18
The pre-alarm A1 is not latching and stops when the concentration has dropped
below the alarm threshold A1.
In case of A1, a single tone is audible and the alarm LED flashes.
In case of A2, a double tone is audible and the alarm LED flashes twice.
Acknowledge pre-alarm:
Press the
[OK]
key, only the audible alarm and the vibration alarm are
switched off.
Concentration main alarm A2
After leaving the area, when the concentration has dropped below the alarm
threshold:
Press the
[OK]
key, the alarm messages are switched off.
STEL / TWA exposure alarm
–
The STEL and TWA alarm cannot be acknowledged or cancelled.
Intermittent alarm:
Alternating display of
» A2 «
and measured value.
For O
2
:
A1
= lack of oxygen,
A2
= excess oxygen.
WARNING
Risk of fatal injury! Leave the area immediately.
A main alarm is self-retaining 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.
Intermittent alarm:
Display
»A2«
and
» «
(STEL) or
» «
(TWA) and measured value alternately:
WARNING
Health hazard! Leave the area immediately.
After this alarm, the deployment of personnel is subject to the relevant national
regulations.
NOTICE
The STEL alarm can be triggered with a maximum delay of one minute.
Switch off the instrument. The values for the exposure evaluation are
deleted after the instrument is switched on again.
Battery pre-alarm
Acknowledge pre-alarm:
Press the
[OK]
key, only the audible alarm and the vibration alarm are
switched off.
–
The battery still lasts approx. 20 minutes after the first battery pre-alarm.
Battery main alarm
The battery main alarm cannot be acknowledged or cancelled:
–
The instrument is automatically switched off again after 10 seconds.
–
Before the instrument is switched off, the visual, audible and vibration
alarms are activated for a short time.
Instrument alarm
–
The instrument is not ready for operation.
Commission maintenance personnel or the Dräger Service Centre to
eliminate the error.
Activating the Info mode
In measuring mode, press the
[OK]
key for approx. 3 seconds.
–
If any warning or fault messages exist, the corresponding note or error codes
are displayed (see Technical Handbook). Press the
[OK]
key successively
for the next display. The peak values and the exposure values TWA and
STEV will be displayed.
–
If no key is pressed for 10 seconds, the instrument returns automatically to
measuring mode.
Intermittent alarm:
Flashing special symbol
» «
on the right side of the display:
Intermittent alarm:
Flashing special symbol
» «
on the right side of the display:
Intermittent alarm:
Special symbol
» «
displayed on the right side of the display:
