Decagon Devices Dielectric Leaf Wetness Sensor Manuel du propriétaire/de l'opérateur - Page 6

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LWS

About the Leaf Wetness Sensor

The LWS measures leaf surface wetness by measuring the dielectric

constant of the sensor's upper surface (see Section 5 for a more thor-

ough explanation). It has a very low power requirement, which gives

you the ability to make as many measurements as you want over a

long period of time (such as a growing season) with minimal bat-

tery usage. This sensor also has very high resolution, which gives

you the ability to detect very small amounts of water (or ice) on the

sensor surface. Water on the sensor surface does not need to bridge

electrical traces to be detected, as is common with resistance based

surface wetness sensors. This means that the LWS does not need

to be painted before use, which eliminates the need for individual

sensor calibration.

2.1

Speciﬁcations

Measurement Time: 10 ms

Power: 2.5 VDC @ 2 mA to 5 VDC @ 7 mA

Output: 320 to 1000 mV @ 3 V excitation

Operating Environment: -20 to 60 C

Probe Dimensions: 11.2 cm x 5.8 cm x .075 cm

Cable Length: 5 m standard, extension cables are available

Connector Type: 3.5 mm plug or optional "pigtail" adapter (stripped

and tinned lead wires)

Data Logger Compatibility (not exclusive):

Decagon: Em50, Em50R

Campbell Scientiﬁc: CR10, 10X, 21X, 23X, 1000, 3000, 5000

2 ABOUT THE LEAF WETNESS SENSOR