UMSITRPDS3-1 Installation
November 2005
4-33
4.7 HAZARDOUS AREA INSTALLATION
Drawings providing transmitter installation data for hazardous areas are located in Appendix B Hazardous
Area Installation. Entity parameters, barrier selection, and important wiring information are specified on
these drawings. The appendix also contains a list of tested barriers.
WARNING
Explosion can cause death or serious injury.
In a Division 1 area, where an explosion-proof rating is
required, remove power from the transmitter before removing
either enclosure cap. When replacing an enclosure cap, it
must be screwed onto the enclosure until the O-ring is
sufficiently compressed to prevent leakage into the
enclosure. Cap locks may be required.
All pertinent regulations regarding installation in a hazardous
area must be observed.
Before installing a transmitter in a hazardous area, check the rating and approval plates on the transmitter
and Section 9 Model Designation and Specifications for required approvals or certifications.
Explosion-Proof Installation
If the installation is required to be explosion-proof as defined by the National Electrical Code, refer to a
current copy of the Code and the following:
• User-supplied explosion-proof conduit seals (glands) are required on transmitter housing conduit
outlets and any installed junction boxes. See Figure 4-16.
• Explosion-proof glands must provide a good seal. Apply a sealing compound around the sealing
surface if necessary.
• Power wiring conduit entries at the transmitter must have a minimum of five threads fully engaged.
• The enclosure cap must be installed and have a minimum of eight threads fully engaged with no
damaged threads permitted.
• Go to Section 4.6 for wiring connections to the transmitter’s terminals. Refer to Appendix B for
hazardous area installation.
This completes the physical installation.
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