Thermo Fisher Scientific Alpha pH 600 RF (In the process of updating the brand guideline & product image) - Manual (Page 30)

5.2 Electrode Offset Settings
NOTE: ‘Electrode Offset Setting’ is not available when the pH Transmitter is
configured for ORP measurement mode. (Refer Section 5.5 for
switching measurement modes)
In applications where continuous pH measurement is required, it may not be
convenient to remove the electrode for calibration. In such cases, an on-line offset
adjustment is recommended. The pH Transmitter allows you set an offset of up to
± 2.00pH to compensate for errors in the pH electrode.
The pH Transmitter adds or subtracts the offset value from the measured pH value
and displays the corrected value. However, if you need to offset the value beyond
the average offset you would expect in your application type, consider a full
calibration or even electrode replacement.
To Determine the Offset Value:
1. Take a sample from the liquid of pH measurement. Record the pH reading
of the pH transmitter at the time the sample was taken.
2. Measure the pH value of your sample using another calibrated pH meter
having its own electrode (pH tester, hand-held meter or bench meter)
3. The difference between these two readings is the offset
To Adjust the Offset Value:
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SETUP
ENT
ENT
1
pH
READY
pH
SETUP
2
pH
READY
pH
SETUP
3
11 From pH measurement mode press ENT key to enter setup mode as
described in section 5.1. The LCD shows the first screen of setup mode
(OFS). Press ENT key to access electrode offset setting (OFS).
2 The upper display shows the last configured offset value (if any), otherwise
zero. The lower display shows currently measured pH reading (including
last configured offset value). Allow the reading to stabilize. LCD shows