Siemens SITRANS P Manual de usuario descargar pdf (Pagina 81)

UMSITRPDS3-1 Installation

November 2010

4-29

4.5.3 Electrical Conduit and Cable Installation

All electrical conduit and all signal wires must be supplied by the user. Access to electrical terminals is

described in Section 4.5.2.3.

For conduit and cable routing, refer to user’s installation drawings. Installation of conduit and cabling

should follow the guidelines given below.

4.5.3.1 Conduit

• Transmitter conduit inlets accept male conduit fittings. Refer to the transmitter’s rating plate and

Section 9.1 to determine whether conduit threads are 1/2-14 NPT or M20 x 1.5.

Seal NPT fittings with Teflon tape; seal M20 fittings with a soft-setting sealing compound rated for at

least 105°C (221°F).

• When routing conduit, avoid areas that might subject the conduit to chemical or physical abuse or

areas with high electromagnetic interference/radio frequency interference (EMI/RFI) conditions.

• Install conduit for field wiring.

• If a high humidity environment can exist and the transmitter is located at a low point in the conduit

run, install drain seals at the transmitter’s conduit inlets to prevent condensation from entering the

transmitter. See Figure 4-16.

• Remove all sharp edges or burrs from conduit that may damage wires; 18-inches of flex conduit is

recommended at each transmitter.

MG00354a

Conduit Drain

Explosion Proof

Drain seal in conduit coupling

Install conduit seal: Crouse-Hinds Type EYS or equivalent

Plug unused electrical entrance

Electrical conduit

FIGURE 4-16 Conduit Drain and Explosion Proof Installations

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 221 222

Sin comentarios

Siemens SITRANS P Manual de usuario Pagina 81