Decagon GS1 Sensor

– soil volumetric water content


Soil Moisture SensorThe GS1 is a low cost, ruggedized sensor for the measure of soil volumetric water content. The GS1 can accurately measure the moisture content in soil or soilless media.


monitor more, spend less

The longer lifetime of the GS1 helps your budget go further. It delivers research-grade accuracy at a price that makes large sensor networks economically practical. Characterize your site with sensors at multiple depths and locations, even on a tight budget.


tough design

This sensor is built to last longer in the field under warmer, wetter conditions. The epoxy body withstands harsh environments and water intrusion.


Two stainless steel needles cut through the soil for better soil-sensor contact and easier installation. Needles are also much more durable than our standard sensor blades.


Soil Moisture Probe


full water content range

The GS1 is sensitive across the entire water content range. It can be installed in dry desert soils or in very wet peat. Sensitive to small changes in water content anywhere from 0 – 100% VWC.


70 MHz frequency capacitance technology

This frequency minimizes salinity and textural effects, making the GS1 accurate in most soil or soilless media. Can be used in a variety of conditions with the factory calibration.


Em50 Data Loggerplug and log with Decagon data loggers

Install the GS1, plug it in to the Em50, set the measurement intervals, and start logging data. No programming required.


Use this sensor with DataTrac 3 to quickly and easily store, access, and compare soil water content data from a large installation.


The GS1 accepts a wide range of input voltages and has an easy-to-read voltage output. Voltage correlates to soil water content through a simple linear relationship, making this sensor easy to integrate into a wide variety of non-Decagon loggers.


advantages of the GS1
  • Inexpensive, ruggedized soil moisture sensor
  • Measure VWC in a harsh environment
  • Large volume of influence


related products


feature specification
Measurement Principle Capacitance
Measurement Range 0% VWC to saturation
Resolution 0.001 m3/m3 VWC in mineral soils
Accuracy ± 3% VWC with manufacturer's calibration | ± 1% VWC with custom calibration
Power Requirements 3.0 VDC to 15 VDC (absolute maximum) @ 15 mA
Output Analog voltage: 1,000 to 2,500 mV
Cable Length 5 m (standard) | 75 m (maximum)
Sensing Area 5.1 cm x 2.4 cm x 2.1 cm


further information