LWS Decagon - Campbell Scientific
Contents
1. gt 4 Miscellaneous Sensors Q 237 Leaf Wetness Sensor 1 CS10 Current Transformer L Datalogger Battery Voltage Q JC Ultrasonic Depth Sensor al Q LWS Dielectric Leaf Wetness L PS200 CH200 12 V Charging R LJ SRSO Sonic Ranging Sensor S el lt LWS Dielectric Leaf Wetness Sensor Version 1 2 Ir Properties Wiring Voltage LWmV mv Minutes dry LWMDry Minutes Minutes wet or contaminated LWMCon Minutes Minutes wet LWMWet Minutes Dry threshold mV lt 274 lt Wet threshold mV gt 284 lt 4 1 WS Nielertrir eaf Watness Sencar a LWS Dielectric Leaf Wetness Sensor 5 Overview 6 After selecting the sensor click at the left of the screen on Wiring Diagram to see how the sensor is to be wired to the datalogger The wiring diagram can be printed out now or after more sensors are added Eile Program Tools Help CR1000 Progress 1 New Open CR1000 Wiring Diagram for untitled scw Wiring details can be found in the help file 2 Datalogger 3 Sensors LWS LWmV LWMDry LWMCon LWMWet PER 4 Outputs 5 Finish Red 1H Bare Ground White VX1 or EX1 Wiring Wiring Diagram Wiring Text Select any other sensors you have then finish the remaining Short Cut steps to complete the program The remaining steps are outlined in Short Cut Help which is accessed by clicking on Help Contents Progra2. be accompanied by a purchase order Quotations for repairs can be given on request It is the policy of Campbell Scientific to protect the health of its employees and provide a safe working environment in support of this policy a Declaration of Hazardous Material and Decontamination form will be issued for completion When returning equipment the Repair Reference Number must be clearly marked on the outside of the package Complete the Declaration of Hazardous Material and Decontamination form and ensure a completed copy is returned with your goods Please note your Repair may not be processed if you do not include a copy of this form and Campbell Scientific Ltd reserves the right to return goods at the customers expense Note that goods sent air freight are subject to Customs clearance fees which Campbell Scientific will charge to customers In many cases these charges are greater than the cost of the repair EE CAMPBELL SCIENTIFIC Campbell Scientific Ltd 80 Hathern Road Shepshed Loughborough LE12 9GX UK Tel 44 0 1509 601141 Fax 44 0 1509 601091 Email support campbellsci co uk www campbellsci co uk PLEASE READ FIRST About this manual Please note that this manual was originally produced by Campbell Scientific Inc primarily for the North American market Some spellings weights and measures may reflect this origin Some useful conversion factors Area lin square inch 645 mm Mass 1 oz
3. S A CSCC 300N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc e info campbellsci cc Campbell Scientific Ltd CSL 80 Hathern Road Shepshed Loughborough LE12 9GX UNITED KINGDOM www campbellsci co uk e sales campbellsci co uk Campbell Scientific Ltd France 3 Avenue de la Division Leclerc 92160 ANTONY FRANCE www campbellsci fr e info campbellsci fr Campbell Scientific Spain S L Avda Pompeu Fabra 7 9 Local 1 08024 BARCELONA SPAIN www campbellsci es e info campbellsci es Campbell Scientific Ltd Germany Fahrenheitstrasse13 D 28359 Bremen GERMANY www campbellsci de e info campbellsci de Campbell Scientific Beijing Co Ltd 8B16 Floor 8 Tower B Hanwei Plaza 7 Guanghua Road Chaoyang Beijing 100004 P R CHINA www campbellsci com e info campbellsci com cn Please visit www campbellsci com to obtain contact information for your local US or International representative
4. These files normally reside in the C campbellsci SCWin folder and have the following extensions DEF wiring and memory usage information CR2 CR200 X datalogger code CR6 CR6 datalogger code CR1 CR1000 datalogger code CR8 CR800 or CR850 datalogger code CR3 CR3000 datalogger code CR5 CR5000 datalogger code Use the following procedure to import Short Cut code into CRBasic Editor CR200 X CR6 CR1000 CR800 CR850 CR3000 CR5000 dataloggers 1 Create the Short Cut program following the procedure in Section 4 Quickstart p 1 Finish the program and exit Short Cut Make note of the file name used when saving the Short Cut program Open CRBasic Editor Click File Open Assuming the default paths were used when Short Cut was installed navigate to C CampbellSci SCWin folder The file of interest has a CR2 CR6 CRI CR8 CR3 or CR5 extension for CR200 X CR6 CR1000 CR800 CR850 CR3000 or CR5000 dataloggers respectively Select the file and click Open Immediately save the file in a folder different from Campbellsci SCWin or save the file with a different file name Once the file is edited with CRBasic Editor Short Cut can no longer be used to edit the datalogger program Change the name of the program file or move it or Short Cut may overwrite it next time it is used The program can now be edited saved and sent to the datalogger Import wirin
