Related Manuals for Campbell LWS
Summary of Contents for Campbell LWS
- Page 1 LWS Dielectric Leaf Wetness Sensor Revision: 2/17 C o p y r i g h t © 2 0 0 8 - 2 0 1 7 C a m p b e l l S c i e n t i f i c ,...
- Page 4 (780) 454-2655. Campbell Scientific (Canada) Corp. is unable to process any returns until we receive this form. If the form is not received within three days of product receipt or is incomplete, the product will be returned to the client at the client’s expense.
- Page 5 Periodically (at least yearly) check electrical ground connections. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CLIENT ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.
- Page 6 PLEASE READ FIRST About this manual Please note that this manual was originally produced by Campbell Scientific Inc. (CSI) primarily for the US market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: Area: 1 in...
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Page 8: Table Of Contents
B. Example Programs ..........B-1 Example CR1000 Program .............. B-1 Example CR6 Program ..............B-2 Figures 7-1. LWS Dielectric Leaf Wetness Sensor ..........6 7-2. Top view of a typical LWS installation ..........6 7-3. Typical LWS response ................. 8... - Page 9 Table of Contents Tables B-1. CR1000 Example Wiring ..............B-1 B-2. CR6 Example Wiring ..............B-2 CRBasic Examples B-1. CR1000 Program for Measuring the LWS ........B-1 B-2. CR6 Program for Measuring the LWS ..........B-2...
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Page 10: Introduction
If damage to the cable is suspected, contact Campbell Scientific. • Although the LWS is rugged, it should be handled as a precision scientific instrument. • Over time, the accumulation of dust and bird droppings can cause the dry output to rise. -
Page 11: Quickstart
LWS Dielectric Leaf Wetness Sensor QuickStart Short Cut is an easy way to program your datalogger to measure the LWS and assign datalogger wiring terminals. Short Cut is available as a download on www.campbellsci.com and the ResourceDVD. It is included in installations of LoggerNet, PC200W, PC400, or RTDAQ. - Page 12 LWS Dielectric Leaf Wetness Sensor Under the Available Sensors and Devices list, select the Sensors | Miscellaneous Sensors folder. Select LWS Dielectric Leaf Wetness Sensor. Click to move the selection to the Selected device window. Enter the Dry threshold (mV) < and Wet threshold (mV) >= values (see Section 7.3.2, Interpreting Data...
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Page 13: Overview
–1 has a heat capacity of 1480 J m . By mimicking the thermodynamic properties of a real leaf, the LWS closely matches the wetness state of the canopy. The sensor closely matches the radiative properties of real leaves. Healthy leaves generally absorb solar radiation in much of the visible portion of the spectrum, but selectively reject much of the energy in the near-infrared. -
Page 14: Specifications
(p. 2) Field Installation The LWS 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 available for mounting with zip ties or 4-40 bolts (FIGURE... -
Page 15: Wiring
LWS Dielectric Leaf Wetness Sensor FIGURE 7-1. LWS Dielectric Leaf Wetness Sensor FIGURE 7-2. Top view of a typical LWS installation Wiring TABLE 7-1. Wire Color, Wire Function, and Datalogger Connection Wire Color Wire Function Datalogger Connection Terminal Voltage U configured for voltage excitation... -
Page 16: Programming
7.3.1 Voltage Measurement The LWS requires excitation voltage between 2.5 and 5 Vdc. It produces an output voltage dependent on the dielectric constant of the medium surrounding the probe. Output voltage ranges from 10 to 50% of the excitation voltage. -
Page 17: Maintenance
Boolean threshold. Clean the sensing surface with a moist cloth periodically or when elevated dry output is detected. The LWS leaf wetness sensor is designed to withstand typical outdoor radiation and precipitation loads for greater than two years. If you are using the... -
Page 18: Acknowledgement
LWS Dielectric Leaf Wetness Sensor To apply UV Tech: Wipe sensor clean. Spray sensor surface with UV Tech. Rub with soft cloth until dry. Acknowledgement Portions of this manual are copyrighted by Decagon Devices, Inc. and are used by permission. - Page 19 LWS Dielectric Leaf Wetness Sensor...
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Page 20: Importing Short Cut Code Into Crbasic Editor
Appendix A. Importing Short Cut Code Into CRBasic Editor This tutorial shows: • How to import a Short Cut program into a program editor for additional refinement • How to import a wiring diagram from Short Cut into the comments of a custom program Short Cut creates files, which can be imported into CRBasic Editor. -
Page 22: Example Programs
TABLE B-1. CR1000 Example Wiring Color Function CR1000 White Excitation EX1 or VX1 Analog Out ⏚ Bare Analog Ground CRBasic Example B-1. CR1000 Program for Measuring the LWS 'CR1000 'Declare Variables and Units Public BattV Public PTemp_C Public LWmV Public LWMDry... -
Page 23: Example Cr6 Program
The wiring for the example is shown in TABLE B-2. TABLE B-2. CR6 Example Wiring Color Function White Excitation Analog Out ⏚ Bare Analog Ground CRBasic Example B-2. CR6 Program for Measuring the LWS 'CR6 Series 'Declare Variables and Units Public BattV Public PTemp_C Public LWmV Public... - Page 24 Scan(5,Sec,1,0) 'Default Datalogger Battery Voltage measurement 'BattV' Battery(BattV) 'Default Wiring Panel Temperature measurement 'PTemp_C' PanelTemp(PTemp_C,60) 'LWS Dielectric Leaf Wetness Sensor measurement 'LWmV' BrHalf(LWmV,1,mV5000,U2,U1,1,2500,False,10000,60,2500,0) 'Determine Minutes Dry 'LWMDry', Minutes Wet or Contaminated 'LWMCon', 'and Minutes Wet 'LWMWet' for this Scan LWMDry=0...
- Page 25 Appendix B. Example Programs...
- Page 27 Santo Domingo, Heredia 40305 SOUTH AFRICA COSTA RICA • cleroux@csafrica.co.za • info@campbellsci.cc www.campbellsci.co.za www.campbellsci.cc Campbell Scientific Southeast Asia Co., Ltd. Campbell Scientific Ltd. 877/22 Nirvana@Work, Rama 9 Road Campbell Park Suan Luang Subdistrict, Suan Luang District 80 Hathern Road Bangkok 10250...
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