ABB AWT210, Operating Instruction

Page: 45 / 54

AW T 210 |
2- W I R E CO N D U C T I V I T Y, P H/O R P, P I O N T R A N SM I T T ER | O I/AW T 2 10 - EN R E V. C 45
4-electrode conductivity sensor calibration
4-electrode conductivity may require wet calibration for the
greatest accuracy.
The procedure is for a manual calibration at a single reference
point.
Conductivity Calibration and Concentration Calibration
procedures are identical.
For Group A sensors
• If the calibration is performed at a conductivity value
<1 µS/cm the PV Offset is recalculated.
• If the calibration is performed at a conductivity value
≥1 µS/cm the PV Slope is recalculated.
For Group B sensors
• If the calibration is performed at a conductivity value
<5 µS/cm the PV Offset is recalculated.
• If the calibration is performed at a conductivity value
≥ 5µS/cm the PV Slope is recalculated.
1 Wait for stable reading
– – – –
PV 752 uS/cm
Continue When Stable
Conductivity Cal
Abort
Continue
Monitor the process value and
continue ( ) to the next step once
the value has stabilized.
2 Enter the new value
– – – –
PV 752 uS/cm
New
0 752
Conductivity Cal
Next
Continue
Enter the desired PV value by
pressing the key to move the
cursor and the
keys to
change the value. When the new
value has been entered press the
key to continue.
3 Completion
Following a successful calibration
the calculated coefficients are
displayed.
Following an unsuccessful
calibration the reason for failure
is displayed.
Toroidal conductivity sensor calibration
Toroidal conductivity may require wet calibration for the
greatest accuracy.
PV Zero calibration
1
Apply zero and wait for
stable reading
– – – –
PV 1.2 uS/cm
Continue When Stable
PV Zero Cal
Abort
Continue
Ensure that a zero solution is
present at the sensor, monitor the
process value and continue ( ) to
the next step once the value has
stabilized.
2 Sampling
The procedure moves automatically
to the next stage once the PV has
been sampled.
3 Completion
Following a successful calibration
the calculated coefficients are
displayed.
Following an unsuccessful
calibration the reason for failure
is displayed.
– – – –
Conductivity Cal
Exit
PV 750 uS/cm
PV Slope 99.69%
PV Offset 0.00 uS...
– – – –
Conductivity Cal
Exit
PV 752 uS/cm
Calibration Failed
Offset Too High
– – – – –
PV 1.2 uS/cm
PV Zero Cal
Abort
– – – –
PV Zero Cal
Exit
PV 0.0 uS/cm
PV Slope 100.0%
PV Offset –1.2 uS...
– – – –
PV Zero Cal
Exit
PV 1.2 uS/cm
Calibration Failed
Offset Too High