Vaisala DMP248 Service Manual download pdf (Page 15)

CHAPTER 3_______________________________________________________________INSTALLATION

VAISALA __________________________________________________________________________ 9

NOTE

Take care not to damage the pipe of the probe. If the pipe is damaged,

the probe head is less tight and it will not go through the clasp nut.

Mounting; overview

>10.5mm

fitting body

hex = 24mm

tapered thread

R1/2 ISO 7/1

ø19mm drilling

sealing with:

1. LOCTITE® No 542 + activ. No 7649 (t=-55...+150 °C)

2. MEGA-PIPE EXTRA No 7188 (t=-55...+170 °C)

3. PTFE tape (t=-60...+210 °C) NOTE: the tape does not lock

the parts together. Therefore, use two fork spanners (hex 24 and

27 mm) for tightening and opening the clasp nut of the probe

parallel thread

G1/2 ISO 228/1

(BS 2779, JIS B0202)

>40mm

Process or pipe wall

FIGURE 3-3 Sealing and thread cutting for the fitting body.

The fitting body can be installed e.g. on standard pipe fittings (G 1/2

ISO 228/1) or on a thread in the process wall. If the wall thickness is

less than 10.5 mm, it is recommended to use a welded sleeve (see

FIGURE 3-3). Note that the minimum recommended distance of the

fitting body and probe head is 40 mm (see FIGURE 3-3).

Adjust the probe to a suitable distance according to the type of

installation, and tighten the clasp nut first manually. Then, mark the

fitting body and the clasp nut and tighten the nut a further 50...60°

with a fork spanner (see FIGURE 3-4).

60°

probe

fitting body

clasp nut

max.

a pen

FIGURE 3-4 Tightening the clasp nut.

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Vaisala DMP248 Service Manual Page 15