5.2 pH Calibration Notes
1. A 1-point calibration should be performed at least weekly. In applications
where the electrode junction can become blocked, such as dairy products,
mining slurries etc, a 1-point calibration may have to be done daily.
2. A full 2-point calibration should be performed at least monthly. Of course,
more frequent calibration will result in greater confidence in results.
3. All calibration information is retained in memory when the MC-81 is
switched off, even when the battery is removed.
4. The MC-81 displays the value of the pH buffer that it has attempted to
recognise at calibration. Ensure that the buffer value displayed corresponds to
the buffer that you are using.
5.3 pH Calibration Messages
1. If a 1-point calibration has been successfully performed, the MC-81 will
display the following message, and then display the asymmetry of the
electrode.
eg: 1 Point then: Asy
6.88 OK 0.10 pH
2. If a 1-point calibration has failed, the MC-81 will display the following
message, then the failed asymmetry value of the electrode.
eg: 1 Point then: Asy Hi or: Asy Lo
6.88Fail 1.50 pH -1.50 pH
3. If a 2-point calibration has been successfully performed, the MC-81 will
display the following message, and then the asymmetry and slope of the
electrode.
eg: 2 Point then: Asy then: Slope
4.00 OK 0.10 pH 95.0%
4. If a 2-point calibration has failed, the MC-81 will display the following
message, and then the failed slope value of the electrode.
eg: 2 Point then: Slope Hi or: Slope Lo then: Check
4.00Fail 130.0% 70.0% Buffers
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