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10 Error and system messages
Error messages during measurement
Display
Cause
Battery voltage low,
the function can still be guaranteed only
for a short time.
Battery is used up
During mains operation: incorrect voltage Test power supply unit, replace if necessary
No display or
Battery voltage too low
muddled charac-
During mains operation: power supply
ters, device does
unit defective or incorrect voltage/polarity
not respond to
System error
keys being
pressed
Device error/device defect
Measuring range exceeded
Combination electrode is defective
Measuring range not reached
Combination electrode is defective
System error
Measuring range exceeded or not
reached by a significant margin
Preset calibration interval elapsed
Last calibration invalid
Error messages during calibration
Display
Cause
The neutral buffer is not admissible:
• Combination electrode is defective
• Wrong buffer solution
• Buffer solution used up
The slope is too low:
• Combination electrode is defective
• Buffer solution used up
The slope is too high:
• Combination electrode is defective
• Buffer solution used up
Wrong calibration temperature
48
Remedy
Insert new battery
Insert new battery
Insert new battery
Test power supply unit, replace if necessary
Remove battery or power supply unit, wait
briefly before reconnecting
Send in device for repair
Check if the measured value is above the admissi-
ble measuring range of the combination electrode
Send in device for repair
Check if the measured value is above the admissi-
ble measuring range of the combination electrode
Send in device for repair
Send in device for repair
Check whether the measured value is within
the admissible measuring range of the combi-
nation electrode
Calibrate device
Remedy
Clean combination electrode, recalibrate.
If error reoccurs: replace combination elec-
trode
Always use neutral buffer as first solution
(exception: 1 point calibration).
Use new buffer solution
Replace combination electrode
Use new buffer solution
Replace combination electrode
Use new buffer solution
Only
carry
out
0 and 60 °C
calibration
between
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