54
Maintenance
Note on the use in underground mining:
When calibrating the Ex channel to methane as the measured gas, the indication on
the instrument must be set to a value 5 % (relative) higher than the test gas
concentration used.
Automatic fresh air calibration in the charging cradle (CatEx sensor only):
Calibrate the gas detector to fresh air, free of measured gases or other interfering
gases. If the function is selected, a fresh air calibration of the CatEx sensor is
performed automatically as soon as the gas detector is inserted in the charging cradle.
This function can be selected or disabled using the CC-Vision PC software.
No calibration takes place if the warm-up is not yet complete:
Alarm LED is illuminated red.
The acoustic signal sounds twice followed by three short tones and the gas detector
switches off.
Once the fresh air calibration has been successfully completed:
Alarm LED is illuminated red.
The acoustic signal sounds once followed by three short tones and the gas detector
switches off.
If a fault has occurred during the fresh air calibration:
The fault message appears and is displayed for the respective sensor
instead of the measured value.
In this case, repeat the fresh air calibration.
If necessary, have the sensor replaced by qualified personnel.
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