21
Identifying Alarms
Identifying Alarms
An alarm is displayed visually, audibly and through vibration in a specific pattern.
Concentration pre-alarm A1
The pre-alarm A1 is not self-latching and stops when the concentration has dropped
below the alarm setpoint A1.
In the case of A1 a single tone is audible and the alarm LED flashes.
Acknowledging the pre-alarm:
Press the key. Only the audible alarm and the vibration alarm are switched off.
Concentration main alarm A2
After leaving the area, if the concentration is less than the alarm setpoint A2:
Press the key. The alarm messages are switched off.
If the measuring range is exceeded significantly on the CatEx channel (very high
concentration of flammable materials), a blocking alarm is triggered. This CatEx
blocking alarm can be acknowledged manually by switching the device off and back on
again in fresh air.
In configuration setting CH
4
with measuring range 100 vol. %, no blocking alarm is
triggered as the heat conductance measurement principle is used.
NOTICE
At low temperatures the legibility of the display can be improved by switching on the
backlight.
The alarm is indicated by an intermittent alarm message:
Display »A1« and measured value alternating: not for O
2
!
The alarm is indicated by an intermittent alarm message:
Display »A2« and measured value alternating:
In the case of A2 a double tone is audible and the alarm LED flashes
twice.
For O
2
:»A1« and measured value alternating = oxygen deficiency
»A2« and measured value alternating = oxygen surplus
DANGER
Leave the area immediately. Danger to life! A main alarm is self-latching and cannot
be acknowledged or cancelled.
CAUTION
The measuring range 0 to 100 vol. % CH
4
is not suitable for monitoring explosive
mixtures in the measuring range from 0 to 100 %LEL.
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