13
Operation
Before entering the workplace
● Switch on the device. The current measured values are shown in the display.
● Observe any warning » « or fault » « messages.
If one of these special symbols is displayed, appropriate measures, refer to page 22 to
page 24, must be taken.
● Check that the gas inlet opening on the device is not covered.
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:
» « (too high concentration) or
» « (negative drift).
In the event of an alarm, the corresponding displays, including the visual, audible and vibration
alarms are activated – refer to “Identifying Alarms” on page 18.
CAUTION:
Check and, if necessary, adjust the calibration before carrying out safety-relevant
measurements.
A function test with gas (bump test) must be carried out in accordance with local
regulations.
The device can be operated normally. If the warning message does not go out
automatically during operation, the device must be maintained after the end of
use.
The device is not ready to measure and requires maintenance.
CAUTION:
The presence of catalyst poisons in the measured gas (e.g.volatile silicone, sulphur, heavy
metal compounds or halogenated hydro-carbons) can damage the DrägerSensor CatEx
125. If the CAT Ex sensor cannot be calibrated to the target concentration anymore, the
sensor must be replaced.
The display of the Cat Ex sensor may be incorrect in an oxygen-poor atmosphere.
Electrical operating safety (Ex protection) is not guaranteed in an oxygen-enriched
atmosphere.
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