5. ounce 28 35 g 1 Ib pound weight 0 454 kg Length 1 in inch 25 4 mm 1 ft foot 304 8 mm Pressure 1 psi Ib in 68 95 mb 1 yard 0 914 m 1 mile 1 609 km Volume 1 UK pint 568 3 ml 1 UK gallon 4 546 litres 1 US gallon 3 785 litres In addition while most of the information in the manual is correct for all countries certain information is specific to the North American market and so may not be applicable to European users Differences include the U S standard external power supply details where some information for example the AC transformer input voltage will not be applicable for British European use Please note however that when a power supply adapter is ordered it will be suitable for use in your country Reference to some radio transmitters digital 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 some cases alternatives are offered Details of the alternatives will be covered in separate manuals Part numbers prefixed with a symbol are special order parts for use with non EU variants or for special installations Please quote the full part number with the when ordering Recycling information At the end of this product s life it should not be put in commercial or domestic refuse but sent for recycling Any batteries contained within the pro
6. probe s output The ExDelSE instruction and parameters are as follows ExDelSE Dest Reps SEChan ExChan ExmV Delay Mult Offset 7 3 2 Interpreting Data Many leaf wetness applications such as phytopathology require a Boolean interpretation of leaf wetness data such as whether or not water is present A Boolean threshold is determined by analysing a few days of time series data Consider time series data in Figure 7 3 which were obtained at 5 Vdc excitation The sensor yields 445 mV when dry 475 mV when frosted and gt 475 mV when wet Therefore a Boolean wetness threshold of 500 mV should serve well for interpreting these data LWS Dielectric Leaf Wetness Sensor dew rainfall 1200 1100 1000 2 5 3 900 o 800 n 2 700 gt o 2 600 9 S 500 400 300 4 72 50 NOTE 73 00 wetness threshold 73 50 74 00 74 50 75 00 75 50 time days Figure 7 3 Typical LWS response Duration of leaf wetness can be determined either by post processing of data or by programming the datalogger to accumulate time of wetness based on the Boolean threshold Accumulation of dust and debris such as avian faecal matter will change the Boolean threshold So while having the datalogger accumulate time of leaf wetness or time of frost may be convenient assurance of data quality requires retention of the base mV measurements Collect data frequently enough to c
7. 2 CR1000 Example Wiring iii CR6 Example Wiring 1 2 3 4 Introduction NOTE LWS Dielectric Leaf Wetness Sensor Direct measurement of leaf wetness is problematic Secure long term attachment of a sensor to a representative living leaf is difficult Leaf position sun exposure and health are in constant flux To avoid these problems leaf wetness sensors have been developed to estimate by inference the wetness of nearby leaves The LWS estimates leaf surface 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 normally necessary This manual provides information only for CRBasic dataloggers It is also compatible with most of our retired Edlog dataloggers For Edlog datalogger support see an older manual at www campbellsci com old manuals or contact a Campbell Scientific application engineer for assistance Cautionary Statements READ AND UNDERSTAND the Precautions section at the front of this manual Care should be taken when opening the shipping package to not damage or cut the cable jacket If damage to the cable is suspected consult with a Campbell Scientific application engineer 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 We re
