JUMO 202710 Operating Instructions Manual page 25

Error or Cause
system
message
The last calibration was invalid.
H
The old calibration data have
been retained.
Only for pH calibration:
The neutral buffer is not
permissible:
- combination electrode is faulty
- wrong buffer solution
- buffer solution is exhausted.
The slope is too flat:
- combination electrode is faulty
- buffer solution is exhausted.
mbar mbar
The slope is too steep:
- combination electrode is faulty
- buffer solution is exhausted.
mbar
mbar
Wrong calibration temperature
mbar
mbar
6 Error and system messages
Remedy
Repeat calibration.
To deactivate this warning: Press the CAL
key and keep pressed while the hand-held
meter is switched off and on again.
Clean the combination electrode.
Repeat calibration.
Replace the combination electrode.
Always use the neutral buffer as the first
solution.
Use fresh buffer solution.
Replace the combination electrode.
Use fresh buffer solution.
Replace the combination electrode.
Use fresh buffer solution.
Only carry out calibration in the range
0 to 60°C.
25