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pH 7
All values agree. Device is fine. Possible causes:
➢ Incorrect manual measurement
➢ Outdated buffer solution
The value in the measuring cell deviates. Possible causes:
➢ Hydraulics (flow, filter, fresh water, bacteria in the suction pipe etc.)
➢ Glass break of a sensor
➢ Electrical influence of measuring values/interference from other components
In the event of minor buffer solution deviations (e.g. pH 6.8 and pH 3.8), calibrate the
sensor.
6.2 Errors in Redox
[?] In the buffer solution Rx 475 mV, the electrode shows a value of <425 mV.
[1] Check the temperature dependency of the buffer solution.
30 °C = 480 mV
For a buffer solution temperature of 10 °C, the value 410mV is just about OK.
[2] Buffer solution too old (more than 1 year)
[3] Replace the Rx sensor if necessary.
475 mV
All values agree. Device is fine. Possible causes:
➢ Incorrect manual measurement
The value in the measuring cell deviates. Possible causes:
➢ Hydraulics (flow, filter, fresh water, bacteria in the suction pipe etc.)
➢ Glass break of a sensor
➢ Electrical influence of measuring values/interference from other components
pH 4
25 °C = 475 mV
Pool sample
20 °C = 470 mV
Pool sample
57
Measuring cell
15 °C = 465 mV
Measuring cell
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