DM70
The DM70 meter is suitable for direct
dewpoint measurements in the process
in a wide temperature and pressure
range. For more demanding
applications, the DM70 can be used
with the Vaisala sampling cell adapters,
or with the Vaisala DRYCAP® Sampling
System DSS70A.
DSS70A portable sampling
system
The DSS70A is designed to provide
dewpoint sampling flexibility. For
processes at atmospheric pressure, a
battery powered pump is used to
extract a gas sample. For pressurized
processes up to 20 bar, the sample is
measured at process pressure and then
reduced to atmospheric pressure for
venting or re-direction, bypassing the
pump. In all cases, the sample gas
passes through a filter to remove
particulate contamination before
measurement. Flow through the
system is controlled and monitored
with a needle valve and flow meter.
The DSS70A is easily connected to an
appropriate sample point with tubing
(typically 1/4" or 6 mm). The measured
dewpoint must be below ambient
temperature to avoid condensation in
the system. Gas temperatures higher
than +40 °C (+104 °F) should be cooled
with a short PTFE or stainless steel
tube prior to entering the DSS70A.
Sampling cells for pressurized
processes
The DM70 can easily be connected to
pressurized processes. In addition to
direct pipeline installation, a variety of
sampling cell options are available for
gas sampling.
The DMT242SC is a basic sampling cell
with only the main sampling cell body.
It has female threaded sample
connectors.
The DMT242SC2 is a sampling cell
supplied with welded Swagelok
connectors for sampling in a 1/4"
pipeline.
The DSC74 sampling cell has the
widest variety of connection adapters
to allow several different ways of
installation. The quick connector with
a leak screw allows a very fast
connection for compressed air lines.
Additionally, two thread adapters are
available for the outlet port.
The DSS70A provides a compact solution for
field checking dewpoint where direct
measurement is difficult. Typical applications
for the sampling system are metal treatment
and plastics drying processes.
The DSS70A sampling system includes a filter to clean the dirty
sample gas and a needle valve to control the sample flow rate with
the flow meter. A sample pump is used to generate a sample flow
from processes at ambient pressure.
DM70 Accessories:
DSS70A Sampling System and Sampling Cells
DSS70A flow chart
The sampling cells DMT242SC2 (left),
DMT242SC (middle) and DSC74 (right) can
be used to connect the DM70 to pressurized
processes.
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