8. Dry LWMCon 0 LWMWet 0 Default Datalogger Battery Voltage measurement BattV Default Wiring Panel Temperature measurement PTemp_C LWS Dielectric Leaf Wetness Sensor measurement LUmV BrHalf LWmV 1 mV2500 1 1 1 2500 False 10000 6 Hz 2500 0 Determine Minutes Dry LWMDry Minutes Wet or Contaminated LWMCon and Minutes Wet Appendix B Example Programs If LWmV lt 274 Then LWMDry 08333333 Else If LWmV gt 284 Then LWMWet 08333333 Else LWMCon 08333333 EndIf EndIf Call Data Tables and Store Data CallTable Table1 CallTable Table2 NextScan EndProg B 2 Example CR6 Program The wiring for the example is shown in Table B 2 Table B 2 CR6 Example Wiring Colour Function CR6 White Excitation Ul Red Analogue Out U2 Bare Analogue Ground CR6 Series Declare Variables and Units Public BattV Public PTemp_C Public LWmV Public LWMDry Public LWMCon Public LWMWet Units BattV Volts Units PTemp_C Deg C Units LWmV mV Units LWMDry Minutes Units LWMCon Minutes Units LWMWet Minutes Define Data Tables DataTable Table1 True 1 DataInterval 0 60 Min 10 Sample 1 LWmV FP2 Totalize 1 LWMDry FP2 False Totalize 1 LWMCon FP2 False Totalize 1 LWMWet FP2 False EndTable Appendix B Example Programs DataTable Table2 True 1 DataInterval 0 1440 Min 10 Minimum 1 BattV FP2 False False EndTable Main Program BeginProg Mai
9. IVANVIA JASA FE CAMPBELL 5 SCIENTIFIC SL WHEN MEASUREMENTS MATTER LWS Dielectric Leaf Wetness Sensor q VI Ji Issued 14 4 15 Copyright 2008 2015 Campbell Scientific Inc Printed under licence by Campbell Scientific Ltd CSL 771 Guarantee This equipment is guaranteed against defects in materials and workmanship This guarantee applies for 24 months from date of delivery We will repair or replace products which prove to be defective during the guarantee period provided they are returned to us prepaid The guarantee will not apply to e Equipment which has been modified or altered in any way without the written permission of Campbell Scientific e Batteries e Any product which has been subjected to misuse neglect acts of God or damage in transit Campbell Scientific will return guaranteed equipment by surface carrier prepaid Campbell Scientific will not reimburse the claimant for costs incurred in removing and or reinstalling equipment This guarantee and the Company s obligation thereunder is in 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 before returning equipment and obtain a Repair Reference Number whether the repair is under guarantee or not Please state the faults as clearly as possible and if the product is out of the guarantee period it should
10. apture changes in surface wetness A sample frequency of 15 minutes or less is usually necessary to accurately capture leaf wetness duration 8 Maintenance Over time the accumulation of dust and debris will cause the dry output to increase and changing the 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 LWS in areas with non typical unusually high radiation loads we recommend additional applications of McNett UVTech available from www mcnett com be reapplied every 45 days McNett is the only tested and approved UV blocking system for this leaf wetness sensor To apply McNett UV Tech 1 Wipe sensor clean 2 Spray sensor surface with McNett UV Tech 3 Rub with soft cloth until dry User Manual 9 Acknowledgement Portions of this manual are copyrighted by Decagon Devices Inc and are used by permission LWS Dielectric Leaf Wetness Sensor 10 Appendix A Importing Short Cut Code into a Program Editor This tutorial shows NOTE e How to import a Short Cut program into a program editor for additional refinement e How to import a wiring diagram from Short Cut into the comments of a custom program Short Cut creates files that can be imported into either CRBasic Editor or Edlog program editor
11. commend that the sensor be periodically cleaned using a moist cloth or when you detect elevated dry output The LWS is intended only for applications wherein the datalogger provides short excitation leaving the probe quiescent most of the time Continuous excitation may cause the probe to exceed government specified limits on electromagnetic emissions Initial Inspection Quickstart Upon receipt of the LWS inspect the packaging and contents for damage File damage claims with the shipping company The model number and cable length are printed on a label at the connection end of the cable Check this information against the shipping documents to ensure the correct product and cable length are received Short Cut is an easy way to program your datalogger to measure the LWS and assign datalogger wiring terminals The following procedure shows using Short Cut to program the LWS LWS Dielectric Leaf Wetness Sensor 3 Install Short Cut by clicking on the install file icon Get the install file from either www campbellsci com the ResourceDVD or find it in installations of LoggerNet PC200W PC400 or RTDAQ software The Short Cut installation should place a Short Cut icon on the desktop of your computer To open Short Cut click on this icon When Short Cut opens select New Program File Program Tools Help Test Progress Welcome to Short Cut Short Cut will 1 New Open help you generate a datalogger x program The basic st
