Hygrometers are designed for continuous monitoring
An
Alpha Moisture Systems product story
Edited by the Engineeringtalk editorial team
Oct 6, 2005
The CMH Series is a range of chilled mirror dewpoint hygrometers, designed to give a primary measurement of water vapour content of gases.
The CMH Series is a range of chilled mirror dewpoint hygrometers, designed to give a primary measurement of water vapour content of gases.
These self contained dewpoint hygrometers combine the inherent accuracy, reliability and long term stability of optical chilled mirror technology with the convenience and ease of use of demanded by Industry.
The Model CMH dewpoint hygrometers are designed for continuous monitoring applications where high accuracy and reliability are required.
Dewpoint temperature measurement is made using a direct measuring sensor utilising a Peltier-cooled mirror, automatically held at the dewpoint temperature by a condensate detecting optical system, incorporating an LED light source and photodetector.
The optical sensing bridge detects the change in light level when dew or frost forms on the mirror.
Subsequent cycles of negative feedback controlled heating and cooling refine the result to a highly accurate constant reading of sample dewpoint.
This technique is a primary measurement of the water vapour content of the gas.The mirror temperature represents the true dewpoint temperature and is measured by an embedded precision platinum resistance thermometer.
For dewpoints below 0C, the instrument displays the frost point.
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