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 23 to
●
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).
— If the concentrations of combustible materials are too high, this may result in a lack
of oxygen.
— If the O
2
concentrations are under 8 vol. %, a fault with »
« is displayed for the
Ex channel instead of the measured value, if the measurement is below the pre-alarm
threshold.
In the event of an alarm, the corresponding displays, including the visual, audible and vibra-
tion alarms are activated – refer to “Identifying Alarms” on page 18.
When the measuring range on the CatEx channel is significantly exceeded (very high concen-
tration of flammable substances), a latching alarm is triggered. This CatEx latching alarm is
acknowledged either automatically by a functioning (i.e. free of warnings and malfunctions)
oxygen channel or by manually switching the unit off and on again in fresh air.
After the measuring range of the TOX measuring channels has been exceeded temporarily
(up to one hour), checking the measuring channels is not necessary.
When using a CatEx sensor in the Dräger X-am 2000, the zero point and sensitivity must be
adjusted after any extreme impact loading.
CAUTION
Check and, if necessary, adjust the calibration before carrying out safety-relevant measure-
ments. 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 auto-
matically during operation, the device must be maintained after the end of use.
The device is not ready to measure and requires maintenance.
WARNING
The presence of catalyst poisons in the measured gas (e.g., volatile silicone, sulfur, heavy
metal compounds or halogenated hydrocarbons) can damage the DrägerSensor CatEx
125 PR. If the sensor cannot be calibrated to the target concentration anymore, the sensor
must be replaced. The display of the CatEx 125 PR sensor may be incorrect in an oxygen-
poor atmosphere. Electrical operating safety (Ex protection) is not guaranteed in an oxygen-
enriched atmosphere. Danger of explosion!
WARNING
After exposition to concentrations above 100 %LEL, the indication displayed at the CatEx
channel may be incorrect. Before any further use of the device within the concentration
range from 0 to 100 %LEL, check and, if necessary, adjust the zero point and the sensitivity.