13
– All alarm setpoints A1 and A2 as well as
»
«
(TWA)
1)
and
»
«
(STEL)
1)
for H
2
S and CO are displayed in succession.
– During the running-in period of the sensors, the respective displays of the
measured value flash and the special symbol
»
«
(for warning) is displayed.
No alarms are issued during the warm-up period of the sensors. For details on
accelerated warm-up, see the Technical Manual.
Press the
[OK]
to cancel the display of the activation sequence.
Switching off the instrument
Press and hold the
[OK]
and
[ + ]
key simultaneously for approx. 3 seconds
until the countdown
» 3 . 2 . 1 «
shown on the display has elapsed.
– Before the instrument is switched off, the visual, audible and vibration alarms
are activated for a short time.
Before entering the workplace
Switch on the instrument. The current measured values are shown in the
display.
– Observe any warning
»
«
or fault messages
»
«
.
Check that the gas inlet opening on the instrument is not covered.
1) Only when activated in the instrument configuration. Delivery condition: not activated.
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.
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 silicum,
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.
The display of the CatEx sensor may be incorrect for measurements in a low-
oxygen atmosphere (<8 vol. % O
2
); this means that reliable measurement with
a CatEx sensor is no longer possible.
In an oxygen enriched atmosphere (>21 vol. % O
2
), the electrical operational
safety cannot be guaranteed; switch off the instrument or remove from the
working area.
During operation
– During operation, the measured values for every measured gas are displayed.
– If a measuring range is exceeded or a negative drift occurs, the following
displays are shown instead of the measured value display:
– Excess concentrations of flammable materials can lead to a lack of oxygen.
– For O
2
concentrations below 8 vol. % a fault is indicated for the Ex channel as
»
«
instead of the measurement, if the measurement is below the pre-
alarm threshold (not with setting CH
4
with measuring range >100 %LEL).
– In the event of an alarm, the corresponding displays, including the visual,
audible and vibration alarms, are activated – see Chapter “Identifying alarms”.
.
After the measuring range of the TOX measuring channels has been exceeded
temporarily (up to one hour), checking the measuring channels is not necessary.
»
«
(measuring range exceeded) or
»
«
(measuring range not reached) or
»
«
(blocking alarm).
WARNING
When using a CatEx sensor in the Dräger X-am 5000, a calibration of zero
point and sensitivity must be carried out after an impact load that results in
a fresh air display not equal to zero.
Summary of Contents for MQG 0010
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