Donaldson UDM 300, Руководство по эксплуатации

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6
The right measuring chamber
for each application:
Mounting recommendation
It is possible to mount the pressure
dewpoint meters directly in the airflow.
We generally, however, recommend the
use of a screw-on measuring chamber.
Standard measuring chamber for
compressed air up to 16 bar
Order no. 525218
Screw-on measuring chamber
Advantage: quick measurement, no time-
consuming installation
To enable accurate measurements in the low dew point range (–30...–80°C
td
), the
measuring temperature of the gas should, if possible, be that of room temperature
(20...35°C). With resin driers, for example, or other applications, the temperature of
the measuring gas is often higher, e.g. 80...120°C.
In this case we recommend installing a "cooling tunnel" of impermeable material in
front of the screw-on measuring chamber.
A Teflon pipe or a copper pipe would be ideally suitable for this purpose, as the hot
gas is cooled to ambient temperature over the length of the pipe, approx. 2 to 5 m.
Please do not use ordinary plastic tubes!
The dew point temperature in °C
td
does not change when cooled as it is an absolute
humidity value, which, like other measured variables e.g. g/m
3
, is independent of
temperature.
High pressure measuring
chamber up to 350 bar
Order no. 525219
INSTALLATION