AW T4 20 |
U N I V ER S A L 4 - W I R E , D UA L- I N P U T T R A N SM I T T ER | O I/AW T4 2 0 - EN R E V. B
55
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 page 56.
N/A
Concentration Cal
See typical procedure, see page 56.
N/A
Resistivity Cal
See typical procedure, see page 56.
N/A
Temperature Cal
See Temperature Calibration procedure, see page 69.
N/A
Edit Cal
PV Slope
Edit the
PV Slope
value.
• Valid slope values range from 80 to 120 %
100 %
PV Offset
Edit the sensor
PV Offset
.
Valid offset values are:
• ±20 µS/cm for cell constants of 1.00
• ±4 µS/cm for cell constants of 0.10
• ±0.8 µS/cm for cell constants of 0.01
0 µS/cm
Temperature Slope
Edit the
Temperature Slope
value.
• Valid slope values range from 40 to 160 %
100 %
Temperature Offset
Edit the
Temperature Offset
value.
• Valid offset values are ±40 °C.
0 °C
Restore Cal Defaults
Resets slope and offset values to factory default.
N/A
Calibrate
Exit
Menu
Select
