19
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 threshold 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 threshold A2:
Press the key. The alarm messages are switched off.
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
WARNING
Danger to life! Leave the area immediately. A main alarm is self-
latching and cannot be acknowledged or cancelled.
WARNING
The measuring range 0 to 100 vol. % CH
4
is not suitable for monitoring explosive
mixtures in the measuring range of 0 to 100 %LEL.
OK
OK
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