The Soil Temperature and Humidity Bi-Sensor is used in agriculture to obtain data that enables influential parameters in plant development to be monitored.

Specifically, this sensor captures and communicates data on:

  • Soil temperature
  • Soil moisture content

This data can be viewed and analyzed from a mobile phone or other device with an internet connection, thanks to the Maher App. There are graphs where you can observe the evolution and behavior of these parameters; filtering by days, weeks or months.

Make smart irrigation decisions to achieve higher yields in your crops:

  • Optimize water use
  • Optimize fertilizer use
  • Increase crop productivity



Measuring and analyzing through the Soil Temperature and Humidity Sensor enables optimized water use since information is provided about the soil type in greater detail. Some examples of conclusions that can be obtained:

  • Areas with increased water seepage
  • Different types of soil on the same farm. More clayey, sandy, etc.
  • Areas in which there is greater water evaporation
  • Sectors with water deficit as a result of the irrigation system

Once these problems are detected. Decisions can be made that guarantee that the plant absorbs the correct amount of water at all times.

Having control of the soil temperature enables irrigation to be scheduled with optimal fertilizer use management that guarantees the root of the plant obtains the nutrients correctly. Soil temperature conditions microbial processes and influences nutrient absorption, especially phosphorus, which is lower in cold soils.

To monitor the Soil Temperature and Humidity Sensor readings, connect it to MAHER SENSORS, which enable the sensor readings to be sent directly to the cloud for viewing from the Maher App with any device with internet access (Smartphone, PC, Tablet, etc.)

It can also be connected to one of the irrigation controllers manufactured by Maher Electrónica. The main advantage of this system is that it displays of graphs and enables interaction with the controller based on the data received. Some examples:

  • Start and stop an irrigation schedule when soil moisture reaches a certain parameter. Soil moisture can therefore be maintained between a range of values
  • Maintain the soil temperature within a range of target values

Typical applications

The humidity and temperature bi-sensor is suitable for small and large farms. On large farms, multiple bi-sensors can be used to get representative data from the entire farm.

  • Farming operations
  • Outdoor crops
  • Greenhouses

Technical specifications

Measurement specifications

Volumetric Water Content (VWC)Range:
Calibration of mineral soils: 0.00–0.70 m3/m3
Hydroponic calibration: 0.0–1.0 m3/m3
Apparent dialectical permittivity (εa): 1 (air) to 80 (water) NOTE: The VWC range depends on the soil for which it is calibrated. Custom calibration is recommended for each soil type Resolution:
0.001 m3/m3

Precision:Generic calibration: ±0.03 m3/m3 typical in mineral soils having electrical conductivity in solution <8 dS/m Mean specific calibration: ±0.01–0.02 m3/m3 in any porous media Apparent dielectric permittivity (εa): 1–40 (ground range) , ±1 εa (no unit) 40–80, 15% of measurement

Dielectric measurement frequency70 MHz
TemperatureRange: −40 to 60 °C
Resolution: 0.1 °C
Precision: ±1 °C from −40 to 0 °C
±0.5°C from 0 to +60°C NOTE: Temperature measurement may not be accurate if the sensor is not completely submerged in the ground, due to longer equilibration time.

Communication specifications

OutputCommunication protocol DDI or SDI-12
Physical specifications
DimensionsLength: 9.4 cm (3.70 inside)
Width: 2.4 cm (0.95 inside)
Height: 7.5 cm (2.95 inside)
Sensor length5.5 cm (2.17 inside)
Cable length5 m (standard)
75 m (maximum custom cable length) NOTE: Please ask if a non-standard cable length is needed
Connector types3.5-mm stereo plug or stripped and tin-plated cables

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