listing of menu items and their use.  
Cell Constant:  
• From the Step 3 display, pressing the UP and DOWN keys simultaneously will  
Standard >  
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  
Step 3: Finished Editing?  
Output Setpnt:  
20.0 uS >  
Step 4  
Press the UP and DOWN keys simultaneously after  
saving the last setting to return to normal operation.  
Notes on Steps 5 and 6:  
Output Setpnt:  
20.00 uS  
• All output functions remain active during editing.  
• Only the flashing element can be edited.  
Output Setpnt:  
10.00 uS  
• RIGHT ARROW key advances the flashing element in a continuous loop.  
Step 5  
• 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.  
Output Setpnt:  
10.00 uS  
• Repeat steps 3-6 until all editing is completed.  
Output Setpnt:  
19.00 uS  
Step 5: Made an Error?  
ENTER  
Step 6  
Press the UP and DOWN keys simultaneously  
while any element is flashing. This will recall the  
Output Setpnt:  
Saving  
last saved value of the item being edited and  
return you to Step 3.  
Output Setpnt:  
19.00 uS >  
page 9  
 
Display  
Description  
(Factory settings shown)  
Select CUSTOM only if you are connecting a certified conductivity sensor. Select  
STANDARD for all other systems.  
Cell Constant:  
Standard  
>
For STANDARD sensors: Select from these options: 0.01, 0.1, 1.0, 10.0 or 20.0.  
Cell: Standard  
1
>
>
>
>
>
>
>
For CUSTOM sensors: Enter the precise cell constant from the certificate provided with your  
sensor, or from the information label on the sensor.  
Cell: Custom  
1.0000  
Select from the following options: µS, mS, k, M, PPM  
Cond Units:  
uS  
If the Units selection is PPM, you can set the ratio of Total Dissolved Solids to µS. See page  
PPM Factor:  
2.00  
15 for additional information. The TDS factor can only be set in PPM.  
Set:  
Adjust the temperature of the system based on an accurate external reference.  
Temperature  
Set:  
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.  
Conductivity  
Loop Source:  
Cond  
Select the input source to be associated with the current loop output: Conductivity or  
Temperature.  
Loop Range: uS  
Select the minimum and maximum values for the current loop output.  
Be sure to modify this setting if you change the Cond. Units.  
0.0000 100.000 >  
Output Source:  
Select the source for the Open Collector output: Conductivity or Temperature  
Cond  
>
>
>
>
Output Mode:  
Low  
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.  
Output Setpnt:  
10.0000 uS  
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.  
Output Hys:  
0.5000 uS  
The Open Collector output will be deactivated at Setpoint ± Hysteresis, depending on High or  
Low Setpoint selection. (See details in section 3.3.)  
Output Rng: uS  
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.  
10.0000 40.0000 >  
Output PlsRate:  
In Pulse mode, set the maximum rate for the proportional Pulse output. The CDTX-90 will  
accept any value from 0 to 400.  
120 Pulses/Min >  
Last CAL:  
Use this “note pad” to record important dates, such as annual recertification or scheduled  
maintenance.  
06-30-01  
>
page 10  
 
Display  
Description  
(Factory settings shown)  
Contrast:  
3
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.  
>
>
Cond Decimal:  
Set the decimal to the best resolution for your application. The display will auto-  
matically scale down to this restriction. Select *****., ****.*, ***.** **.*** or *.****  
****.*  
Averaging  
Off  
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.  
>
Loop Adjust:  
4.00 mA  
Loop Adjust:  
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  
Set the percent change in Conductivity caused by a 1ºC change in temperature.  
May be from 0.00 to 10.00.  
Comp %: 2.00  
Output Active:  
Active HIGH: This setting is used to turn a device (pump, valve) ON at the  
setpoint.  
Low  
Test Loop:  
>
>
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.  
Test Output:  
Press UP and DOWN keys to manually toggle the Open Collector output state.  
>
page 11  
 
