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LWS Decagon Leaf Wetness Sensor - Page 1
LWS-L Dielectric Leaf Wetness Sensor
Revision: 3/09
Copyright © 2008-2009 Campbell Scientific, Inc.
LWS Decagon Leaf Wetness Sensor - Page 2
... territories. directly. Batteries have been subjected to modification, misuse, neglect, accidents of removing, reinstalling, and shipping defective products to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products. to any CAMPBELL SCIENTIFIC, INC. This warranty shall not apply to be returned without prior authorization. RMA#_____ 815 West 1800 North Logan...
LWS Decagon Leaf Wetness Sensor - Page 3
...Programs 5
8.1 CR10X Datalogger Program 5 8.2 CR1000 Datalogger Program 6
9. Interpreting Data 3 7. Maintenance 6 Figures
1. Specifications 1 3. LWS-L Dielectric Leaf Wetness Sensor 2 2. Installation 2 4. Measurement 3 6. General Description 1 2. Top View of this document. Typical LWS-L Response 4
i LWS-L Table of Contents
PDF viewers note: These page numbers refer to...
LWS Decagon Leaf Wetness Sensor - Page 5
... leaf is difficult. Individual sensor calibration is problematic. Leaf position, sun exposure, and health are in constant flux. The LWS-L estimates leaf surface wetness by inference the wetness of the sensor's upper surface. Specifications
Measurement Time:
10 ms
Excitation:
2.5 VDC (2 mA) to 5.0 VDC (7 mA)
Minimum Excitation Time: 10 mS
Output:
10% to...
LWS Decagon Leaf Wetness Sensor - Page 6
... holes in a plant canopy or on a small diameter rod. FIGURE 2.
Top View of a Typical LWS-L Installation 2 Installation
The LWS-L is designed to be mounted on a weather station mast is typical. LWS-L Dielectric Leaf Wetness Sensor circuitry
mounting holes
sensing area FIGURE 1. LWS-L Dielectric Leaf Wetness Sensor
3. Deployment in the sensor body are available for mounting with...
LWS Decagon Leaf Wetness Sensor - Page 7
... short excitation, leaving the probe quiescent most of time series data.
whether or not water is determined by analyzing a few days of the time. Wiring
LWS-L Dielectric Leaf Wetness Sensor
Color White Red
Bare
Description
CR800/850 CR5000 CR3000 CR1000
CR500/510 CR10/10X
21X CR7 CR23X
CR200
Excitation Switched Switched...
LWS Decagon Leaf Wetness Sensor - Page 8
...
Duration of leaf wetness can be convenient, assurance of data quality requires retention of the sensor. Operational Principles
7.1 Measurement
The LWS-L measures the dielectric constant of a zone approximately 1 cm from the upper surface of the base mV measurements. So, while having the datalogger accumulate time of ...
LWS Decagon Leaf Wetness Sensor - Page 9
...This heat capacity is ≈1425 J m-2 K-1. similar to a leaf with less waxy cuticles.
8. If the specific heat of a typical leaf is estimated at 3750 J kg-1 K-1, density estimated at 0.95 g/cm3, and ...the near -infrared. The surface coating is designed to sunlight can cause some yellowing of the LWS-L absorbs well in the near -infra red region, but may not match the wetness duration ...
LWS Decagon Leaf Wetness Sensor - Page 10
...LWS_mV, 1, mV2500, 1, VX1, 1, 2500, False, 10000, _60Hz, 2500, 0)
NextScan
EndProg
9. and are copyrighted by permission.
6
LWS-L sensors exposed to lose its "sheen" over time and a small amount of UV radiation develop a chalky residue on the sensor surface. ... and changing the Boolean threshold. Maintenance
Over time, the accumulation of this manual are used by Decagon Devices, Inc.
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