Measure water content and EC at multiple locations
While measuring water content and EC in greenhouse substrates is
not new, the ability to continuously monitor in multiple locations
is rarely possible because of the cost of accurate sensors.
The GS3 has Decagon's trademark high accuracy and low cost, but is
specifically designed for the greenhouse to make more extensive
spatial characterisation practical.
Accuracy at a fraction of the cost
The GS3 measures water content, temperature, and EC
independently. Its 70 MHz frequency minimizes salinity
and textural effects, making it accurate in almost any soil or
soilless media. Stainless steel needles have an extended surface
area to optimize EC measurements while minimising substrate
disturbance during insertion. Temperature is measured with an
on-board thermistor and electrical conductivity using a stainless
steel electrode array.
Understand your measurements
When used in conjunction with our DataTrac 3 software, GS3 data
can be used to determine plant available water, growing degree
days, and pore water electrical conductivity
Integrate with Campbell Scientific Data Loggers
Serial and SDI-12 communication options mean easy integration
with systems run by other data loggers (including Campbell
Scientific).
| Accuracy |
Apparent dielectric Permittivity (Ea):
±1Ea (unitless) from 1-40 (soil range), ±15% from
40-80
VWC: Using Topp equation: ±0.03m3/m3 (±3%
VWC) typical in mineral soils that have solution electrical
conductivity <10 dS/m
Using medium specific calibration,
±0.01-0.02m3/m3 (±1-2% VWC) in any porous
medium
Electrical Conductivity (EC): ±10% from 0 to 7 dS/m
Temperature: ±1°C |
| Resolution |
Ea: 0.1Ea (unitless) from 1-20,
<0.75Ea (unitless) from 20-80
VWC: 0.002 m3/m3 (0.2% VWC) from 0 to 40%
VWC, 0.001 m3/m3 (0.1% VWC) > 40%
VWC
EC: 0.001 dS/m from 0 to 23 dS/m
Temperature: 0.1°C |
| Range |
Ea: 1 (air) to 80 (water)
EC: 0-23 dS/m (bulk)
Temperature: -40-50°C |
| Measurement Speed |
150mS |
| Sensor Type |
VWC: Frequency domain
EC: Two probe design
Temperature: Thermistor |
| Output |
Serial TTL, 3.6 Volt Levels or SDI-12 (contact Decagon for
information on SDI-12 mode) |
| Operating Environment |
-40°C to 50°C |
| Power |
3.6-15 VDC, 0.3mA quiescent, 25 mA during 150ms
measurement |
| Cable Length |
5m, custom cable lengths available upon request |
| Cable Connector Types |
3.5mm stereo jack plug or stripped and tinned lead wires
(3) |
| Sensor Dimensions |
9.3 x 2.4 x 6.5cm |
| Data Logger Compatibility (not exclusive) |
Decagon: Em50, Em50R, Em50G, ProCheck
Campbell Scientific: CR200X - series, CR800/CR850, CR1000, CR3000,
CR9000X
Other: Any data acquisition system capable of 3.6-15V excitation
and serial or SDI-12 communication |
| Warranty |
One year, parts and labour |
Reasons to pick the GS3:
- If you need to measure VWC, EC, and temperature in soilless
substrates
- If you are managing salts in your system
- If you want to use SDI-12
Click here for the Soil Sensors Comparison
Page.
Download the Instruction booklet:
GS3
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