Vaisala DMT340 User Manual download pdf (Page 49)

Chapter 3 ________________________________________________________________ Installation

VAISALA ________________________________________________________________________ 47

Mounting the Probe Directly to the

Process

Select a point, which gives a true picture of the process. The transmitter

can be installed directly in the process wall, especially if the pressure of

the process is 1 bar (atmospheric processes).

It may be necessary to use the sampling cell if the process (for example a

pipe) is too small for the DMT348 probe. Furthermore, if the process is

very hot (>80 °C) or particularly dirty, the probe is installed in a

sampling cell behind a cooling coil and/or filter. In this case, the ambient

temperature must be at least 10 °C warmer than the process dewpoint in

order to avoid condensation in the sample tubing.

0503-016

Figure 32 DM240FA with Probe

The numbers refer to Figure 32 above:

measured gas

probe

DM240FA flange (thread G1/2" ISO)

use R1/2" ISO fitting body for DMT348 probe with DM240FA

flange

recommended additional hole (plugged) for Td field check

reference measurement probe (for example, Vaisala DM70)

If the probe is installed in process pipes where the water is likely to

collect at the measurement point, take care to install the probe so that it

will not be immersed in water.

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Vaisala DMT340 User Manual Page 49