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Summary

A hygrometer is an instrument used to measure the amount of humidity and water vapour in the atmosphere, in soil, or in confined spaces. Modern electronic devices use temperature of condensation (called the dew point), or changes in electrical capacitance or resistance to measure humidity differences. The maximum amount of water vapor that can be held in a given volume of air (saturation) varies greatly by temperature; cold air can hold less mass of water per unit volume than hot air. Temperature can change humidity. Most instruments respond to (or are calibrated to read) relative humidity (RH), which is the amount of water relative to the maximum at a particular temperature expressed as percent.


ManufacturerBuck Research Instruments LL.C.
Model
Serial No.n/a
Typehumidity sensor



Contacts

NameInstitutionRole

Available devices and Specifications

NameModelType
Cryogenic Aircraft HygrometerCR-2humidity sensor
Cryogenic Aircraft HygrometerCR-2humidity sensor

Specifications of CR-2 (without mounting)

Dimension (L x W x H)

250 x 270 x 95 mm

Weight

3.2 kg

Power Supply

28 VDC

Data interface

serial interface (RS-232)

Position

Origin Description:The CR-2 is installed in the cockpit behind the pilot seat. The air inlet is fastened to the mail door.

Data logging, storage and archiving

Logged parameter

ParameterSensor Output TypeUnit
Coldfinger Temperaturetemperature°C
Mirror Temperaturetemperature°C
Pressurepressurembar
Water contentvolumetric water contentppmV

Rawdata storage on board

During flight CR-2 data are stored within the aircraft onboard DMS system.

Data archiving on land

After the flight CR-2 data are accessible via the land system of the aircraft data managment system (DMS).

DMS

Module name

B722 CR2 Hygrometer

Device name

Hygrometer CR-2

Parameters

Balance; Board Temperature [°C]; CR2 ASCII; Coldfinger Temperature [°C]; Date; ErrorText; Mirror Flag; Mirror Temperature [°C]; Mixing Ratio [ppmv]; PWM TEC; Pressure [mbar]; Status; Status Flag; Time


Documentation



Also see https://sensor.awi.de/ for calibration certificates of the sensors.


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