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
57
4-electrode conductivity
The conductivity/concentration/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/temperature values having ample separation, the
AWT420 transmitter automatically adjusts the offset, slope, or both to obtain the best sensor
performance.
Because this routine uses only the most recent calibration data, calibration can be conducted
throughout the sensor’s life thus ensuring consistent sensor performance. If an incorrect
calibration is entered, the
Restore Cal Defaults
option returns the transmitter calibration values
to factory settings.
The AWT420 transmitter can be configured as a conductivity or concentration device, the smart
one-point calibration routine automatically uses the same units as the measured process
variable.
Note
. Access to the
Calibrate
menu is via
Calibrate
and
Advanced
levels only.
Menu
Comment
Default
Conductivity Cal
See typical procedure, see page 58.
N/A
Concentration Cal
See typical procedure, see page 58.
N/A
Resistivity Cal
See typical procedure, see page 58.
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
