Identifying Alarms - Dräger X-AM 2500 Technical Manual

For O concentrations under 8 vol. % an error is indicated
2
with » « at the ex-channel instead of the measuring
value as long as the measuring value falls below the pre-
warning threshold (only if measuring range is 100 %LEL,
not for >100 %LEL (heat conductance)).
In the event of an alarm, the corresponding displays,
including the visual, audible and vibration alarms,
are activated, see section 6 on page 21.
If the measuring range is exceeded significantly at the CatEx
channel (very high concentration of flammable materials),
a blocking alarm is triggered. This CatEx blocking alarm is
either acknowledged automatically through a functional
oxygen channel (e. g. a channel free of warnings and defects)
or manually by switching the instrument on and off in fresh air.
No blocking alarm is triggered in the "methane" configuration
setting when a measuring range is exceeded, because the
unambiguousness of the display for methane is ensured via
a separate measurement of the heat conductivity.
WARNING
!
After exposure to concentrations above 100 %LEL,
incorrect displays may occur at the CatEx channel.
Check the zero point and sensitivity and adjust it if
necessary before continuing to use the instrument in
a concentration range of 0 to 100 %LEL.
In the event of an impact load when using a CatEx
sensor in the Dräger X-am 2500 that causes the fresh
air display to deviate from zero, the zero point and
sensitivity must adjusted.
After the measuring range of the TOX measuring channels has
been exceeded temporarily (up to one hour), checking the
measuring channels is not necessary.
3.6

Identifying alarms

An alarm is displayed visually, audibly and through vibration in
a specific pattern.
3.6.1 Concentration pre-alarm A1
Intermittent alarm:
Display » A1 « and measured value alternating:
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.
Acknowledging the pre-alarm:
Press the key. Only the audible alarm and the vibration
OK
alarm are switched off.
3.6.2 Concentration main alarm A2
WARNING
!
Risk of fatal injury! Leave the area immediately. A main
alarm is self-latching and cannot be acknowledged or
cancelled.
Intermittent alarm:
Display » A2 and measured value alternating:
In case of A2, a double tone is audible and the alarm
LED flashes twice.
Dräger X-am 2500
After leaving the area, when the concentration has dropped
below the alarm threshold:
Press the key. The alarm messages are switched off.
OK
3.6.3 STEL / TWA exposure alarm
WARNING
!
Leave the area immediately. After this alarm,
the deployment of personnel is subject to the relevant
national regulations.
Intermittent alarm:
Display » A2 « and » « (STEL) or »
measured value alternating:
The STEL and TWA alarm cannot be acknowledged
or cancelled.
Switch off the instrument. The values for the exposure
evaluation are deleted after the instrument is switched
on again.
3.6.4 Battery pre-alarm
Intermittent alarm:
Flashing special symbol »
side of the display:
Acknowledging the pre-alarm:
Press the key. Only the audible alarm and the vibration
OK
alarm are switched off.
The battery still lasts min. 20 minutes after the first battery
pre-alarm.
3.6.5 Battery main alarm
Intermittent alarm:
Flashing special symbol »
of the display:
The battery main alarm cannot be acknowledged or cancelled:
The device automatically switches off after 10 seconds.
Before the instrument is switched off, the visual, audible
and vibration alarms are activated for a short time.
3.6.6 Instrument alarm
Intermittent alarm:
Special symbol » « displayed on the right
side of the display:
The instrument is not ready for operation.
For corrective measures, see"Replacing the sensors" on
page 21 to page 24.
Contact maintenance or Draeger Service to rectify
the problem.
« (TWA) and
« on the right
« on the right side
Use
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