Vaisala DMT340 - Manual (Page 37)

Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 35
Probe Mounting
NOTE Some probe and filter combinations are equipped with a washer under the
filter. When mounting a probe inside a sampling cell, you may have to
remove the washer to make the probe fit.
NOTE When measuring temperature dependent quantities make sure that the
temperature at the measurement point is equal to that of the process,
otherwise the moisture reading may be incorrect.
DMT342 Small-size Flanged Probe for
Use with Sampling Cell
The DMT342 probe is a small pressure-tight probe equipped with
installation flange. When sampling in pressurized processes, the
sampling cell HMP302SC is available as an optional accessory. It may be
necessary to use the sampling cell if the process (for example a pipe) is
too small for the DMT342 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.
0503-018
Figure 19 DMT342 Installation (without the Sampling Cell)