Siemens SITRANS P Manual do Utilizador descarregar pdf (Página 76)

Installation UMSITRPDS3-1

November 2010

4-24

Models 7MF4333, 7MF4433, and 7MF4533

920-07012-XXX-1.pdf

FIGURE 4-13 Differential Construction, Position Options

4.4.2 Direct Mounting to Process, Model 7MF4433 or 7MF4533

A differential transmitter can be interfaced to the process through a

two- or three-valve manifold and supported by the piping

connections (3-inch nipples) if mounted directly at the point of

measurement.

Transmitter process connections are on 2.13-inch (54 mm) centers

to allow direct mounting (bolting) to a manifold with the same

spacing. Each transmitter process connection (end cap) has two

tapped 7/16-20 mounting holes and a 1/4 NPT tapped pressure

inlet. High pressure (+) and low pressure (-) sides of the transmitter

are marked by labels (see Figure 4-12) and engraved on the capsule

between the end caps.

Process orifice flanges with standard 2.13-inch spacing permit a transmitter and two- or three-valve

manifold combination to be direct mounted.

The procedure for mounting a transmitter to a two- or three-valve manifold, and the manifold to the

orifice flanges, is covered by the installation instructions supplied by the manifold manufacturer.

The following is a guide and may need to be modified for some installations. Teflon

tape is the

recommended thread sealant for process connections at the transmitter.

1. If installed, remove process connection blocks from the transmitter’s end caps (process manifold).

2. Press the supplied O-ring seals into the grooves in the face of the two- or three-valve manifold and

bolt the transmitter end caps to the transmitter side of the two- or three-valve manifold. Tighten

mounting bolts to 400 in/lbs (45.2 Nm).

MG00352b

Nipple Mount for

Liquid Service

3-Valve

Manifold

High

Pressure

Side

Low

Pressure

Side

Flow

Orifice

Flanges

End Cap

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 221 222

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