16
Operation
During operation
During operation, the measured values for every measured gas are displayed.
In the event of an alarm, the corresponding displays, the visual, audible and vibration
alarms are activated – see chapter “Identifying Alarms”.
If a measuring range is exceeded or a negative drift occurs, the following displays
are shown instead of the measured value display:
If an O2 sensor is fitted and this sensor measures an O2 concentration of below
12 vol. %, an error is indicated with » « on the ex-channel instead of a
measured value if the measured value is below the pre-alarm threshold (not with the
setting CH4 with measuring range >100 %LEL).
After the measuring range of the TOX measuring channels has been exceeded
temporarily (up to one hour), checking the measuring channels is not necessary.
In the event of an alarm, the corresponding displays, including the visual, audible and
vibration alarms, are activated – see “Identifying Alarms” on page 21.
If the measuring range is exceeded significantly on the CatEx channel (very high
concentration of flammable materials), a blocking alarm is triggered. This CatEx
blocking alarm can be acknowledged manually by switching the device off and back on
again in fresh air.
In configuration setting CH
4
with measuring range 100 vol. %, no blocking alarm is
triggered as the heat conductance measurement principle is used.
»«(concentration too high) or
»«(measuring range not reached) or
»«
(blocking alarm).
NOTICE
Special states in which there is no measuring operation (quick menu, calibration
menu, warm-up of sensors, password input) are indicated by a visual signal (slow
flashing of the alarm LED ).
CAUTION
The measuring range 0 to 100 vol. % CH4 is not suitable for monitoring explosive
mixtures in the measuring range from 0 to 100%LEL.
WARNING
If the DrägerSensor CatEx 125 PR is used in the gas detector, a zero point and
sensitivity calibration must be carried out after experiencing an impact load that
results in a non-zero display when exposed to fresh air. This warning does not apply if
the DrägerSensor CatEx 125 PR Gas is used.
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