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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 >