Display  
Description  
(Factory settings shown)  
Cell Constant:  
Standard  
Select CUSTOM only if you are connecting a certified conductivity sensor. Select  
STANDARD for all other systems.  
>
>
>
>
>
>
>
>
Cell: Standard  
1
For STANDARD sensors: Select from these options: 0.01, 0.1, 1.0, 10.0 or 20.0.  
Cell: Custom  
1.0000  
For CUSTOM sensors: Enter the precise cell constant from the certificate provided with  
your sensor, or from the information label on the sensor.  
Cond Units:  
Select from these options: µS, mS, k, M, PPM  
µS  
PPM Factor:  
2.00  
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.  
Set:  
Adjust the temperature of the system based on an accurate external reference.  
Temperature  
Set:  
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.  
Conductivity  
Loop Source:  
Cond  
Select the input (Conductivity or Temperature) source to be associated with the current  
loop output:  
Loop Range: µS  
Select the minimum and maximum values for the current loop output.  
Be sure to modify this setting if you change the Cond. Units.  
0.0000 100.000 >  
Relay1 Source:  
Select the source (Conductivity or Temperature) for this relay output:  
Cond  
>
>
>
>
Relay1 Mode:  
Low  
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.  
Relay1 Setpnt:  
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.  
10.0000 µS  
Relay1 Hys: µS  
The relay will be deactivated at Setpoint ± Hysteresis, depending on High or Low Setpoint  
selection.  
0.5000  
Relay1 Rng: µS  
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.  
10.0000 40.0000 >  
Relay1 PlsRate:  
In Pulse mode, set the maximum rate for the proportional Pulse. The transmitter will  
accept any value from 0 to 400.  
120 Pulses/Min  
>
>
Last CAL:  
06-30-01  
Use this “note pad” to record important dates, such as annual recertification or scheduled  
maintenance.  
page 12  
 
Display  
Description  
(Factory settings shown)  
Contrast:  
3
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.  
>
>
>
Cond Decimal:  
****.*  
Set the decimal to the best resolution for your application. The display will automatically  
scale down to this restriction. Select *****., ****.*, ***.** **.*** or *.****  
Averaging:  
Off  
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.  
Loop Adjust:  
4.00 mA  
Loop Adjust:  
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  
Set the percent change in Conductivity caused by a 1ºC change in temperature. May be  
from 0.00 to 10.00.  
Comp %: 2.00  
Test Loop:  
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.  
Test Relay1:  
Press UP and DOWN keys to manually toggle the relay state.  
>
page 13  
 
Display  
Description  
(Factory settings shown)  
Cell Constant:  
Select CUSTOM only if you are connecting a certified conductivity sensor. Select  
STANDARD for all other systems.  
Standard  
>
Cell: Standard  
1
For STANDARD sensors: Select from these options: 0.01, 0.1, 1.0, 10.0 or 20.0.  
>
>
>
>
>
>
>
Cell: Custom  
1.0000  
For CUSTOM sensors: Enter the precise cell constant from the certificate provided with your  
sensor, or from the information label on the sensor.  
Cond Units:  
uS  
Select from the following options: µS, mS, k, M, PPM  
PPM Factor:  
2.00  
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.  
Set:  
Adjust the temperature of the system based on an accurate external reference.  
Temperature  
Set:  
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.  
Conductivity  
Loop1 Source:  
Cond  
Select the input source to be associated with the current loop output: Conductivity or  
Temperature  
Loop1 Range: uS  
Select the minimum and maximum values for the current loop output.  
Be sure to modify this setting if you change the Cond. Units.  
0.0000 100.000 >  
Output Source:  
Select the source for the Open Collector output: Conductivity or Temperature  
Cond  
>
>
>
>
Output1 Mode:  
Low  
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.  
Output1 Setpnt:  
10.0000 uS  
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.  
Output1 Hys:  
0.5000 uS  
The Open Collector output will be deactivated at Setpoint ± Hysteresis, depending on High or  
Low Setpoint selection. (See details on page 4.)  
Output1 Rng: uS  
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.  
10.0000 40.0000 >  
Output1 PlsRate:  
In Pulse mode, set the maximum rate for the proportional Pulse output. The transmitter will  
accept any value from 0 to 400.  
120 Pulses/Min >  
Last CAL:  
Use this “note pad” to record important dates, such as annual recertification or scheduled  
maintenance.  
06-30-01  
>
Settings will repeat for Loop 2 and Output 2.  
page 14  
 
