PN 9000-280-VE, Rev B
Special Conditions for Safe Use
The WDG-V UOP is designed to be used in Category 3 hazardous locations where
explosive gases may be present. Protection against explosion is provided by purge
technique. There are four rules that must always be followed:
1. Do not open the enclosure unless the power is removed from both sensor and
control unit for 90 minutes while maintaining pressurization, or the area is demon-
strated to be non-hazardous.
2. Perform purge system maintenance as described in Chapter 2 of this manual.
3. Use only appropriate approved conduit fittings or cable glands for cable entry
(IIC, IP40 minimum). No holes shall be left unplugged.
4. Internal temperature rises above the rated T-class. The end user must take immedi-
ate action on the loss of pressure to reinstate purge.
HAZARDOUS LOCATION LIMITATIONS
The WDG-V UOP is a Category 3 analyzer specifically designed and certified for use
in ATEX II 3 G and IECEx hazardous locations. It can be safely operated in a location in
which:
• No gases are present with a higher probability of ignition than hydrogen (e.g.,
acetylene).
• The ambient temperature does not exceed 60 °C.
• Voltages are 104–127 VAC or 207–253 VAC, 740 VA.
Make sure the location in which the WDG-V is installed meets all of the Haz-
ardous Location Limitation criteria for a Category 3 analyzer described above.
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