12. duct or used during the products life should be removed from the product and also be sent to an appropriate recycling facility Campbell Scientific Ltd can advise on the recycling of the equipment and in some cases Sz arrange collection and the correct disposal of it although charges may apply for some items or territories For further advice or support please contact Campbell Scientific Ltd or your local agent fz CAMPBELL 5 SCIENTIFIC Campbell Scientific Ltd Campbell Park 80 Hathern Road Shepshed Loughborough LE12 9GX UK Tel 44 0 1509 601141 Fax 44 0 1509 601091 Email support campbellsci co uk www campbellsci co uk Precautions DANGER MANY HAZARDS ARE ASSOCIATED WITH INSTALLING USING MAINTAINING AND WORKING ON OR AROUND TRIPODS TOWERS AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS CROSSARMS ENCLOSURES ANTENNAS ETC FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE INSTALL OPERATE USE AND MAINTAIN TRIPODS TOWERS AND ATTACHMENTS AND FAILURE TO HEED WARNINGS INCREASES THE RISK OF DEATH ACCIDENT SERIOUS INJURY PROPERTY DAMAGE AND PRODUCT FAILURE TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS CHECK WITH YOUR ORGANIZATION S SAFETY COORDINATOR OR POLICY FOR PROCEDURES AND REQUIRED PROTECTIVE EQUIPMENT PRIOR TO PERFORMING ANY WORK Use tripods towers and attachments to tripods and towers only for purposes for which they are designed Do not exceed design limits Be familiar and comp
13. eps are 1 Create New Open Program 2 Select Datalogger 3 Select Sensors 4 Select Outputs 5 Finish Compile the Program Click Open Program to open an L Opan Program existing Short Cut program User Manual 4 Select Datalogger Model and Scan Interval default of 5 seconds is OK for most applications Click Next File Program Tools Help Test Progress 1 New Open 2 Datalogger 3 Sensors 4 Outputs Finish Wiring Wiring Diagram Wiring Text Select the Datalogger Model for which you wish to create a lt program Select the Scan Interval This is how frequently measurements are made Datalogger Model SE CR1000 L Scan Interval 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 lt and Wet threshold mV gt values see Section 7 3 2 Interpreting Data p 7 for information about determining the dry threshold and wet threshold values File Program Tools Help Progress 1 New Open 2 Datalogger 3 Sensors 4 Outputs 5 Finish Wiring Wiring Diagram Wiring Text Available Sensors and Devices Selected amp CR1000 Sensor Measurement 4 y Sensors lt 4 CR1000 Generic MeaSurements Geotechnical amp Structural 4 Default Battv 1 Meteorological PTemp_C
14. g information to the program by opening the associated DEF file Copy and paste the section beginning with heading Wiring for CRXXX into the CRBasic program usually at the head of the file After pasting edit the information such that a character single quotation mark begins each line This character instructs the datalogger compiler to ignore the line when compiling the datalogger code Appendix A Importing Short Cut Code Into a Program Editor Appendix B Example Programs B 1 Example CR1000 Program The wiring for the example is shown in Table B 1 Table B 1 CR1000 Example Wiring Colour Function CR1000 White Excitation EX1 or VX1 Red Analogue Out SEI Bare Analogue Ground CR1000 Declare Variables and Units Public BattV Public PTemp_C Public LWmV Public LWMDry Public LWMCon Public LWMWet Units BattV Volts Units PTemp_C Deg C Units LWmV mV Units LWMDry Minutes Units LWMCon Minutes Units LWMWet Minutes Define Data Tables DataTable Table1 True 1 DataInterval 0 60 Min 10 Sample 1 BattV FP2 Sample 1 PTemp_C FP2 Sample 1 LWmV FP2 Totalize 1 LWMDry FP2 False Totalize 1 LWMCon FP2 False Totalize 1 LWMWet FP2 False EndTable DataTable Table2 True 1 DataInterval 0 1440 Min 10 Minimum 1 BattV FP2 False False EndTable Main Program BeginProg Main Scan Scan 5 Sec 1 0 Battery BattV PanelTemp PTemp_C _60Hz LWMWet for this Scan LWM
15. ials and tools Utility and Electrical e You can be killed or sustain serious bodily injury if the tripod tower or attachments you are installing constructing using or maintaining or a tool stake or anchor come in contact with overhead or underground utility lines e Maintain a distance of at least one and one half times structure height or 20 feet or the distance required by applicable law whichever is greater between overhead utility lines and the structure tripod tower attachments or tools e Prior to performing site or installation work inform all utility companies and have all underground utilities marked e Comply with all electrical codes Electrical equipment and related grounding devices should be installed by a licensed and qualified electrician Elevated Work and Weather e Exercise extreme caution when performing elevated work e Use appropriate equipment and safety practices e During installation and maintenance keep tower and tripod sites clear of un trained or non essential personnel Take precautions to prevent elevated tools and objects from dropping e Do not perform any work in inclement weather including wind rain snow lightning etc Maintenance e Periodically at least yearly check for wear and damage including corrosion stress cracks frayed cables loose cable clamps cable tightness etc and take necessary corrective actions e Periodically at least yearly check electrical ground connection
