European Facility For Airborne Research

European Facility For Airborne Research May 29, 2022, 09:59

Instrument: Buck CR-2 Cryogenic Aircraft Hygrometer 2

Name Buck CR-2 Cryogenic Aircraft Hygrometer 2
Acronym Buck-CR2-FAAM
Manufacturer Buck Research
Operated by FAAM
Operated onboard

Instrument type

Name Dew/Frost-point hygrometer
Acronym Dew/Frost-point hygrometer

Principle of operation

Measured parameter Dew Point
Operating principle

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.
manual hygrometers

Measurement(s) Thermodynamics

Dimension and weight

External dimension
Weight 4.7


Operating mode In situ






Operational restriction

Operational requirements

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)

Certification approvals

Certified for operation on FAAM BAe146

Additional information

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

Output format: RS-232 and 0-10 VDC

Access, host and processing


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

Could also fit on any aircraft having the following characteristics

General description

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