ABB AWT420 Operating Instruction page 63

AW T4 2 0 | U N I V E R S A L 4 - W I R E , D U A L- I N P U T T R A N S M I T T E R | O I/A W T4 2 0 - E N R E V. B
6 Use the
key to edit the low buffer value.
Use the / keys to set the value and press
the key to confirm changes.
Press the key to proceed to the next step.
The second buffer value is displayed:
Sensor Cal
High Buffer Value
9.0 pH
Next
7 Use the
key to edit the high buffer value.
Use the / keys to set the value and press
the key to confirm changes.
Press the key to proceed to the low buffer
calibration:
Calibrate
Immerse in Buffer 1
4.0 pH
Abort
1 2 3
Edit
Continue
8 Place the sensor into buffer 1 and press the
key to perform the low buffer calibration. The
calibration process screen is displayed:
Calibrate
pH 4.00 pH
Tmp 25.0 °C
Settling-Please Wait
Abort
• If the calibration fails the result screen is displayed
with the reason for failure.
• If the calibration passes the procedure moves
automatically to the high buffer calibration.
Calibrate
Immerse in Buffer 2
9.0 pH
Abort
9 Place the sensor into buffer 2 and press the
key to perform the high buffer calibration. The
calibration process screen is displayed:
Calibrate
pH 9.00 pH
Tmp 25.0 °C
Settling-Please Wait
Abort
On completion the result screen is displayed.
• If the calibration passes the slope and offset values
are displayed.
• If the calibration fails, the failure reason is displayed.
Note. The calibration can be canceled at any time during
the process by pressing the Abort
Continue
key.
63