AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | OI/AWT420-EN REV. B
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15 Calibration procedures
2-electrode conductivity
The conductivity/concentration/resistivity/temperature calibration is a smart one-point
calibration routine that allows for single- or dual-point calibrations. By initiating calibrations at
two different conductivity/concentration/resistivity/temperature values having ample
separation, the AWT420 transmitter automatically adjusts the offset, slope, or both in order to
obtain the best sensor performance. Since this routine only uses the most recent calibration
data, calibration can be conducted throughout the sensor’s life thus ensuring consistent sensor
performance. If an incorrect calibration has been entered, the Restore Cal Defaults menu
returns transmitter calibration values to factory settings.
The AWT420 transmitter can be configured as a Conductivity, Resistivity or Concentration
device, the smart one-point calibration routine automatically uses the same units as the
measured process variable.
Note. Access the calibrate menu via the Calibrate and Advanced levels only.
Menu Comment Default
Conductivity Cal See typical procedure, see . N/A
Concentration Cal See typical procedure, see . N/A
Resistivity Cal See typical procedure, see . N/A
Temperature Cal See Temperature Calibration procedure, see . N/A
Edit Cal
PV Slope Edit the PV Slope value.
•
PV Offset Edit the sensor PV Offset.
Valid offset values are:
•
•
•
Temperature Slope
Edit the Temperature Slope value.
•
Temperature Offset Edit the Temperature Offset value.
•
Restore Cal Defaults Resets slope and offset values to factory default. N/A
Calibrate
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