pHotoFlex
®
Turb
Operation
47
ba75976e07
09/2021
4.6.2 Measuring the pH value
AutoRead
(drift control)
The AutoRead function (drift control) continually checks the stability of the
measurement signal. The stability has a considerable impact on the repro-
ducibility of measured values. The display of the measured parameter flash-
es until a stable measured value is available.
Criteria
With identical measurement conditions, the following applies:
4.6.3 Measuring the ORP
1 Perform the preparatory activities according to section 4.6.1.
2 Immerse the pH electrode in the test sample.
3 Press the
<M>
key (short pressure) repeatedly until the measured
parameter
pH
is selected.
pH & ORP
\
pH
6.94
25.0
°C
[AR]
01.02.05 15:12
Measured parameter
Reproducibility
Response time
pH value
Better than 0.01
> 30 seconds
ORP electrodes are not calibrated. However, you can check ORP
electrodes using a test solution.
1 Perform the preparatory activities according to section 4.6.1.
2 Immerse the ORP electrode in the test sample.
pH & ORP
\
ORP
157
mV
25.0
°C
[AR]
01.02.05 15:12
