2-Point Automatic Calibration - ABB AWT420 Operating Instruction

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

2-Point automatic calibration

Note. Before starting the calibration ensure the pH buffers
are set to the correct values.
1 At the Calibrate level, press the
The Calibrate menu is displayed:
Calibrate
S1 : pH/Redox (ORP)
S2 : pH/Redox (ORP)
pH Buffers
Hold Outputs
Back
2 Use the
/ keys to select the sensor to be
calibrated, and press the
The pH calibration menu is displayed:
Calibrate
Sensor Cal
Temperature Cal
Edit Cal
Sample Collection
Collection Complete
Restore Cal Defaults
Back
3 Use the / keys to select sensor calibration and
press the key to confirm selection.
The calibration type is displayed:
Sensor Cal
Calibration Type
2-Pt Auto
Next
key:
Select
key to confirm selection.
Select
Edit
4 Use the key to edit the calibration type.
Use the / keys to select the required calibration
type and press the key to confirm selection.
Press the key to proceed to the next step.
Calibrate
Immerse in Buffer 1
ABB
4.0 pH
Abort
5 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
ABB
9.0 pH
Abort
Continue
Continue
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