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LWS-L Table of Contents 

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1.  General Description

.....................................................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 Datalogger Program.....................................................................5 
8.2  CR1000 Datalogger Program ...................................................................6 

9.  Maintenance

.................................................................6 

Figures 

1.  LWS-L Dielectric Leaf Wetness Sensor.....................................................2 
2.  Top View of a Typical LWS-L Installation................................................2 
3.  Typical LWS-L Response...........................................................................4 

Содержание LWS-L

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...

Страница 4: ...This is a blank page...

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...

Страница 11: ......

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...

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