Doc. # 7430-0710-01 Rev. C
Page
100
Sensor probe
Switchcraft
connector
as in a heavy rain, the signal can range up to around 1400 counts. Varying amounts of water on
the surface of the sensor cause a sensor output proportional to the amount of water on the
sensor's surface. Most leaf wetness applications (disease forecasting, etc.) don't require
knowledge of the
amount
of water on the surface - only if there is
any
water on the surface. To
make this determination, a sensor output threshold corresponding to the minimum wet state must
be identified.
Figure 8-6. Sample raw output from the leaf wetness sensor
8.5 eS1401 solar radiation sensor
The eS1401 uses solar radiation sensor from Davis. It measures global radiation, both the direct
and diffuse components of solar irradiance. This allows users to monitor evapotranspiration.
From the sensor’s output voltage, the console calculates and displays solar irradiance. It also
integrates the irradiance values and displays total incident energy over a set period of time.
Figure 8-7. eS1401 solar radiation sensor
