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pHotoFlex
pH
Obviously incorrect
measured values
Measuring range
exceeded or undercut
Measured value display
(calibration error)
ba75977d04
11/2018
Cause
– Measurement disturbed by
external light
– Cell not correctly inserted
– Cell contaminated
– Cell shaft contaminated
– Dilution set incorrectly
– Selected program unsuitable
– Zero measurement incorrect
– Blank value incorrect
pH value / ORP voltage
Cause
Electrode:
– Air bubble in front of the
junction
– Air in the junction
– Gel electrolyte dried out
Test sample:
– The pH value lies outside the
measuring range
Cause
----
Electrode:
– Junction contaminated
– Membrane contaminated
– Moisture in the plug
Remedy
– Close the external light cover.
– Insert the cell so that it is
positioned on the bottom of
the cell shaft.
– Clean the cell
– Clean the cell shaft
– Set the dilution
– Select other program
– Perform zero measurement
– Remeasure the blank value
Remedy
– Remove air bubble
– Extract air or
moisten junction
– Replace electrode
– not possible
Remedy
– Clean junction
– Clean membrane
– Dry plug
Operation
19
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