Knauer K-7400S - Troubleshooting; System Error Messages; Troubleshooting Self-Freezing Sample

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Semi-Micro Osmometer K-7400S instructions, V3700
9. Troubleshooting
9.1 System messages
Any error message will be deleted simply by pressing any button. The
main screen will be displayed.
In any case the first row shows > ERROR < which is specified in the
second row.
Following messages can appear:
Error message Cause Remedy
FREEZE The crystallization took place
or an error occurred before the
active triggering of the freezing
process.
see “Self-freezing of the sample”
on page27
NO FREEZE No sample crystallization took
place after the activation of the
stir ring wire.
see “Non-freezing of the sample”
on page28
OUT OF RANGE The measured value is outside the
acceptable range.
Usually a malfunction of the
thermistor. Contact the Technical
Support.
NOT CALIBRATED No calibration points are
available.
See section „Measurement cali-
bration“ on page22
COOLER TIMEOUT Timeout due to too slow cooling:
>5 minutes from START
Contact the Technical Support.
MEASUREMENT
TIME OUT
Timeout due to too long measure-
ment: >5 minutes from START
Contact the Technical Support.
9.2 Self-freezing of the sample
If the sample does not super-cool but freezes spontaneously without initi-
ation, there are three possible causes:
If the following solutions do not solve the problem, the super-cooling
tem peratures are too low. The freezing temperatures in the device must
be set higher. The cooling temperature can be changed in screen 7
COOL (see „7.9 Important operating notes“ on page 24).