KH20 Krypton Hygrometer
Misst schnelle Fluktuationen im atmosphärischen Wassergehalt
wetter wasser energie gas flux & turbulence bauwerke boden


Das KH20 ist ein Hygrometer zur Messung von schnellen Fluktuationen im atmoshärischen Wasserdampfgehalt (keine absoluten Konzentrationen). Normalerweise wird es zusammen mit dem CSAT3 in Eddy-Lovarianzsystemen eingesetzt.

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Funktionen und Vorteile

  • Compatible with most Campbell Scientific data loggers
  • High frequency response suitable for eddy-covariance applications
  • Well-suited for long-term, unattended applications


Technische Beschreibung

The KH20 is typically used with a CSAT3 Sonic Anemometer in eddy-covariance systems. This highly sensitive hygrometer measures rapid fluctuations in atmospheric water vapour. It does not measure absolute concentrations. The KH20 is compatible with most of our dataloggers.

Routine maintenance is required to keep source windows free of scale. The KH20 can be used with the window scaled if scaled calibration is used.


Type Ultraviolet krypton hygrometer
Current Consumption 20 mA max (at 12 Vdc)
Power Consumption 0.24 W
Output Signal Range 0 to 5 Vdc
Cable Length 7.62 m (25 ft)
Mounting Pipe Length 50 cm (20 in.)
  • 29 x 23 x 3 cm (11.5 x 9 x 1.25 in.) for sensor head
  • 19 x 13 x 5 cm (7.5 x 5 x 2 in.) for electronics box
  • 29 x 18 x 6.5 cm (11.5 x 7 x 2.5 in.) for rain shield with mount
  • 64 x 38 x 18 cm (25 x 15 x 7 in.) for carrying case
Weight 6.8 kg (15 lb)

Kompatibel mit

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.


Product Compatible Note
CR200X (retired)
CR216X (retired)
CR5000 (retired)

Additional Compatibility Information

Data Logger Considerations

The KH20 requires one single-ended analog input (signal is 0 to 5 Vdc), 12 V power, and ground.


FAQs für

Number of FAQs related to KH20: 4

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  1. The sensors used in the eddy-covariance flux application, including the KH20, are not supported by SCWin.

  2. The seal around the source/detector tubes is not user serviceable. If the seal has failed, return the KH20 to the factory for repair. Follow the steps listed on our Repair and Calibration page to request a returned material authorization (RMA) number. 

  3. For a description, refer to the “Basic Measurement Theory” section in Appendix A of the KH20 Krypton Hygrometer Instruction Manual.

  4. An open-path eddy-covariance program is available for purchase as pn 18442CRBasic Basic Eddy Covariance Program. This is the program without energy balance sensors. Also available is pn 18443, CRBasic Extended Eddy Covariance Program, with energy balance sensors. To order a custom configured program, contact the Micrometeorology Flux group for assistance.


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