GroPoint - Model Pro - Soil Moisture, Temperature, Salinity (EC) and Wetting-Front Sensor
From Soil Moisture Profile - Probes and Sensors
The GroPoint™ Pro soil sensor is robust, reliable and highly accurate. It provides a cost-effective solution for measuring soil moisture, soil temperature, and salinity (electrical conductivity or EC). This SDI-12 soil moisture sensor also functions as a wetting front detector, providing a separate output for the wetting front measurement. By placing the tip of the soil sensor just above the bottom of the crop’s root zone, the wetting front sensor will indicate when the water has reached the bottom of the soil sensor. This allows irrigation to stop precisely at the right time to ensure only the water needed is applied.
Product Details
The sleek, lightweight design installs quickly with minimal soil disruption. When installed vertically, the soil probe averages volumetric water content over a soil layer of about 6” (15cm). When installed horizontally, the soil sensor can measure soil moisture at a specific depth.
GroPoint™ Pro can be deployed in sensitive agriculture zones to enable full control of irrigation, increase water-use efficiency and provide an understanding of water movement throughout the soil.
- Provides SDI-12 output of soil moisture,soil temperature and salinity (electrical conductivity).
- Detects when wetting front has reached bottom of probe.
- Soil moisture readings can be user-calibrated with 3rd-order polynomials to meet custom requirements.
- Low power requirements—suitable for remote, autonomous applications.
- Patented TDT5 technology for scientific-grade accuracy and excellent long-term stability of measurements.
- Fully potted electronics for excellent durability.
Features
- Soil moisture sensor that measures the average volumetric water content
- Measures the soil temperature and electrical conductivity (EC)
- Soil moisture sensor can function as a wetting front detector
- Based on our unique TDT5 technology.
- Comes with 5 m (16.4') durable cable (4-pin IP68-rated EN3 connector optional).
- Factory-calibrated for most agricultural soils, but can be custom calibrated before shipping—request when ordering.
- Can be custom calibrated by the customer—see the detailed procedure in the User Manual.
Technical Specifications
Moisture
Moisture:
- Measurement range: 0% to 100% of VMC
- Accuracy: ±2.0% *
- Precision: < 0.2%
Electrical conductivity/Salinity:
- Measurement range: 0 to 4 dS/m
- Accuracy: ±3%
Temperature:
- Measurement range: -20°C to +70°C (-4°F to 158°F)
- Accuracy: ±0.5°C
Wetting Front:
- Output parameter: 0 to 10, corresponding to rate of change of moisture from last reading
Electrical:
- Interface: SDI-12 v.1.3
- Connection: Bare wire (optional En3 4 pin, IP66/IP68 rated environmental connector)
- Input voltage: 6 to 14 VDC max. 18 VDC
- Current consumption: Quiescent: Active: 15-35 mA
- Warm-up time on power up:
Environmental:
- Operating temperature: -20°C to 70°C (-4°F to 158°F)
- Storage temperature: -40°C to 85°C (-40°F to 185°F)Physical
Physical:
Dimensions:
- 19.6 cm x 2.0 cm x 0.56 cm (7.7” x 0.8” x 0.2”)
- Weight (with standard cable): 272 g (0.6 lb.)
- Cable weight: 38 g per m (0.42 oz. per foot)
- Standard cable: 5 m (16.3 ft.)4xAWG22 dual-shielded, twisted pair, rated for direct burial
- Warranty: 1-year limited parts and labour
* 8% to 42% VMC, in controlled laboratory conditions; factory calibrated for most agricultural soils. In field applications, accuracy may slightly decrease due to the inevitable heterogeneity of soil texture, soil compaction, moisture and fluctuation in soil temperature. The accuracy may also decrease in difficult soil conditions (higher clay and salinity content). In normal conditions, GroPoint sensors will maintain their accuracy from permanent wilting through field capacity in sandy loam through clay soils with less than 60% clay particles. Under moderately saline conditions. GroPoint sensors will maintain their accuracy up to 6 ds/m.
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