2-Point Calibration - ABB AWT420 Operating Instruction

82 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
...15 Calibration procedures
...Dissolved oxygen calibration

2-Point calibration

1 At the Calibrate level, press the
The Calibrate menu is displayed:
Calibrate
S1 : RDO
S2 : RDO
Hold Outputs
Back
2 Use the / keys to select the sensor to be calibrated,
and press the key to confirm selection.
The RDO calibration menu is displayed:
Calibrate
Sensor Calibration
Back
3 Press the key to confirm selection.
The Calibration Type is displayed:
Sensor Calibration
Calibration Type
2-Point
Next
4 Use the key to edit the Calibration Type .
keys to select the required Calibration Type
Use the /
and press the key to confirm selection.
Press the and key to proceed to the next step.
Calibrate
Start Span Cal?
Place in 100% Sat
Abort
key:
Select
Select
Edit
Continue
5 Ensure the sensor is subjected to 100 % saturation and
press the key to start the calibration process.
The calibration process screen is displayed:
Calibrate
PV 98.26 %
TMP 24.22 °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
Start Zero Cal?
Place in 0% Sat
Abort
6 Ensure the sensor is subjected to 0 % saturation and
press the key to start the calibration process.
The calibration process screen is displayed:
Calibrate
PV 2.06 %
TMP 24.84 °C
Settling - Please Wait
Abort
On completion the result screen is displayed.
• If the calibration passes the new settings are displayed.
• If the calibration fails the reason for failure is displayed.
Note. The calibration can be canceled at any time during the
process by pressing the Abort key (
Continue
).