European Facility For Airborne Research

Thermoelectric Chilled Mirror Hygrometer
Operating principle information should be extended to explain servo-control of mirror temperature and detection of condensation deposit.
Note possible ambiguity between dew and frost-point temperatures for low mirror temperatures.
Operating principle is extended to include cryogenic cooling in addition to thermoelectric.
or
manual hygrometers

Approximate dimensions, inches and (cm)
Main unit: 10" (25 cm) w x 10.75" (27 cm) d x 3.75" (9.5 cm) h
Display module: 8" (20 cm) w x 8" (20 cm) d x 5" (13 cm) h
Rack mounting optional
Approximate Weight (excluding cable and heat sink)
Main unit: 7 lbs (3.2 kg) (heat sink adds 3 lbs (1.4 kg))
Display module: 3.25 lbs (1.5 kg)

Certified for operation on FAAM BAe146

Output signals Dew/frost point, pressure, mirror balance,Coldfinger temperature

Output format: RS-232 and 0-10 VDC

Optional availability on FAAM BAe146 aircraft. Likely to become available as standard in the near future (as at Dec 2011).