Stevens GroPoint Profile

Multi-segment soil profiling sensor

GroPoint™ Profile provides cost-effective measurement of volumetric water content over multiple depths using a single probe, eliminating the cumbersome excavation required for multiple sensors placed at different depths. It can be deployed in irrigation-sensitive zones to enable full control of precision irrigation needs, providing an understanding of water movement through the soil.

The sleek, lightweight design installs quickly with minimal soil disruption using a pilot rod and slide hammer tool. Designed for vertical installation, the sensor takes measurements over multiple soil layers, with each measurement zone (segment) providing the average volumetric soil moisture content over a 15 cm range (approximately 6 inches).

Unlike any other soil profiling probe, GroPoint Profile provides true soil profiling quantification, measuring the average moisture across the entire length of each segment (15cm or 6″), because there are no gaps between segments. This unique feature allows measuring the water movement through the soil continuously, rather than just at discrete positions on the probe.

The Most Accurate and Cost-Effective Soil Profiling Solution Available

  • Eliminates need for multiple sensors and cabling systems.
  • Measures across the entire length of the probe, averaging the soil moisture and temperature in each segment
  • Installs quickly and easily without excavating.
  • One SDI-12 address is used to read all segments, providing for simplified installations. Optional RS-485 output.
  • 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.

Configurations

GroPoint Profile is available in six different multi-segment lengths, suitable for a wide range of agricultural crop monitoring.

You can also choose from two different configurations for temperature sensors, depending on your requirements. You can configure it with no temperature sensors if you only require moisture measurement, or the standard configuration places temperature sensors every 1 or 2 segments.

Choose the number of 15 cm (6″) segments that are right for your application. Custom lengths also available.

2
3
4
5
6
8

x segments

Installing a GroPoint Profile probe is quick and easy with no excavation required. Attach the slide hammer to the sturdy steel pilot rod.

Slide the top segment of the slide hammer up as much as it goes, then down forcefully. It will strike the bottom segment and drive the attached pilot rod into the soil.

The hole will be the exact size of the probe, so not only is there minimal disruption to the surrounding soil, there will be no air gaps between the probe and the undisturbed soil. This clever design further increases measurement accuracy.

The slide hammer is used to extract the pilot rod again, with a couple of quick upward movements (like hammering in reverse).

This single 4-segment probe is equivalent to 4 separate probes, each measuring the average moisture across 15cm (6"). Soil moisture is measured at 4 different depths simultaneously.

Each segment averages the volumetric moisture content measured over 15 cm (6"). Together, the range covered is the length of the entire probe, with no gaps between.

Analyze water movement
through the soil

Download the Stevens Soil Resource Guide

Written by the soil experts at Stevens, our soil resource guide contains a wealth of information and will benefit anyone involved with soil. Whether you’re a soil scientist, a farmer or a soil researcher, this 52 page book is a fantastic reference and source of up-to-date theories, practices and advice. 

Inside:

Soil Geomorphology

Soil Properties

Salinity / Electrical Conductivity (EC)

Dielectric Permittivity

Soil Monitoring Applications

Soil Moisture and Irrigation

Soil Sensor Technologies

Soil Sensor Calibration

Sensor Accuracy

…and much more!

Soil Resource Guide Download
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Technical Specifications

Moisture

Measurement range8% to 40% of VWC
Accuracy2% to 5% for most soils, accuracy depends on soil
Repeatability<0.2%

Temperature

Measurement range-20°C to +70°C (-4°F to 158°F)
Accuracy±0.5°C

Electrical

OutputSDI-12 V1.3 (RS485 optional)
ConnectionBare wire (optional 4 pin, IP66/IP68 rated environmental connector)
Input voltage6 to 14 VDC max. 18 VDC
Current consumptionQuiescent: <0.5mA
Active: 15-20 mA (depending on number of segments) for 100 mS
Warm-up time on power up<1 second

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

LengthEach segment is approximately 15 cm (5.9") long. Total length is the number of segments multiplied by 15 cm. For example, a 3-segment probe is about 45cm long.
Probe weight2 segments: 292 g (10.3 oz.)
3 segments: 351 g (12.4 oz.)
4 segments: 408 g (14.4 oz.)
5 segments: 468 g (16.5 oz.)
6 segments: 526 g (18.6 oz.)
8 segments: 642 g (22.6 oz.)
Cable weight38 g per m (0.42 oz. per foot)
Standard cable5 m (16.3 ft.)
4xAWG22 dual-shielded, twisted pair, rated for direct burial
Warranty1-year limited parts and labor

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