Instructions pH FUN V1
Page 26 of 28
9.5
The pH7 calibration does not work
For the pH7 calibration, the pH FUN allows a maximum deviation of ±1pH which is compensated by the calibration. If
the calculated deviation is greater than ±1pH, there is a problem present. In this case, the pH FUN does not perform
the pH7 calibration.
The error message disappears again by pressing any button.
Cause
Remedy
The pH FUN shows
"Error! Calibration
invalid."
•
The pH electrode is defective
or too worn out. It no longer
supplies correct measured
values.
•
The pH7 buffer solution may
possibly be contaminated and
shows an incorrect pH value.
•
The correct sequence for the
pH7 calibration may not have
been adhered to precisely. The
pH measured value may
possibly have not yet
sufficiently stabilised in the
pH7 buffer solution
•
Please absolutely replace the pH electrode.
•
Use a new pH7 buffer solution and perform the
pH7 calibration again.
•
Perform the pH7 calibration again and proceed
step-by-step exactly as described in 6
Performing the pH7 calib.
9.6
The display of the pH FUN is dark
Cause
Remedy
The display of the pH
FUN is dark
The energy-saving mode is activated
(see 4.5).
Press any key to end the energy-saving mode of the pH
FUN.