Siemens ET 77E Series Spezifikationen PDF herunterladen (Seite 22)

SD77

2.0 INSTALLATION

This section describes transducer installation for both hazardous and non-hazardous locations. Each E/P Transducer

nameplate shows the hazardous location classifications for which the transducer has been FM approved, Canadian

Standards Association certified or ATEX certified. All transducer installations should be in accordance with either

the current edition of the National Electrical Code (NEC), Canadian Electrical Code (CEC), or EN 60079-14, as

required by local regulations.

WARNING

Explosion can cause death or serious injury.

Failure to observe the following precautions could result in an

explosion hazard.

Installation in hazardous locations must be in

accordance with either the NEC, CEC, or EN 60079-14, as

required by local regulations.

The 77F models must be used in conjunction with energy limiting barriers. See drawing 15032-7704 or 15032-7705

in Section 8. See Section 1.3 Product Certifications for additional information.

A typical intrinsically safe system consists of one or more Model 77F transducers installed in a hazardous area, the

required quantity of appropriate energy limiting barriers installed in a non-hazardous location, and the needed

length of interconnecting twisted-pair cables.

For intrinsically safe installations in accordance with ATEX requirements, use barriers suitable for the parameters

marked on the nameplate.

2.1 MOUNTING

Figure 2-1 shows transducer dimensions, mounting hole locations, electrical access ports, and pneumatic

connections. Mount the transducer in an upright, vertical position. Tilting to 10° from vertical will not affect

operation

CAUTION

Mounting the transducer where the specified ambient temperature limits may be

exceeded can adversely affect performance and may cause damage.

A flat adapter plate is available for mounting the transducer to a blind wall. The adapter plate comes in a kit (PN

12330-100) with two 1/4-20 flat head screws for mounting the transducer to the plate. Two pairs of transducer

mounting holes are provided. Either pair can be used. See Figure 2-2 for adapter plate dimensions.

A 2" pipe mounting kit (PN 12334-130) is also available; see Figure 2-3. Use this kit to mount the transducer on a

2" O.D. pipe. It consists of a mounting bracket to mount the transducer and a U-bolt assembly for pipe mounting.

A transducer supplied for use in the European Union (and other locations requiring metric threads) will have a

housing with either an M20 conduit connection or a 1/2 NPT conduit connection and a 1/2 NPT to M20 adapter,

supplied for installation by the user. See Figure 2-4.

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