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KH20

Krypton

Hygrometer

User Manual

Issued 23.3.10

Copyright

©

2010 Campbell Scientific Inc.

Printed under Licence by Campbell Scientific Ltd.

.

CSL 876

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Summary of Contents for KH20

Page 1: ...KH20 Krypton Hygrometer User Manual Issued 23 3 10 Copyright 2010 Campbell Scientific Inc Printed under Licence by Campbell Scientific Ltd CSL 876...

Page 2: ......

Page 3: ...lieu of all other guarantees expressed or implied including those of suitability and fitness for a particular purpose Campbell Scientific is not liable for consequential damage Please inform us befor...

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Page 5: ...l cell phones and aerials may also not be applicable according to your locality Some brackets shields and enclosure options including wiring are not sold as standard items in the European market in so...

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Page 7: ...tronics Box 3 4 Wiring 5 5 Datalogger Programming 6 5 1 KH20 Calibration 6 5 2 Example 1 CR3000 Program to Measure Water Vapour Fluctuations 7 6 Maintenance and Calibration 8 6 1 Visual Inspection 9 6...

Page 8: ...i Tables 1 Datalogger Connections for Differential Measurement 5 2 KH20 Calibration Ranges 6 A 1 Linear Regression Results for KH20 ln mV vs Vapour Density A 2 A 2 Final Calibration Values for KH20 A...

Page 9: ...he connectors are housed inside a rain shield 14113 that protects them from moisture The KH20 is suitable for long term continuous outdoor applications The KH20 sensor is comprised of two main parts t...

Page 10: ...aded aluminium pipe 3874 Nu rail 3 4 x 3 4 1017 Allen Wrench 5 32 4697 3 Installation 3 1 Siting When installing the KH20 sensor for latent heat flux measurement in an eddy covariance application prop...

Page 11: ...bottom front of the rain shield and then pushing the cover all the way up and sliding it out It will be difficult to mount the rain shield to a mast with the front cover on since the 1 2 inch nut hol...

Page 12: ...ll block the position of the connectors 3 Mount the rain shield onto the tripod or tower mast using the U bolt provided Make sure that the distance between the KH20 sensor head and the rain shield is...

Page 13: ...e two pan head screws to secure it in place 6 Gather any loose cables and tie them up using cable ties onto the tripod or tower mast 4 Wiring The KH20 sensor is shipped with a power signal cable with...

Page 14: ...cients are calculated See Appendix A for more information on KH20 calibration Table 2 KH20 Calibration Ranges Ranges Vapour Density g m3 Full Vapour Range 2 19 Dry Vapour Range 2 9 5 Wet Vapour Range...

Page 15: ...opriate values found from the calibration sheet of the KH20 Unit Definitions Units Units ln_mV ln mV natural log of the KH20 millivolts mV millivolts rho_w g m 3 Wiring ANALOG INPUT 1H KH20 signal whi...

Page 16: ...temp 250 Measure battery voltage Battery batt_volt Measure KH20 VoltDiff kh_mV 1 mV5000 1 TRUE 200 250 1 0 ln_kh LOG kh_mV rho_w ln_kh xkw CallTable stats CallTable ts_data NextScan EndProg 6 Maintena...

Page 17: ...ut reading is below 50 mV you may have problems with either the source tube or the detector tube For the detector tube testing see Section 6 3 below 6 3 Testing the Detector Tube If the source tube te...

Page 18: ...ean the scaled window After cleaning the window slide a clean dry swab across the window to confirm the scale has been removed You can use the water vapour absorption coefficient for scaled window fro...

Page 19: ...length for the KH20 sensor and w is the water vapour density w wx k e T A 1 If we express the transmissivity T in terms of the light intensity before and after passing through the material as measure...

Page 20: ...xkw 0 205 Y Intercept ln V0 8 033 If we substitute these values along with the measured lnV into equation A 3 we can obtain the water vapour density w Campbell Scientific Inc performs the calibration...

Page 21: ...20 A 3 Table A 2 Final Calibration Values for KH20 Vapour Range g m3 Slope xkw Y Intercept ln V0 Coefficient kw Full Range 1 74 19 25 0 205 3087 0 144 Dry Range 1 74 9 20 0 216 3259 0 151 Wet Range 7...

Page 22: ...CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc info campbell...

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