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Enabling better global research outcomes in soil, plant & environmental monitoring.

LoRaWAN Leaf Wetness Monitoring Station

The Meter PHYTOS 31 leaf wetness sensor is standardised, calibrated, and designed to detect wetness (presence and duration) and ice formation right out of the box. No painting, baking, or user calibration required.

Sensitivity without False Positives

Each sensor is precisely factory-calibrated to detect tiny amounts of water and/or ice on the leaf surface. The sensor surface coating is non-hygroscopic, eliminating false wetness detection.

Mimics a Real Leaf

The sensor’s thin (0.65 mm) fibreglass construction closely approximates the overall radiation balance of a healthy leaf, so moisture will condense and evaporate from the sensor at the same rate as it would on a normal leaf.

V-Node: LoRaWAN Voltage Input Node

The V-NODE supports two differential or four single ended sensors. With a 24-bit ADC and stable 3V or 10V excitation voltages, the V-NODE designed for those requiring precision in their analogue measurements.

Use a SAFT Lithium-ion battery for low powered sensors or scale up the power system with a rechargeable Lithium-ion battery and external solar panel.


The PHYTOS 31 measures leaf surface wetness by measuring the dielectric constant of the sensor’s upper surface. It has a very low power requirement, which gives you the ability to make as many measurements as you want over a long period of time (such as a growing season) with minimal battery usage. This sensor also has very high resolution, which gives you the ability to detect very small amounts of water (or ice) on the sensor surface. Water on the sensor surface does not need to bridge electrical traces to be detected, as is common with resistance based surface wetness sensors.

This means that the PHYTOS 31 does not need to be painted before use, which eliminates the need for individual sensor calibration.


Measurement Speed: 10 ms
Sensor Type: Frequency domain
Output: 320 – 1000 mV @ 3 V excitation
Operating Environment: -40°C to 50°C
Power: 2.5 VDC @ 2 mA, to 5 VDC @ 7 mA
Cable Length: 5 m standard, custom lengths available
Cable Connector Types: 3.5 mm “stereo” plug or stripped and tinned lead wires (3)
Sensor Dimensions: 11.2 cm x 5.8 cm x .075 cm
EXPECTED LIFETIME: 2 + years of continuous use
Warranty: One year, parts and labour


  • LoRaWAN™ low-power long-range connectivity
  • Supports 2x differential or 4x single ended sensor.
  • 24-bit ADC with stable 3V or 10V excitation voltages
  • Optional 2 x 32-bit dry-contact counting digital inputs.
  • Solar rechargeable Lithium-ion, Single use LiSOCl2, or external 12V power options
  • Optional Multi-constellation GNSS
  • Optional Digital Pulse Inputs
  • Threshold Based Alarms
  • IP65 standard enclosure, IP67 optional