16. ly with all instructions provided in product manuals Manuals are available at www campbellsci eu or by telephoning 44 0 1509 828 888 UK You are responsible for conformance with governing codes and regulations including safety regulations and the integrity and location of structures or land to which towers tripods and any attachments are attached Installation sites should be evaluated and approved by a qualified engineer If questions or concerns arise regarding installation use or maintenance of tripods towers attachments or electrical connections consult with a licensed and qualified engineer or electrician General e Prior to performing site or installation work obtain required approvals and permits Comply with all governing structure height regulations such as those of the FAA in the USA e Use only qualified personnel for installation use and maintenance of tripods and towers and any attachments to tripods and towers The use of licensed and qualified contractors is highly recommended e Read all applicable instructions carefully and understand procedures thoroughly before beginning work e Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers e Do not climb tripods or towers at any time and prohibit climbing by other persons Take reasonable precautions to secure tripod and tower sites from trespassers e Use only manufacturer recommended parts mater
17. mming Steps If LoggerNet PC400 RTDAQ or PC200W is running on your PC and the PC to datalogger connection is active you can click Finish in Short Cut and you will be prompted to send the program just created to the datalogger If the sensor is connected to the datalogger as shown in the wiring diagram in step 6 check the output of the sensor in the datalogger support software data display to make sure it is making reasonable measurements 5 1 Measurement 5 2 Leaf Mimicry The LWS is designed to approximate the thermodynamic properties of most leaves If the specific heat of a typical leaf is estimated at 3750 J kg K density estimated at 0 95 g cm and thickness estimated at 0 4 mm then the heat capacity of the leaf is 1425 Jm K This heat capacity is closely approximated by the thin 0 65 mm fiberglass construction of the LWS which has a heat capacity of 1480 Jm K By mimicking the thermodynamic properties of a real leaf the LWS closely matches the wetness state of the canopy The LWS measures the dielectric constant of a zone approximately cm from the upper surface of the sensor The dielectric constant of water 80 and ice 5 are much higher than that of air 1 so the measured dielectric constant is strongly dependent on the presence of moisture or frost on the sensor surfaces The sensor outputs an mV signal proportional to the dielectric of the measurement zone and therefore proportional to the amount of wa
18. n Scan 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 LWMCon 0 LWMWet If LWmV lt 274 Then LWMDry 0 08333333 Else If LWmV gt 284 Then LWMWet 0 08333333 Else LWMCon 0 08333333 EndIf EndIf Call Data Tables and Store Data CallTable Table1 CallTable Table2 NextScan EndProg CAMPBELL SCIENTIFIC COMPANIES Campbell Scientific Inc CSI 815 West 1800 North Logan Utah 84321 UNITED STATES www campbellsci com e info campbellsci com Campbell Scientific Africa Pty Ltd CSAf PO Box 2450 Somerset West 7129 SOUTH AFRICA www csafrica co za e sales csafrica co za Campbell Scientific Australia Pty Ltd CSA PO Box 8108 Garbutt Post Shop QLD 4814 AUSTRALIA www campbellsci com au e info campbellsci com au Campbell Scientific do Brazil Ltda CSB Rua Apinag s nbr 2018 Perdizes CEP 01258 00 S o Paulo SP BRAZIL www campbellsci com br e vendas 2campbellsci com br Campbell Scientific Canada Corp CSC 14532 131 Avenue NW Edmonton Alberta TSL 4X4 CANADA www campbellsci ca e dataloggers campbellsci ca Campbell Scientific Centro Caribe
