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
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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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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 KΩ to 18.2 MΩ
II
2
( 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
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 Ω max. @ 12 V
325 Ω max. @ 18 V
600 Ω max. @ 24 V
•
Manufactured under ISO 9001 and ISO 14001
•
U.S.A. Patent # 5,708,363
page 3
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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 kΩ to 18 MΩ)
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
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Terminals 3 and 4: Loop Power
12-24 VDC ±10% system power
and current loop output.
Max. loop impedance:
50 Ω 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 Ω max. @ 18 V
600 Ω 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
15Ω
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
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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 Ω max. @ 12 V
13 is the isolated signal ground
14 is the sensor earth ground
325 Ω max. @ 18 V
600 Ω 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
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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
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
15Ω
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
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•
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
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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
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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, kΩ, MΩ, 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
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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
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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, kΩ, MΩ, 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
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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
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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, kΩ, MΩ, 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
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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
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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 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:
(BLACK)
Temp. IN
(WHITE)
TC resistor
Signal IN
(RED)
Simulation resistor
Sensor Cell
0.1 Cell
Resistance
=
e.g.
= 5,000 Ω or 5 KΩ
:
Desired conductivity (Siemens*)
0.000020 (Siemens*)
Sensor Cell
0.1 Cell
0.000001 Siemens*
Conductivity =
:
e.g.
=
Simulation resistance (Ω)
100,000 (Ω)
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 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.)
page 16
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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
kΩ or MΩ units 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 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 17
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page 18
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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
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Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA…Of Course!
Shop online at www.omega.com
TEMPERATURE
Ⅺ
ߜ Ⅺ
ߜ Ⅺ
ߜ Ⅺ
ߜ Ⅺ
ߜ Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies
Wire: Thermocouple, RTD & Thermistor
Calibrators & Ice Point References
Recorders, Controllers & Process Monitors
Infrared Pyrometers
PRESSURE, STRAIN AND FORCE
Ⅺ
ߜ Ⅺ
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ߜ Transducers & Strain Gages
Load Cells & Pressure Gages
Displacement Transducers
Instrumentation & Accessories
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Ⅺ
ߜ Ⅺ
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ߜ Ⅺ
ߜ Rotameters, Gas Mass Flowmeters & Flow Computers
Air Velocity Indicators
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Ⅺ
ߜ Ⅺ
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ߜ pH Electrodes, Testers & Accessories
Benchtop/ Laboratory Meters
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DATA ACQUISITION
Ⅺ
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Ⅺ
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MONITORING AND CONTROL
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6-8850.090-OM/ (C-8/ 02)
M3632/ 0802
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