Display  
Description  
(Factory settings shown)  
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.  
Contrast:  
3
>
>
Set the decimal to the best resolution for your application. The display will  
automatically scale down to this restriction. Select *****., ****.*, ***.** **.*** or  
*.****  
Cond Decimal:  
****.*  
OFF provides the most instantaneous response to process changes. Select  
Averaging  
Off  
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:  
Loop1 Adjust:  
4.00 mA  
>
>
• 3.80 mA < 4.00 mA > 5.00 mA  
• 19.00 mA < 20.00 mA > 21.00 ma  
Loop1 Adjust:  
20.00 mA  
Use this setting to match the system output to any external device.  
Select ºC or ºF  
Temp Display:  
ºC  
>
>
Set the percent change in Conductivity caused by a 1ºC change in temperature.  
Temperature  
May be from 0.00 to 10.00.  
Comp %: 2.00  
Active HIGH: This setting is used to turn a device (pump, valve) ON at the  
Output1 Active:  
Low  
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.  
Test Loop 1:  
Press UP and DOWN keys to manually toggle the Open Collector output state.  
Test Output 1:  
>
Settings will repeat for Loop 2 and Output 2.  
page 15  
 
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.  
Iso. Gnd  
9
8
7
2) Place a 1096 (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:  
(BLACK)  
Temp. IN  
(WHITE)  
TC resistor  
Signal IN  
(RED)  
Simulation resistor  
Sensor Cell  
0.1 Cell  
Resistance  
=
e.g.  
= 5,000 or 5 KΩ  
:
Desired conductivity (Siemens*)  
0.000020 (Siemens*)  
Sensor Cell  
0.1 Cell  
0.000001 Siemens*  
Conductivity =  
:
e.g.  
=
Simulation resistance ()  
100,000 ()  
or 1µS/cm  
-6  
(*Conversion: 1 µS = 1 X 10 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 Coefficient  
3. Cool the sample solution close to the minimum process  
temperature. Place sensor in the sample solution allowing  
several minutes for stabilization. Record displayed  
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.  
temperature and conductivity values in the spaces provided:  
Displayed temperature:  
Displayed conductivity:  
T2 = _______ °C  
Slopes can very significantly depending on process solution type.  
C2 = _______ °C  
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:  
(A 10% change in conductivity between steps 2 and 3 is  
recommended.)  
4. Substitute recorded readings (steps 2 and 3) into the  
1. Disable the temperature compensation % factor by entering  
following formula:  
0.00.  
100 x (C1 - C2)  
2. Heat the sample solution close to the maximum process  
TC Slope =  
(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 = _______ °C  
100 x (205 - 150)  
5500  
(Do not use this procedure for solutions from 0.055 µS to 0.1 µS  
TC Slope =  
=
=1.42%/°C  
(150 x (48 - 25)) - (205 x (23 - 25)) 3860  
(10 Mto 18 M). An internal pure water curve is used for these  
ranges. The factory default setting of 2.00%/°C should be used.)  
page 16  
 
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).  
Solution conductivity (µS)/cm  
PPM Factor =  
Total dissolved solids (PPM)  
Solution conductivity (µS)/cm  
TDS (PPM) =  
PPM Factor  
Example:  
• Solution conductivity = 400 µS/cm  
• TDS = 200 PPM (mg/L)  
400 µS/cm  
PPM Factor =  
= 2.00  
200 PPM  
Troubleshooting  
Display Condition  
Possible Causes  
Suggested Solutions  
Display is over range. This may be a  
Check sensor for correct range.  
"- - - -"  
normal condition if your process operates  
Check Decimal setting in OPTIONS menu.  
at/near the limits of the sensor range.  
Check Calibrate menu settings for incompatible  
kor Munits selected & sensor is open. SOURCE and RANGE values.  
The PPM factor must be a value from  
Set a PPM value less than 3.  
Value Must be less  
than 3  
0.00 to 3.00  
Custom cell constant cannot be set to 0  
Pulse Rate cannot be greater than 400  
Auxiliary Power not connected  
Set cell constant to a value greater than 0  
set a pulse rate value less than 400  
Connect Auxiliary power  
Value must be greater than 0  
"Value must be  
400 or less"  
Display erratic, shows "0" or  
"------" intermittently  
Defective or dirty/coated sensor  
Wiring error  
Clean or replace sensor  
Check and correct wiring  
"Too much Error  
Check Sensor"  
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 250or greater than 2800.  
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 17  
 
