Dräger PEX 3000 Manual Del Usuario página 28

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Control
WARNING
In dust explosion-hazard areas (zones 21 and 22) there is no dust explosion
protection if the housing cover is opened in a live state. The Ex area has to be
temporarily de-classified, if necessary! Appropriate precautions must be made.
Before closing the cover, ensure that the transmitter is free of dust.
Only certified sensors or certified remote sensing heads are allowed to be
connected to the transmitter's br/br, ge/yw and sw/bk connection terminals.
Observe the following instructions for the measuring function:
1. The heat of reaction measuring principle, which is based on the catalytic
oxidation of a combustible gas, is essentially ambiguous because, at high
measuring gas concentrations, there is not enough oxygen in the sensor to
oxidise the combustible gas. As a result, the measured signal decreases at
high gas concentrations and can lead to values within the measuring range.
A connected controller unit must be operated with display devices,
measured value outputs (if available), and alarm thresholds operating self-
retaining if the measuring range is exceeded.
2. The heat of reaction measuring principle requires a minimum oxygen
concentration of 12 vol%, otherwise the displayed measured values will be
too low because of oxygen deficiency.
3.4 Measuring function for explosion protection
in acc. with 2014/34/EU and SI 2016/1107.
The PEX 3000 transmitter type XTR 000x and remote versions XTR 009x in
combination with the sensing head Polytron SE Ex ... DQ have been approved
in respect to the measuring function for explosion protection in acc. with EN
60079-29-1 for the following gases and vapours: acetone, acetylene, ammonia,
petrol 065/095 (FAM regular petrol), benzene, 1.3-butadiene, n-butane, n-butyl
acetate, diethyl ether, dimethyl ether, acetic acid, ethanol, ethene (ethylene),
ethyl acetate, ethylene oxide, n-hexane, methane, methanol, methyl ethyl
ketone (MEK), methyl methacrylate, n-nonane, n-octane, n-pentane, propane, i-
propanol, propene (propylene), propylene oxide, toluene, hydrogen and o-
xylene.
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The PEX 3000 transmitter type XTR 001x and remote versions XTR 009x in
combination with the sensing head Polytron SE Ex LC ... DD have been
approved in respect to the measuring function for explosion protection in acc.
with EN 60079-29-1 for the following gases and vapours: methane, propane,
acetylene, benzene, i-butene, ethene, n-nonane, propene and hydrogen.
4 Control
4.1 Operate menu
The transmitter features a two-digit 7-segment display and two scroll keys (key
▲ and key ▼) to navigate through the described menus. Pressing both scroll
keys simultaneously equals pressing an OK button, indicated as "keys ( +▼)"
in the following. The ▼ key is also marked with an M to indicate that you can
press this key to go from measuring mode to the calibration menu or the
maintenance menu. Both these menus can only be exited using the ▲ key.
Display and scroll keys are accessible after opening the housing.
WARNING
Dust explosion protection is not ensured after having opened the transmitter's
housing. The Ex area has to be temporarily de-classified, if necessary!
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