GMI Oxygas 500, User Handbook Manual

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blockage and Button One should then be pressed to
restart the pump.
‘CHECK ZERO’
This indicates that there may have been a zero shift due to
the presence of gas. Switch off the instrument and switch on
again in fresh air.
‘ZERO FAULT’
This indicates that the zero is outwith its calibration limits.
Switch the instrument off and then on again in fresh air. If the
fault does not clear, return the instrument for servicing.
‘BAT’
This indicates that the batteries will soon require replacement.
At this point there will be approximately 60 minutes operation
left in a set of alkaline batteries, although this figure will vary
depending on battery manufacturer, temperature conditions,
usage etc. With rechargeable batteries the ‘BAT’ flag indicates
approximately 30 minutes operation left.
As the battery power continues to fall, the LCD flashes a
‘BAT FAULT’ message. Subsequently the LCD displays ‘OFF’
and the instrument automatically switches off. The batteries
should be replaced immediately.
‘BAT FAULT’
This indicates that the batteries require replacing.
‘1’
This message which can also appear after power on, indicates
that a calibration data error has been detected. The instrument
should be returned for servicing.
OPERATION