Vaisala HMP230 Manuel d'utilisateur télécharger pdf (Page 25)

HMP230 SERIES

M210225en-B User's Guide

• STEP 3: push the probe head through the ball valve assembly into the

process. If the pressure is high, use a manual press tool. Note that the

sensor head must be pushed so deep that the filter is completely inside the

process flow.

VALVE OPEN

MANUAL

PRESS TOOL

VALVE CLOSED

FILTER

Figure 18 Installing the probe through the ball valve

assembly: step 3

For by-pass measurements, the probe is mounted behind the ball valve

assembly and non-leaking screw A on the fitting body is replaced with leaking

screw B and O-ring is placed on the groove of the sintered filter. Screw B has

a small (0.08 mm) laser-made hole in the middle; the gas or air to be measured

passes through the sintered filter and by the sensor, and leaks out through the

screw. The process pressure reduces in the hole of the screw B. This

installation is recommended if the process flow rate is >20 m/s and there is an

over-pressure in the process.

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Vaisala HMP230 Manuel d'utilisateur Page 25