Error And System Messages - JUMO 202710/30 Operating Manual

9 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 Battery voltage too low
or muddled char-
During mains operation: power supply
acters, device
unit defective or incorrect voltage/polarity
does not respond
System error
to keys being
pressed
Device error/device defect
Measuring range exceeded
Measuring cell is defective
Measuring range not reached
Measuring cell is defective
System error
Measuring range exceeded or not
reached by a significant margin
Display value cannot be calculated,
measuring range or input value
exceeded
Display value cannot be calculated,
measured values too unstable
Preset calibration interval elapsed
Last calibration invalid
Error message during automatic alignment
Display Cause
Relative cell constant too large
Relative cell constant too small
Solution in incorrect range
Incorrect temperature
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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 whether the measured value is above the
permissible measuring range of the sensor
Send in device for repair
Check whether the measured value is below the
permissible measuring range of the sensor
Send in device for repair
Send in device for repair
Check whether the measured value is within the
permissible measuring range of the sensor
Check measuring range
Wait for signal control of the device
Calibrate device
Remedy
Determined relative cell constant
must not be > 1.2
Determined relative cell constant
must not be < 0.8
Incorrect reference solution, way beyond
the tolerance
Reference solution outside the permissible tem-
perature (0.0 to 34.0°C, or 0.0 to 27.0°C with
reference solution 111.8 mS/cm)