Measuring Function For The Explosion Protection Acc. To 94/9/Ec; Important Remark - Dräger PEX 3000 XTR 0000 Notice D'utilisation

Intended Use
The following conditions for safe use have to be observed:
1. Basically, the measuring principle of heat of reaction which is based on the cata-
lytic oxidation of a flammable gas, is ambiguous because at high gas concentra-
tions there is not enough oxygen in the sensor necessary for the oxidation
process. So the measuring signal decreases at high gas concentrations and even
can lead to measuring signal within the measuring range again. A connected
controller must be operated with alarm devices, outputs, and alarm thresholds
operating as latched if the measuring range is exceeded.
2. The measuring principle of heat of reaction needs a minimum oxygen concen-
tration of 12 % by vol., otherwise the measuring values will be too low because of
oxygen deficiency.

Measuring function for the explosion protection acc. to 94/9/EC

In the 1st supplement to the EC-type examination certificate TPS 04 ATEX 1 003 X
the transmitters PEX 3000, type XTR 00x and XTR 009x, with Ex-sensor PR M (part-
no. 68 09 225) have been approved in respect to the measuring function for explo-
sion protection acc. to EN 61779 part 1 and part 4, for the following gases and
vapours:
Methane, Propane, Acetone, Ammonia, Petrol 065/095 (FAM Standard Gasoline),
Benzene, 1,3-Butadiene, n-Butane, n-Butyl acetate, Cyclopropane, Diethyl ether,
Dimethyl ether, Ethanol, Ethene (Ethylene), Ethyl acetate, Ethylene oxide, n-Hexane,
Methanol, Methyl ethyl ketone (MEK), n-Nonane, n-Octane, n-Pentane, i-Propanol,
Propene (Propylene), Propylene oxide, Toluene, and Hydrogen.
Especially the PEX 3000 has undergone a safety related assessment concerning
the internal software and digital techniques, based on the harmonized standard
EN 50271.

Important remark

Although the transmitter has been factory-tested before delivery, the commissioning
after installation must include the zero- and span-adjustment.
The commissioning has to be terminated by a function test of the complete gas
detection system.
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9023810 - 2nd edition - September 2005