Dräger SE Ex HT M, Инструкция по эксплуатации, Страница: 46 / 60

Start-Up
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If the necessary voltage – or, at the central controller REGARD Ex – the necessary
span gas concentration cannot be adjusted:
●
Make sure that the proper span gas is used and that its concentration equals the
used value in %LEL.
●
Make sure that the span gas flows with the necessary flow of 0.5 L/min through
the calibration adapter.
If both these conditions are met, so the either the channel module is defective or the
sensing head's sensitivity to the span gas is not sufficient.
●
Replace sensor (see page 48) and/or channel module.
Following removal of span gas:
— Remove calibration adapter and close the span gas cylinder's valve.
— Sensing head in atmosphere free of combustible gases and vapours!
●
Indicator must return to 0 %LEL (0 mV at voltmeter), pay attention to exemption
from gas.
1 Press acknowledgement button.
If the indicator does not return to 0:
●
Repeat calibration / adjustment.
— If the indicator can no longer be set to the value corresponding to the span gas
concentration when performing calibration the Ex-sensor has to be replaced (see
page 48).
The adjustment work has to be performed for each channel module.
Finishing calibration procedure
Central Controller Polytron SE Ex:
●
If alarms had been inhibited: Remove wire jumper for alarm inhibition.
●
Fit front plate on rack.
Central Controller REGARD Ex:
●
By means of menu »00-2 SAVE« save the performed configuration.
Please refer to the Instructions for Use REGARD Ex.
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