LWS-L Dielectric
Leaf Wetness Sensor
Revision: 3/09
C o p y r i g h t © 2 0 0 8 - 2 0 0 9
C a m p b e l l S c i e n t i f i c , I n c .
Страница 1: ...LWS L Dielectric Leaf Wetness Sensor Revision 3 09 C o p y r i g h t 2 0 0 8 2 0 0 9 C a m p b e l l S c i e n t i f i c I n c...
Страница 2: ...all other warranties expressed or implied including warranties of merchantability or fitness for a particular purpose CAMPBELL SCIENTIFIC INC is not liable for special indirect incidental or consequen...
Страница 3: ...escription 1 2 Specifications 1 3 Installation 2 4 Wiring 3 5 Measurement 3 6 Interpreting Data 3 7 Operational Principles 4 7 1 Measurement 4 7 2 Leaf Mimicry 5 8 Example Programs 5 8 1 CR10X Datalog...
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Страница 5: ...ace wetness by measuring the dielectric constant of the sensor s upper surface The sensor is able to detect the presence of miniscule amounts of water or ice Individual sensor calibration is not norma...
Страница 6: ...Leaf Wetness Sensor 3 Installation The LWS L is designed to be mounted on a small diameter rod Deployment in a plant canopy or on a weather station mast is typical Two holes in the sensor body are av...
Страница 7: ...of the excitation voltage The LWS L is intended only for applications wherein the datalogger provides short excitation leaving the probe quiescent most of the time Continuous excitation may cause the...
Страница 8: ...nts Collect data frequently enough to capture changes in surface wetness A sample frequency of 15 minutes or less is usually necessary to accurately capture leaf wetness duration NOTE 7 Operational Pr...
Страница 9: ...surface coating of the LWS L absorbs well in the near infra red region but the white color reflects most of the visible radiation Spectroradiometer measurements indicate that the overall radiation bal...
Страница 10: ...d changing the Boolean threshold Clean the sensing surface with a moist cloth periodically or when elevated dry output is detected LWS L sensors exposed to high levels of UV radiation develop a chalky...
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Страница 12: ...a Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300 N Cementerio Edificio Breller Santo Doming...
