Vaisala DMP248, Operating Manual

Page: 14 / 141

OPERATING MANUAL _______________________________________________________________
10_____________________________________________________________________M210492
EN
-
A
NOTE
Be careful not to tighten the clasp nut more than 60
°
as this may
result in difficulties when trying to open it.
The probe is delivered with non-leaking screw A mounted. For by-
pass measurements, this screw is removed and replaced with leaking
screw B (included) and an O-ring is placed on the groove of the
sintered filter prior to installation. Make sure to tighten the screw
carefully.
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.
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).
recommended adjustment range
25...135 mm
non leaking screw
(screw A, factory setting)
welded sleeve (G1/2, Ø 40 mm)
process wall
Leave at least 25 mm (1 ")
of probe head free to enable
a faster response time in
unpressurized processes
25 mm
F
IGURE
3-5
Installing the probe in an atmospheric process.
If the probe is installed in process pipes where the water is likely to
collect at the measurement point, take care to install the sensor head
so that it will not be immersed in water.
When the probe is installed directly on the process wall or pipe, note
that a closing valve may be needed on both sides of the installed probe
so that the sensor head can be removed from the process for
calibration and maintenance.
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