Vaisala HMP228 Guia do Utilizador descarregar pdf (Página 14)

User's Guide _______________________________________________________________________

12 ____________________________________________________________________M210498en-A

When the probe is used in a pressurized processes the sensor head should

preferebly be installed through a ball valve assembly.

Sealing thread cutting for the fitting body.

>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

CAUTION

In pressurized processed it is essential to tighten the supporting nuts

and screws very carefully to prevent loosening of the probe by the

action of pressure.

CAUTION

Take care not to damage the probe body. A damaged body makes

the probe head less tight and may prevent it from going through the

clasp nut.

Ball valve installation

The ball valve installation is preferred when connecting the probe to a

pressurized process or pipeline. Use the Vaisala DMP248BVS ball valve

set or a 1/2" ball valve assembly with a ball hole of ∅14 mm or more. If

you install the sensor head (∅ 12 mm) in a process pipe, please note that

the nominal size of the pipe must be at least 1 inch (2.54 cm). Use the

manual press tool to press the sensor head into the pressurized (< 10 bar)

process or pipeline.

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Vaisala HMP228 Guia do Utilizador Página 14