Vaisala DRYCAP DMT340 SERIES Guide de l'utilisateur télécharger pdf (Page 53)

Chapter 3 _______________________________________________________________ Installation

VAISALA _______________________________________________________________________ 53

An overpressure in the process is necessary to create a flow through the

sampling cell. Note that the pressure of the sampling cell must not differ

from that of the process because dewpoint temperature changes with

pressure. In dirty processes, it may be necessary to use a filter between

the cooling coil and the sampling cell. One more simple way of using the

sampling cell with user provided accessories is shown in the figure

below.The flow through the sampling cell is controlled with the needle

valve and the pressure is kept equal to that of the process.

0503-022

Figure 35 Installing the Probe in High Temperatures

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Vaisala DRYCAP DMT340 SERIES Guide de l'utilisateur Page 53