SADP_Operating_ Instructions_0114
9.4 Temperature
Typical ambient variations experienced throughout the world are quite acceptable, but avoid
placing the instrument in direct sunlight or near a source of radiant or convected heat. In countries
that experience extremes of temperature, always carry out the Automatic Calibration with the
instrument at its operating temperature.
9.5 Pressure
The Automatic Dewpoint Meter operates with the sensor at atmospheric pressure, and the
readings given in Dewpoint temperature and parts per million are therefore correct at 1 bar (A).
However, Dewpoint temperature is directly proportional to pressure, and the results obtained from
the instrument can be referred to any other pressure by use of the pressure calculator, which is
supplied with the instrument. Instructions for the use of the calculator are printed on it.
9.6 Response Time
The response time of any water vapour pressure detector will naturally be very much quicker from
dry to wet, than from wet to dry. This is the reason that the Shaw Automatic Dewpoint Meter is so
successful. The sensor is kept in a dry condition when it is not in use, and therefore results are
obtained in the quickest possible time.
To check whether a particular instrument is within specification, carry out the Automatic Calibration
procedure, close the instrument head and note the reading 10 minutes later. If the unit has not
dried down to –40°C after this 10 minute period the instrument, should be returned to your local
dealer for examination.
9.7 Guarantee
All Shaw products are guaranteed conditionally for a period of two years from purchase, exceptions
being accidental damage, or damage caused by misuse or abuse. This period may be reduced to one
year if the instrument is purchased from the stock of one of our overseas dealers. A Guarantee
certificate is available by request.
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