Installation ________________________________________________________________________
Vaisala _________________________________________________________________________ 19
The HMP368 probe for measuring
humidity in pressurized pipelines
or moisture in liquids
The HMP368 probe is available with two lengths, standard 178 mm
and optional 400 mm. The probe is provided with a sliding fit which
enables different installation depths and makes the installation and
removal easier in pressurized processes. The probe is specially
designed for the measurements in pipelines. This probe is also
available for dewpoint measurements in natural gas.
When the probe is used in a pressurized pipeline or in liquids (e.g.
feeder routes) the sensor head should preferably be installed directly
in the process through a ball valve assembly, see page 20.
CAUTION
In pressurized processed it is essential to tighten the supporting nuts
and screws very carefully to prevent loosening of the probe by the
action of pressure.
NOTE
•
When the HMP368 is installed in a process with a pressure
differing from normal atmospheric pressure, please enter the
pressure value of the process (in hPa or mbar) into the
transmitter memory via the serial line (see page 42) or via the
display/keypad (see page 33).
•
Make sure that the temperature at the measurement point is equal
to that of the process, otherwise the humidity reading may be
incorrect.
