Dräger HFG 000 Series Technical Manual page 9

Oxygen deficient atmospheres
Measurements in oxygen deficient atmospheres (<12 vol. % O
incorrect displays on the CatEx sensor. In this case the CatEx sensor cannot
provide a reliable measurement.
► Remove the device from the area.
The CatEx sensor in oxygen deficient or oxygen enriched environments
Incorrect measured values may be displayed in an oxygen deficient or oxygen
enriched environment.
► The CatEx sensor is intended to measure flammable gasses and vapours mixed
with air (i.e. O
am operational O
channel due to oxygen deficiency.
Incorrect calibration
CAUTION: An incorrect calibration leads to incorrect measured values.
► CSA requirement (Canadian Standard Association): The sensitivity must be
checked daily before first using the device with a known concentration of the gas
to be measured that corresponds to 25 to 50 % of the final concentration. The
accuracy must amount to 0 to +20 % of the actual value. The accuracy can be
corrected by calibration.
RFID tag (optional)
► The RFID tag must not be read out in explosion-hazard areas.
NOTICE
Damage to the CatEx sensor!
Fractions of catalytic poisons in the measuring gas (e.g. volatile silicon, 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,
replace the sensor.
DrägerSensor CatEx 125 PR (6812950) and CatEx 125 PR Gas (6813080)
► For this gas detector, only use sensors with serial numbers > ARLB XXXX
(starting with date of manufacture in February 2018). These sensors are certified
for use in zone 0, T4.
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Technical manual X-am® 3500/8000
content ≈ 21 vol. %). If the O
2
sensor is available, a channel error is triggered on the CatEx
2
Safety-related information
) may return
2
content falls below 12 vol. % and
2
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