Soil sensorStrengths of Murata soil sensors

「Under development」*Specifications are subject to change without notice.

High-precision EC sensors measure pore water EC with nine electrodes, an industry first.

Soil type, air type, water type, ion type . . . variables abound in EC measurement, but Murata EC sensors eliminate the uncertainty with multiple measurement patterns, and by changing resistance measurement ranges (cell constants).

< Example measurement patterns of Murata’s nine-electrode EC sensor >

Image 1 of high-precision EC sensor
Image 2 of high-precision EC sensor

High-performance EC sensors equipped with proprietary algorithms

With its three elements—grains, air, and pore water—soil is impossible to measure accurately with few electrodes due to the outsized impact of water content. However, Murata soil sensors are equipped with proprietary algorithms that make it possible to measure fertilizer content only.

Three constituent elements of soil

Soil comprises three elements: grains, air, and pore water.

Image 1 of soil
Image 2 of soil

The difference between conventional EC sensors and Murata’s high-performance EC sensors

Conventional EC sensors are impacted by the amount of water and fertilizer in soil.

Bulk EC is problematic because it considers all three soil elements to be resistors, and higher resistance values are more susceptible to the amount of water and fertilizer (ion) present.

Image of conventional EC sensor dependence on water content < Conventional EC sensor dependence on water content >

Murata soil sensors use proprietary algorithms to measure fertilizer content only.

To grow crops, farmers need to know the amount of fertilizer ions present in pore water, and crop growth depends on the fertilizer content in pore water. It is also important to avoid contaminating the water by over-fertilizing or accumulation of chemical fertilizers in soil due to constant fertilization.

Image of Murata EC sensor dependence on water content < Murata EC sensor dependence on water content >

High-precision water content sensors that correct temperature dependence and control the impact of ions

Murata’s sensors provide unfailingly accurate water content measurements with algorithm-enabled correction of temperature dependence and high-frequency measurements that control the impact of ions.

Image of comparison of water content sensor properties < Comparison of water content sensor properties >

Electrical specifications

*Specifications are subject to change without notice.

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Electrical conductivity (EC)   Comments
Measurement range [dS/m] 0-5  
Resolution [dS/m] 0.001  
Accuracy [%] ±3 FS
Temperature    
Measurement range [°C] −20-60  
Resolution [°C] 0.0625  
Accuracy [°C] ±1.0 ±1digit r.d.g
Moisture (volumetric water content)    
Measurement range [%] 0-60  
Resolution [%] 0.1  
Accuracy [%] ±3 FS
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Items minimum typical maximum minimum typical maximum Remark
  UART, RS232, RS485, MODBUS SDI-12  
Voltage [V] 3.0 - 6.0 9.6 - 16  
Working current [mA] 25 30 50 5 8.3 15 @Read/Write cycle
Working temperature [°C] −20 - 60 −20 - 60  
Measurement cycle [ms] Free Free  
Dustproofing/waterproofing IP68 equivalent IP68 equivalent