Vaisala DMT152 - Manual (Page 27)

Chapter 4 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 25
DSC74 Sampling Cell with Quick
Connector and Leak Screw
The DSC74 has been designed especially for compressed air lines. The
sampling cell contains an adjustable leak screw that allows keeping up
the pipeline pressure at the sensor. The leak screw is opened and closed
with a screwdriver. The leak screw should be 1/2 turn open. This can be
verified by first closing the leak screw, then turning 1/2 turn to open it.
Then the air coming out will make a barely audible little hiss and it can
be lightly felt when putting a hand in front of the air stream.
NOTE Do not open the leak screw more than 1/2 turn to avoid reducing the
pressure in the sampling cell.
The DSC74 comes with a quick connector that fits to industry standard
compressed air line connectors (suitable for type D, Quick08, NIP08).
This allows for easy installation and detachment of the dewpoint
transmitter without having to shut down the process. Alternative ways to
connect are through the two different thread adapters (G3/8" to G1/2"
and G3/8" to G1/4" ISO) that are supplied with each DSC74 unit.
When using the DSC74, seal the threads of the quick connector or thread
adapter carefully with PTFE thread seal tape. Tighten with an open-end
wrench.
0507-105
Figure 13 DSC74 Sampling Cell with Accessories
1 = Thread adapter type G3/8" - G1/2"
2 = Thread adapter type G3/8" - G1/4"
3 = Quick connector
4 = Leak screw
5 = Sampling cell body (DMT242SC)