Measuring Function For The Explosion Protection Acc. To 94/9/Ec; Important Remark - Dräger PEX 3000 Gebrauchsanweisung

The following conditions for safe use have to be observed:
1. Basically, the measuring principle of heat of reaction which is based on the
catalytic oxidation of a flammable gas, is ambiguous because at high gas
concentrations 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
concentration of 12 % by vol., otherwise the measuring values may be too low
because of oxygen deficiency.
Measuring function for the explosion protection acc. to
94/9/EC
The transmitters PEX 3000, type XTR 00x and the remote version XTR 009x
combined with sensing head Polytron SE Ex PR ... DD have been approved in
respect to the measuring function for explosion protection acc. to EN 60079-29-1
for the following gases and vapours:
Acetone, acetylene, ammonia, benzene, 1.3-butadiene, n-butane, n-butyl acetate,
diethyl ether, dimethyl ether, ethanol, ethene (ethylene), ethyl acetate, ethylene
oxide, n-hexane, hydrogen, methane, methanol, methyl ethyl ketone (MEK), methyl
methacrylate, n-nonane, n-octane, n-pentane, petrol 065/095 (FAM standard
gasoline), propane, i-propanol, propene (propylene), propylene oxide, toluene and
o-xylene.

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.
Intended Use
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