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Overview
The KH20 is a highly sensitive hygrometer designed for measurement of rapid fluctuations in atmospheric water vapor, not absolute concentrations. It is typically used together with a CSAT3B in eddy-covariance systems.
Read MoreBenefits and Features
- Compatible with most Campbell Scientific data loggers
- High frequency response suitable for eddy-covariance applications
- Well-suited for long-term, unattended applications
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Detailed Description
The KH20 is typically used with a CSAT3B Sonic Anemometer in eddy-covariance systems for measuring water vapor flux. This highly sensitive hygrometer measures rapid fluctuations in atmospheric water vapor. It does not measure absolute concentrations. The KH20 is compatible with most of our data loggers.
Routine maintenance is required to keep source windows free of scale. You can use the water vapor absorption coefficient for scaled window from the data report if the window will be allowed to scale during measurements.
Specifications
| 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.) |
| Dimensions |
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| Weight | 6.8 kg (15 lb) |
Compatibility
Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.
Data Loggers
| Product | Compatible | Note |
|---|---|---|
| 21X (retired) | ||
| CR10 (retired) | The CR10 requires a VDIV2:1 voltage divider. | |
| CR1000 (retired) | ||
| CR10X (retired) | The CR10X requires a VDIV2:1 voltage divider. | |
| CR200X (retired) | ||
| CR206X (retired) | ||
| CR211X (retired) | ||
| CR216X (retired) | ||
| CR23X (retired) | ||
| CR295X (retired) | ||
| CR3000 (retired) | ||
| CR500 (retired) | ||
| CR5000 (retired) | ||
| CR510 (retired) | ||
| CR800 (retired) | ||
| CR850 (retired) | ||
| CR9000 (retired) | ||
| CR9000X (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.
Documents
Brochures
Manuals
Frequently Asked Questions
Number of FAQs related to KH20: 4
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The sensors used in the eddy-covariance flux application, including the KH20, are not supported by SCWin.
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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 return material authorization (RMA) number.
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For a description, refer to the “Basic Measurement Theory” section in Appendix A of the KH20 Krypton Hygrometer Instruction Manual.
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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.
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