GroPoint Profile

Multi-segment soil moisture and temperature profiling probe

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

  • Soil moisture profiling probe
  • Optional temperature measurement
  • SDI-12 interface
  • 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.
  • Sensor can be custom calibrated by the customer—see detailed procedure in the User Manual.

Videos

Introduction to GroPoint Profile

A brief introduction to the GroPoint profile.

How to Install the GroPoint Profile

Here’s a detailed look at the process of installing a GroPoint Profile soil sensor. It’s not difficult (especially because there’s no excavation required) but we show you several tips and tricks for making your installation as smooth as possible so you can ensure you get high accuracy.

Measuring Across the Entire Probe Length

In this video we discuss a unique aspect of the Gropoint Profile and how it contributes to greater accuracy by minimizing the effect of rocks, air pockets, and different soil horizons that are in the measurement area.

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

Why is it the Best Profiling Probe for Irrigation Optimization?

GroPoint Profile is the only soil moisture probe that measures the entire volumetric moisture content surrounding the

Imagine this is the soil we want to measure for moisture content, from the surface to a depth of about 42 cm.

Like most soil, it's not completely uniform, with objects like this buried rock, air gaps from rodent tunnels and other things that affect moisture in the soil.

Throughout the soil horizons, there are also varying degrees of porosity and different soil densities.

GroPoint Profile

3-segment probe

45cm long

Other profiling probe

4 sensors every 10 cm

40cm long

The sensors of typical profiling probes measure only at that point.

The GroPoint profile's sensor segments measure the entire length of each segment (and therefore the entire probe length).

This sensor will measure less moisture than there actually is because the rock consumes a large portion of the sensor's measurement area.

The rock will have minimal impact on the GroPoint Profile's measurements.
WHY?
Because the soil moisture content across the full 15cm length of each segment is measured and averaged.

More precision,

How does it work?

GroPoint™ sensors are based on the field-proven Time Domain Transmission (TDT) method of reliably measuring soil moisture, which is a refined version of Time Domain Reflectometry (TDR).

TDT-based sensors do not need to be calibrated to each type of soil they will be buried in to deliver excellent accuracy and stability, however we do calibrate for 3 specific soil types for even greater accuracy.

TDT5 enhances TDT in 5 key ways.

Download the Product Catalog

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Download the product catalog here.