Switching Off The Instrument; Before Entering The Workplace; During Operation - Dräger X-am 2500 Instructions For Use Manual

4.3

Switching off the instrument

Press and hold the OK-key and [+]-key at the same time until the
countdown 3 . 2 . 1 shown in the display has elapsed.
Before the instrument is switched off, the visual, audible and
vibration alarms are activated for a short time.
4.4

Before entering the workplace

WARNING
!
Check the display and, if necessary, calibrate the instrument
and check all alarm elements before carrying out safety
relevant measurements. A bump test must be performed
according to the national regulations.
1. Switch on the instrument. The current measured values are shown
in the display.
2. Observe any warning or fault
The instrument can be operated normally. If the warning message
does not disappear automatically during operation, the instrument
must be serviced after the end of use.
The instrument is not ready to measure and requires maintenance.
WARNING
!
Fractions of catalytic poisons in the measuring gas (e.g. volatile
silicium, sulphur, heavy metal compounds or halogenated
hydrocarbon) can damage the Cat Ex sensor. If the CatEx
sensor can no longer be calibrated to the target concentration,
the sensor must be replaced.
In case of measurements in oxygen-deficient atmosphere
(<8 vol. % O ) the CatEx sensor may show incorrect displays;
2
in this case, a reliable measurement with a CatEx sensor is
not possible.
Dräger X-am 2500
messages.
WARNING
!
In an oxygen enriched atmosphere (>21 vol. % O
the electrical operational safety cannot be guaranteed; switch
off instrument or leave work station.
3. Check that the gas inlet opening on the instrument is not covered.
4.5

During operation

During operation, the measured values for every measured gas
are displayed.
If a measuring range is exceeded or not reached, the following
displays are shown instead of the measured value display:
» « (measuring range exceeded) or
» «(measuring range not reached) or
» «(blocking alarm).
Excess concentrations of flammable materials can lead to a lack
of oxygen.
For O concentrations under 8 vol. % an error is indicated with
2
at the ex-channel instead of the measuring value as long as
the measuring value falls below the pre-warning threshold.
In the event of an alarm, the corresponding displays, including the
visual, audible and vibration alarms, are activated, see chapter 4.6
on page 20.
WARNING
!
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 be
adjusted.
Operation
),
2
19