page 18  
 
WARRANTY/DIS CLAIMER  
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in m aterials and workm anship for a  
period of 1 3 m o n t h s from date of purchase. OMEGA’s WARRANTY adds an additional one (1) m onth  
grace period to the norm al o n e (1 ) ye a r p ro d u c t w a rra n t y to cover handling and shipping tim e. This  
ensures that OMEGA’s custom ers receive m axim um coverage on each product.  
If the unit m alfunctions, it m ust be returned to the factory for evaluation. OMEGA’s Custom er Service  
Departm ent will issue an Authorized Return (AR) num ber im m ediately upon phone or written request.  
Upon exam ination 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 lim ited to m ishandling, im proper interfacing, operation outside of design lim its,  
im proper repair, or unauthorized m odification. 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, m oisture or vibration; im proper specification; m isapplication; m isuse or other operating  
conditions outside of OMEGA’s control. Com ponents which wear are not warranted, including but not  
lim ited to contact points, fuses, and triacs.  
OMEGA is p le a s e d t o o ffe r s u g g e s t io n s o n t h e u s e o f it s va rio u s p ro d u c t s . Ho w e ve r,  
OMEGA neither assum es responsibility for any om issions or errors nor assum es liability for any  
d a m a g e s t h a t re s u lt fro m t h e u s e o f it s p ro d u c t s in a c c o rd a n c e w it h in fo rm a t io n p ro vid e d  
by OMEGA, either verbal or w ritten. OMEGA w arrants only that the parts m anufactured by it  
w ill b e a s s p e c ifie d a n d fre e o f d e fe c t s . OMEGA MAKES NO OTHER WARRANTIES OR  
REP RES ENTATIONS OF ANY KIND WHATS OEVER, EXP RES S OR IMP LIED, EXCEP T THAT OF  
TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY  
AND FITNES S FOR A PARTICULAR P URP OS E ARE HEREBY DIS CLAIMED. LIMITATION OF  
LIABILITY: The rem edies of purchaser set forth herein are exclusive, and the total liability of  
OMEGA w it h re s p e c t t o t h is o rd e r, w h e t h e r b a s e d o n c o n t ra c t , w a rra n t y, n e g lig e n c e ,  
in d e m n ific a t io n , s t ric t lia b ilit y o r o t h e rw is e , s h a ll n o t e xc e e d t h e p u rc h a s e p ric e o f t h e  
c o m p o n e n t u p o n w h ic h lia b ilit y is b a s e d . In n o e ve n t s h a ll OMEGA b e lia b le fo r  
consequential, incidental or special dam ages.  
CONDITIONS: Equipm ent sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic  
Com ponent” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in m edical  
applications or used on hum ans. Should any Product(s) be used in or with any nuclear installation or  
activity, m edical application, used on hum ans, or m isused in any way, OMEGA assum es no responsibility  
as set forth in our basic WARRANTY / DISCLAIMER language, and, additionally, purchaser will indem nify  
OMEGA and hold OMEGA harm less from any liability or dam age whatsoever arising out of the use of the  
Product(s) in such a m anner.  
RETURN REQUES TS /INQUIRIES  
Direct all warranty and repair requests/inquiries to the OMEGA Custom er Service Departm ent. 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 num ber should then be m arked 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 inform ation available BEFORE  
contacting OMEGA:  
FOR NON-WARRANTY REPAIRS, consult OMEGA  
for current repair charges. Have the following  
inform ation available BEFORE contacting OMEGA:  
1. Purchase Order number under which the  
product was PURCHASED,  
2. Model and serial num ber of the product under  
warranty, and  
3. Repair instructions and/or specific problem s  
relative to the product.  
1. Purchase Order num ber to cover the COST of  
the repair,  
2. Model and serial num ber of the product, and  
3. Repair instructions and/or specific problem s  
relative to the product.  
OMEGA’s policy is to m ake running changes, not m odel changes, whenever an im provem ent is possible. This affords  
our custom ers the latest in technology and engineering.  
OMEGA is a registered tradem ark of OMEGA ENGINEERING, INC.  
© Copyright 2000 OMEGA ENGINEERING, INC. All rights reserved. This docum ent m ay not be copied, photocopied,  
reproduced, translated, or reduced to any electronic m edium or m achine-readable form , in whole or in part, without the  
prior written consent of OMEGA ENGINEERING, INC.  
page 19  
 
Where Do I Find Everything I Need for  
Process Measurement and Control?  
OMEGA…Of Course!  
Shop online at www.omega.com  
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