7
INSTALLATION
In general humidity can be measured in all non-corrosive
active gases. For corrosive gases please query with
CS INSTRUMENTS GmbH.
To enable accurate measurements in the low dew point range (–30 to –80 °C
td
), the measuring
temperature of the gas should, if possible, be that of room temperature (20 to 35 °C). With resin
driers, for example, or other applications, the temperature of the measuring gas is often higher,
e.g. 70 ° to 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.
Druckluftleitung
FA 300
I N S T A L L A T I O N
FA 300-2 Ex
Compressed air pipe
Directly in the compressed air system
Screw in probe with G ½ " thread pressure-tight in the cen-
tre or in the compressed air pipe where the measurement is
to take place.Ensure that the measurement is carried out
close to the compressed air flow. U-bend pipes or non-flow-
ing compressed air result in very slow reaction times for the
moisture reading. Installation is recommended following dry-
ing of the compressed air and all bypass pipes or for critical
compressed air users.
I N S T A L L A T I O N
Measurable gases:
I N S T A L L A T I O N
Consideration:
When installing the instrument in areas
of gas group IIC ensure, that there are no sparks even
in uncommon hazardous incidents.