Davis leaf wetness sensor

Davis leaf wetness sensor

 

The leaf wetness sensor detects the presence of surface moisture.
The sensor is an artificial-leaf electrical-resistance type.
It consists of a sensing grid, low-voltage bi-polar excitation circuit, and conductivity-sensing circuit.
The sensor measures the conductivity across the grid and displays the result as a moisture level, scaled from 0 to 15.
The sensing grid is a gold-plated etched circuit on an epoxy-glass substrate.
The included mounting bracket holds the sensor at a 45° angle to simulate a typical leaf position and to permit runoff of excess moisture; it may be mounted on a vertical post, pipe, or stake, or on the sensor mounting arm.

Technical specifications:

 

  • Sensor type: artificial leaf electrical resistance
  • Excitation: bipolar (3V nominal) built-in
  • Time constant: 2s
  • Attached cable length: 12m
  • Cable type: 4 conductor, 26 AWG
  • Material:
    • Substrate: glass-reinforced, ceramic-filled laminate
    • Grid: copper, nickel, and gold platerame
    • Mounting bracket: white powder coated aluminum
  • Dimensions (length x width x height):
    • Leaf wetness sensor: 102mm x 58mm x 58mm
    • Sensor area: 28 cm2
  • Weight: 0,4kg

 

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