19. program exclusively with Short Cut If your data acquisition needs are more complex the files that Short Cut creates are a great User Manual source for programming code to start a new program or add to an existing custom program NOTE Short Cut cannot edit programs after they are imported and edited in CRBasic Editor A Short Cut tutorial is available in Section 4 Quickstart p 1 If you wish to import Short Cut code into CRBasic Editor to create or add to a customized program follow the procedure in Appendix A Importing Short Cut Code into a Program Editor p A 1 Programming basics for CRBasic dataloggers are provided in the following sections A complete program example for a CRBasic datalogger can be found in Appendix B Example Programs p B 1 Programming basics and programming examples for Edlog dataloggers are provided at www campbellsci com old manuals 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 Except for the CR200 X CRBasic dataloggers use the BRHalf instruction to measure the probe s output The BRHalf instruction and parameters are as follows BRHalf Dest Reps Range SeChan ExChan MeasPEx ExmV RevEx Settling Integ Mult Offset The CR200 X uses the ExDelSE CRBasic instruction to measure the
20. s WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS THE CUSTOMER 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 Contents PDF viewers These page numbers refer to the printed version of this document Use the PDF reader bookmarks tab for links to specific sections 1 2 3 4 5 8 9 Introduction sea Cautionary StateMents 11111 gt gt Initial Inspection nnee nennen tenemen Quickstart na na OVEN VICW incaico 5 1 Me surement ee el ES 3 2 Beat MIMICLYs us Specifications 1ssserrersezezzaneo ne Installation rr ia ener ne nei 7 1 Field Install tion 2 8 8 1 2 O E a seed coh cores anne eos 7 3 1 Voltage Measurement ii 7 3 2 Interpreting Data i Maintenance s s sssssrsrerene nine ninaninana Acknowledgement nanne eeen eeens Appendices A B Example Programs B 2 Example CR6 Program ii Figures 7 1 LWS Dielectric Leaf Wetness Sensor ennen 7 2 Top view of a typical LWS installation eee 123 Typical EWS response stervende dan nenn Importing Short Cut Code Into a Program Editar E E OEE B 1 Example CR1000 Program i Tables B 1 B
21. sions 11 2 cm x 5 8 cm x 075 cm Maximum Lead Length 76 m 250 ft Interchangeability Interchangeable without painting or individual calibration If you are programming your datalogger with Short Cut skip Section 7 2 Wiring p 6 and Section 7 3 Programming p 6 Short Cut does this work for you See Section 4 Quickstart p 1 for a Short Cut tutorial 7 1 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 7 1 and Figure 7 2 LWS Dielectric Leaf Wetness Sensor Mounting Holes Circuitry Sensing Area Figure 7 1 LWS Dielectric Leaf Wetness Sensor Figure 7 2 Top view of a typical LWS installation 7 2 Wiring Table 7 1 Wire Colour Function and Datalogger Connection CR200 X CR6 CR800 850 CR5000 Colour Function CR3000 CR1000 CR9000 X White Voltage Excitation Switched Voltage Excitation Red Analogue Out Single Ended Channel Bare Analogue Ground 7 3 Programming Short Cut is the best source for up to date datalogger programming code Programming code is needed e when creating a program for a new datalogger installation e when adding sensors to an existing datalogger program If your data acquisition requirements are simple you can probably create and maintain a datalogger
22. ter or ice on the sensor surface 6 7 User Manual 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 The surface coating of the LWS absorbs well in the near infrared region but the white colour reflects most of the visible radiation Spectroradiometer measurements indicate that the overall radiation balance of the sensor closely matches that of a healthy leaf During normal use prolonged exposure to sunlight can cause some yellowing of the coating which does not affect the probe s function The surface coating is hydrophobic similar to a leaf with a hydrophobic cuticle The sensor should match the wetness state of these types of leaves well but may not match the wetness duration of pubescent leaves or leaves with less waxy cuticles Specifications Installation Features e Imitates characteristics of a leaf e Does not require painting or calibration of individual sensors e Detects trace amounts of water or ice on the leaf surface e Compatible with Campbell Scientific CRBasic dataloggers CR6 CR200 X series CR800 CR850 CR1000 CR3000 CR5000 and CR9000 X Measurement Time 10 ms Excitation 2 5 Vdc 2 mA to 5 0 Vdc 7 mA Minimum Excitation Time 10 mS Output 10 to 50 of excitation Operating Temperature 20 to 60 C Probe Dimen
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