The KH20 is a highly sensitive hygrometer designed for measurement of rapid fluctuations in atmospheric water vapour, not absolute concentrations. It is typically used together with a CSAT3 in eddy-covariance systems.
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.
|Calibrated Range||1.7 to 19.5 g/m3 (nominal)|
|Type||Ultraviolet krypton hygrometer|
|Input Voltage Range||10 V to 16 Vdc|
|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.)|
|Weight||6.8 kg (15 lb)|
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
|CR10 (retired)||The CR10 requires a VDIV2:1 voltage divider.|
|CR10X (retired)||The CR10X requires a VDIV2:1 voltage divider.|
The KH20 requires one single-ended analog input (signal is 0 to 5 Vdc), 12 V power, and ground.
Number of FAQs related to KH20: 4
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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.
The sensors used in the eddy-covariance flux application, including the KH20, are not supported by SCWin.
An open-path eddy-covariance program is available for purchase as pn 18442, CRBasic 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.