Primary Measurement technique. Traceable to NPL/NIST.
Reduced maintenance requirements.
Easy to read, LED display
Programmable menu via front panel
Depression range of either 45 or 60║F - one or two stage cooling.
Two alarms (form C), automatic balance control, Scaleable analogue
outputs etc - all come as standard
Scan feature - view multiple parameters at 3s intervals
ABC: Automatic Balance Cycle
automatically corrects for most mirror contaminants
automatically re-standardizes instrument
maximizes length of unattended operation
The CMH Series is a range of chilled mirror
dew point hygrometers, designed to give a primary measurement of
water vapour content of gases. These self contained dew point 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. Typical applications include: Dewpoint temperature measurement is made using
a direct measuring sensor utilising a Peltier-cooled mirror, automatically
held at the dew point temperature by a condensate detecting optical
system, incorporating an LED light source and photo-detector. 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 dew point. This technique is a primary measurement
of the water vapour content of the gas.
The mirror temperature represents the true dew point temperature and is
measured by an embedded precision platinum resistance thermometer. For dew
points below 0°C, the instrument displays the frost point.
(For full details please request specification sheet Model CMH Series)