Sartorius PB-11 - Electrode and Meter Testing; Electrode Test Procedures; Meter Operation Test

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4. To test the pH electrode, place it in a good
pH 7 buffer. Press pH/mV to use the mV
mode, and note the millivolt reading.
Repeat for either a pH 4 or pH 10 buffer.
The electrode signals must be within the
limits shown below (when temperature is
approx. 25°C).
5. To test the meter for correct operation, install
the BNC (input) shorting cap. Press pH/mV to
select the mV mode, and note the mV reading.
If the meter reads 0 ± 0.3 mV, it is measuring
correctly. Note that a long-term drift of
0.1 mV/month since last calibration is
specified.
Power
Ref
Input
ATC
Electrode Test
pH=7 0 ± 30 mV
pH=4 169 to 186 mV
more than pH 7
pH=10 159 to 185 mV
less than pH 7