Decagon Devices Dielectric Leaf Wetness Sensor Owner's/Operator's Manual - Page 14

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LWS

4 INTERPRETING DATA

Column 3: The ﬁnal reading (in raw counts) of the LWS during

the wake interval. (See column 3 description under precessed the

ﬁles above)

4.1.3

DataTrac3 File

When you download the DataTrac3 ﬁle format (.dxd), a single 10

digit number downloads for each sensor. The .dxd format easily

imports into Decagon's convenient DataTrac3 graphing software. It

also has the advantage that it can be converted with

Utility

to the other ﬁle formats listed above. See the manual for your Em50

data logger for details on exporting data.ﬀorm

4.2

Understanding Data from Other Data Loggers

With non-Em50 data loggers, the user needs to establish a wetness

threshold for their system. The dry output of the LWS varies with

excitation voltage (note that the acceptable excitation voltage range

is 2.5 to 5 V). The LWS dry output is easily determined from time

series data such as those presented in Figure 4. A wetness threshold

should be chosen that is slightly above the dry output, and subse-

quent readings should be compared to the dry output to determine

surface wetness. When using a non-Em50 data Logger, it is im-

portant to collect data frequently enough to capture changes in the

surface wetness. A sampling frequency of 15 minutes or less is often

necessary to accurately capture leaf wetness duration.