Leaf wetness and temperature sensor with RS-485/Modbus interface

The LWS-304 leaf wetness sensor precisely determines the degree of moisture of a leaf surface by measuring the dielectric constant and transmits the measured values via RS-485/Modbus.


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The leaf wetness sensor LWS-304 is used to observe and measure leaf wetness. The qualitative wetting of the leaves by precipitation or dew is measured. For this purpose, the sensor replicates the natural properties of a leaf so that the situation on the leaf surface is accurately reproduced. By measuring the change in the dielectric constant of the leaf surface, dew due to fog and water vapor as well as ice can also be measured. Furthermore, the temperature of the simulated leaf is measured.

Leaf wetness or leaf wetting is an agrometeorological measured value that is particularly important for the detection and prognosis of plant diseases. Leaf wetness sensors find application in field (wheat, potatoes), fruit and vine cultivation.

Technical Data

  • Measuring range leaf moisture: 0 - 100%
  • Leaf moisture accuracy: ±3% (0-50%); ±5% (###gt##50%);
  • Measuring range temperature: -40 ... +80 °C
  • Accuracy temperature: ±0.5 °C
  • Interface: RS-485 (Modbus)
  • Power supply: 12-24 V DC

Mechanical data

  • Protection class: IP65
  • Operating temperature: -40°C...+80°C
  • Dimensions: 65*13*145 mm
  • Cable length: 5m
  • Storage: -40°C...70°C; 20%...90% rel. humidity