18
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 a 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.
●
A latching alarm on the CatEx channel (due to the measuring range being significantly ex-
ceeded) cannot be acknowledged by the
key. The CatEx latching alarm is acknow-
ledged either automatically by a functioning (i.e. free of warnings and malfunctions) oxygen
channel or by manually switching the unit off and on again in fresh air.
STEL / TWA exposure alarm
— The STEL and TWA alarm cannot be acknowledged or cancelled.
●
Switch off the device. The values for the exposure evaluation are deleted after the device
is switched on again.
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 measurement value alternating = oxygen deficiency
» A2 «
and measurement value alternating = oxygen surplus
DANGER
Leave the area immediately. Danger to life! A main alarm is self-latching
and cannot be acknowledged or cancelled.
The alarm is indicated by an intermittent alarm message:
Display
» A2 «
and
»
«
or
»
«
and measured value alternating:
CAUTION
Leave the area immediately. After this alarm, the deployment of personnel
is subject to the relevant national regulations.
OK
OK
OK
