Decagon Devices Dielectric Leaf Wetness Sensor Manuale del proprietario/operatore - Pagina 13

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4 INTERPRETING DATA

LWS

cleaned.

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

the wake interval. So, if again a 30 minute wake interval has been

chosen, the number in column 3 is the output in raw counts from

the LWS during the last minute of that 30 minute period. This data

column is output in case an extreme contamination event occurs,

forcing the dry output higher than 460 raw counts. In this case,

the user can identify an new wetness threshold from the time series

data, and calculate wetness duration from the new threshold until

the sensor can be cleaned. See the section at the end of this chapter

titled "Understanding Data from Other Data loggers" for more infor-

mation on this procedure. When using the data in this column, the

user can only obtain a wetness reading every wake interval (typically

30 minutes or more), instead of the one minute wetness resolution

available in column 1 and 2. Note that the conversion from Em50

raw counts to mV with 3,000 mV excitation is mV = raw counts

0.733.

4.1.2

Unprocessed Data File

When an unprocessed Excel ﬁle format is downloaded, three columns

of data are output for each LWS port.

Column 1: The cumulative number of minutes that the LWS out-

put has been over 450 raw counts since the Em50 data were last

erased or the accumulator has rolled over.

Note: The accumulator has a maximum of 2,048 minutes (1.42 days)

of wetness. If the cumulative wetness duration exceed this window

(which likely happens often), then the accumulator resets to zero and

begins accumulating again.

Column 2: The cumulative number of minutes that the LWS out-

put has been over 460 raw counts since you last erased the Em50 or

rolled over the accumulator. Again, this accumulator rolls over to

zero after 2,048 minutes of wetness.