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UMSITRPDS3-1 Installation

November 2010

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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