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  • RHT - Soil humidity sensor

RHT - Soil humidity sensor

  • Igrometro terreno
  • Igrometro terreno applicazione
  • RHT installazione nel terreno

Main Applications

  • Meteorology and Hydrogeology
  • Irrigation Systems and Agriculture
  • Biocompost monitoring and landfills 
  • Monitoring of forests

 

More information

Applicazioni Applications       Richiedi info preventivo Info / Quote request

 

 

 

 

  • Description
  • Specifications
  • Accessories
  • Download PDF
  • Description
  • Specifications
  • Accessories
  • Download PDF

Description

MEASURING PRINCIPLE AND FEATURES

 

The probe measures the dielectric constant of the soil in order to find its volumetric water content. Since the dielectric constant of water is much higher than that of air or soil minerals, the dielectric constant of the soil is a sensitive measure of water content. The RHT sensor supplies a 70 MHz oscillating wave to the sensor prongs that induces an electromagnetic field in the medium (soil) surrounding the sensor. The charging and discharging of the sensor is controlled by the dielectric of the surrounding soil.

A microprocessor on the sensor measures the charging of the sensor, and therefore the dielectric constant of the soil which is related to the water content of the soil. The microprocessor makes a dielectric measurement and updates the transmitted current once per second. The transmitted 4-20 mA current can be converted to the water content of the soil using a simple calibration function. The RHT was designed to be used with standard 4-20 mA controllers and monitoring systems

 

ADVANTAGES

  • High accuracy
  • Suitable for the main applications
  • No maintenance and long lifetime 
  • Low time of response

 

 

Specifications

 

Model RHT-I – Soil moisture sensor 
Typical measuring range  0 – 0.57 m3/m3 (0 -57% VWC Soil volumetric water content) 
Transducer  Electromagnetic
Output Standard 4…20mA, 2 wires 
Power +7…32Vdc (typ. 12Vdc); protections against overvoltages and polatity inversion included
Response time 1 s 
Accuracy

± 1-2% VWC with typical calibration set for the most part of porous soils
± 4 % VWC with factory calibration for mineral soils;

Working Temperature  -40…+50 °C
Cable 5m,  2x22 AWG wires (red and black) + 1x24 AWG wire (shield)
Dimensions

8.9 x 1.8 x 0.7 cm

 

 

 

Accessories

Supports and brackets for sensors

Cables for connectorized sensors

 

Download PDF

Documenti
Download this file (RHT soil moisture_Rev3_Eng.pdf)RHT soil moisture_Rev3_Eng.pdf[ ]798 kB

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