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

Decagon GS1 Rugged VWC

The GS1 is a ruggedised version of Decagon's basic, no-frills soil moisture only sensor. It accurately measures volumetric water content in soil or soilless media.

Monitor More, Spend Less

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

Epoxy Body Withstands Tough Field Conditions

This sensor is built to last longer in the field under warmer, wetter conditions. The epoxy body withstands water intrusion and the sensor is built for long-term installation.

Stainless Steel Needles for Easy Installation

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.

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 even small changes in water content anywhere from 0 – 100% VWC.

70 MHz Frequency Capacitance Technology

This frequency minimises 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.

Plug and Log with Decagon Data Loggers

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

Database and Graph Measurements

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

Compatible with Many Other Loggers

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.

Reasons to Pick the GS1

-You need an inexpensive soil moisture sensor that lasts a long time

-You need to measure VWC only in a harsh environment

-You are setting up a large-scale network of soil moisture sensors

Measurement Time 10 ms (milliseconds)
Accuracy ±0.03 m3/m3 in typical soils, up to 8 dS/m
With soil-specific calibration: ±0.01 to 0.02 m3/m3
Resolution: 0.001 m3/m3 VWC in mineral soils
Power Requirements 3.0 VDC to 15 VDC (absolute maximum) @ 15 mA. Output: 1,000 to 2,500 mV
Operating Environment -40 to 50°C
Range of Measurement 0 to 100% VWC
Sensor Dimensions 8.9 cm x 1.8 cm x 0.7 cm
Connector Types 3.5 mm (stereo) plug or stripped & tinned lead wires (Pigtail)
Cable Length 5m standard, custom cable lengths available upon request
Cable Connector Types 3.5 mm “stereo” plug, or stripped and tinned lead wires (3)
Sensor Dimensions 9.3 cm x 2.4 cm x 6.5 cm
Data Logger Compatibility (not exclusive) Decagon Em50 Series (Em50, Em50R, Em50G, and Em50B), ProCheck,
Campbell Scientific (CRX10, CR850, 1000, 3000, etc.)
  ANALOG SENSORS
SENSOR EC-5 10HS GS1
MEASURES volumetric water content, dielectric permittivity volumetric water content, dielectric permittivity volumetric water content, dielectric permittivity
VOLUME OF INFLUENCE 0.3 L 1 L TBD
DATA LOGGER COMPATIBILITY Em5b, Em50, Em50R, Em50G, ProCheck, ECH2O Check, Campbell Scientific* Em5b, Em50, Em50R, Em50G, ProCheck, ECH2O Check, Campbell Scientific* Em5b, Em50, Em50R, Em50G, ProCheck, ECH2O Check, Campbell Scientific*
Measurement RANGE 0 to 100% VWC 0 to 57% VWC 0 to 100% VWC
BEST IF VWC is all that you need. You’re establishing a large sensor network. You want a large measurement volume. VWC is all that you need. You’re establishing a large sensor network.
You’re installing in the side wall of a trench.
You need the most rugged sensor available.
BUT NOT IF You cannot apply a regulated voltage (only applies to non-Decagon data loggers). You are measuring in nursery pots. You are installing in rocky soil. You are installing sensors down bore holes.
  DIGITAL SENSORS
SENSOR 5TM 5TE GS3 10TM MAS-1
MEASURES volumetric water content, dielectric permittivity, temperature volumetric water content, dielectric permittivity, temperature, electrical conductivity volumetric water content, dielectric permittivity, temperature, electrical conductivity volumetric water content, dielectric permittivity, temperature volumetric water content
VOLUME OF INFLUENCE 0.3 L 0.3 L 0.3 L 1 L 0.3 L
DATA LOGGER COMPATIBILITY Em50, Em50R, Em50G, ProCheck, Campbell Scientific*, SDI-12 capable Em50, Em50R, Em50G, ProCheck, SDI-12 capable Em50, Em50R, Em50G, ProCheck, SDI-12 capable Em50, Em50R, Em50G, ProCheck, SDI-12 capable Any logger with 4-m20 mA input (not compatible with Decagon data loggers or ProCheck)
MEASUREMENT RANGE 0 to 100% VWC
-40 to 60°C
0 to 100% VWC
-40 to 60°C
0 to 23 dS/m
0 to 100% VWC
-40 to 60°C
0 to 23 dS/m
0 to 57% VWC
-40 to 60°C
0 to 100% VWC
-40 to 60°C
BEST IF You have high temperature variability in your soils.
You are monitoring shallow or desert soils where data must be corrected for temperature effects.
You need to monitor soil temperature for biological activities.
You want to use SDI-12.
You are managing salts in your system.
You want to use SDI-12.
You are measuring water content of soilless substrates.
You need high accuracy EC.
You need a large measurement volume.
You need to monitor soil temperature for biological activities.
You are working with a PLC with a 4-20 mA input.
You need extremely long cable lengths.
BUT NOT IF N/A You want to monitor soilless substrates or potting soils. You are installing sensors down bore holes. You need to measure water content close to the soil surface. You are installing in rocky soils. You want to use Decagon data loggers or ProCheck You need a low-power system.