Calibration Procedures; Turbidity Tss Calibration; 1-Point Calibration - ABB AWT420 Operating Instruction

72 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
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Calibration procedures

Turbidity TSS calibration

1-Point calibration

1 At the Calibrate level, press the
The Calibrate menu is displayed:
Calibrate
S1 : Turb TSS
S2 : Turb TSS
Hold Outputs
Back
2 Use the / keys to select the sensor to be calibrated,
and press the key to confirm selection.
The Turbidity Cal menu is displayed:
Calibrate
Sensor Verification
Turbidity Cal
TSS Cal
TSS Manual Cal
Sample Collection
Collection Complete
Back
3 Press the / keys to select Turbidity Cal and
press the key to confirm selection.
The Calibration Type is displayed:
Turbidity Cal
Calibration Type
1-Point
Next
key:
Select
Select
Edit
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.
The Offset setting is displayed:
Turbidity Cal
Offset
Remove Offset
Next
5 For most cases a zero offset is suitable. However, in
situations where an offset was previously determined during
a 2-point calibration, it is possible to retain the previously
measured offset during the 1-point calibration.
key to edit the Offset setting.
Use the
keys to select either Remove Offset or
Use the /
Retain Offset and press the
Press the and key to proceed to the next step.
The High Solution Value is displayed:
Turbidity Cal
High Solution Value
20000 NTU
Next
6 Use the
key to edit the solution value .
Use the / keys to set the value and press the
to confirm changes.
Press the and key to proceed to the next step.
Calibrate
Start Cal ?
2000 NTU
Abort
Edit
key to confirm changes.
Edit
Continue
key