Soil Moisture Measurement

RioT designs and manufactures world-class soil moisture monitoring equipment under the GroPoint™ brand. With thousands of sensors in use around the world, GroPoint is known for high accuracy, extreme durability and an exceptional price:performance ratio with our soil sensors performing as good (in most cases better) as sensors costing much more.

Serving agricultural, scientific, industrial and a variety of vertical markets, our product suite includes both fixed depth and profiling soil moisture and temperature sensors, plus simple data logging and data retrieval devices.

TDT5: GroPoint's patented technique for soil moisture measurement

  • scientific-grade accuracy and consistency of measurements
  • simpler construction—more robust
  • less expensive to manufacture—better value

GroPoint™ sensors utilize the field-proven Time Domain Transmission (TDT) method of reliably measuring soil moisture, which is a refined version of the Time Domain Reflectometry (TDR) technique. TDT-based sensors do not need for be calibrated to each type of soil they will be buried in.

Our proprietary TDT5 technology further enhances TDT in five key ways:

  1. Measures with a patented antenna woven into the full length of the internal circuitry – reduces the impact of noise to achieve a high accuracy and averages measurements across the entire length of the probe 
  2. Averages 400,000 samples for each measurement – boosts accuracy to ±1% and repeatability to < 0.2%
  3. Captures measurement in less than 100ms – reduces power consumption
  4. Embeds antenna and circuitry on a single board – dramatically reduces cost to manufacture
  5. Encases entire sensor in a durable, sealed engineered resin housing – maximizes durability

The GroPoint Profile represents true innovation, with a design that allows for multiple simultaneous moisture readings at different depths with a single probe. It’s also the only probe of its kind that averages readings across each segment and does not require augured holes or installation of access tubes. Its low price point allows multiple sensors to remain permanently installed for ongoing soil profile monitoring.

The GroPoint Profile represents true innovation, with a design that allows for multiple simultaneous moisture readings at different depths with a single probe. It’s also the only probe of its kind that averages readings across each segment and does not require augured holes or installation of access tubes. Its low price point allows multiple sensors to remain permanently installed for ongoing soil profile monitoring.

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Antenna length (each side): 15cm
Effective length (if stretched out): 75cm

The Patented GroPoint Antenna

The antenna design is another key to producing robust sensors with such high accuracy at such a low price. Our patented design weaves the antenna through the circuit board 20 times per centimetre, and much like a coiled spring the effective length of the antenna is 5 times the physical length it consumes. A larger antenna increases the resolution of each sample, allowing more noise to be filtered out, and ultimately increasing the accuracy and the precision of measurements. GroPoint sensors based on this technology deliver scientific-grade measurement for less than the price of most competing probes.