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Cellular

GOES

900MHz

Teledesign TS4000 900MHz UHF/VHF

eTracker
True cloud-based sensor configuration, logging, reporting and data analysis all-in-one.

Bluetooth

Shark (RS232/RS485 Bluetooth Serial Adapter)

Software

Stevens-Connect
A cloud-based interface to configure hardware, visualize data, analyze measurements, manage alarms, calculations, and set up data routing.


MEASUREMENTS TO MIND (M2M) is a growing suite of Stevens products that embraces cloud-computing with an all-inclusive vision of shortening the communication path from the sensors to data on-line. That is, what the sensors MEASURE the MIND sees.


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Power

SOLO (smart SDI-12 power manager)
JL-2 (solar charge controller)
Batteries
Power Supplies
Solar Panels

SOLO
Smart SDI-12 power manager that also provides remote power cycling.


The product finder lets you explore our catalog visually and filter products by type of monitoring, manufacturer, and more.


The product finder lets you explore our catalog visually and filter products by type of monitoring, manufacturer, and more.


Stevens GroPoint Profile

Multi-Segment Soil Moisture Profiling Probe

gropoint profile moisture sensor

The Stevens 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).

An Accurate and Cost-Effective Soil Profiling Solution

Eliminates need for multiple sensors and cabling systems.

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.

Simplify Measurement of Soil Moisture at Multiple Depths

This single GroPoint Profile probe installed without excavation is equivalent to 4 separate probes. It will measure soil moisture at 4 different depths.

My Image

Segment 1

Average volumetric soil moisture content measured over 15cm (5.9”)

My Image

Segment 2

My Image

Segment 3

My Image

Segment 4

Analyze

water

movement

through

the soil.

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Create a pilot hole the exact size required for the probe using the slide hammer tool attached to a sturdy steel pilot rod. This makes installation quick and easy, and provides minimum soil disruption, further increasing measurement accuracy.

Slide hammer
Pilot rod

2

3

4

5

6

Choose the number of segments that’s right for your application.

(Custom sizes also available)

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

GroPoint profile no temperature sensors

4-segments, no temperature sensors

GroPoint profile standard temperature sensor configuration

4-segments, standard temperature sensor configuration

GroPoint profile scientific temperature sensor configuration

4-segments, scientific temperature sensor configuration

TDT5

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:

1. Extreme accuracy


A 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. It's like having a 75cm long antenna in a single 15cm sensor. A larger antenna increases the resolution of each sample, allowing more noise to be filtered out, improving the accuracy to ±1% (between 8% to 42% VMC).


2. Reduced manufacturing costs


Unlike other moisture probes, Gropoint sensors do not have separate components for electronics and bulky metal antennas. By integrating the antenna and all electronics into the same circuit board (possible thanks to the patented antenna design), manufacturing costs are dramatically reduced.


3. Repeatable accuracy


Each time a measurement is taken, GroPoint sends 400,000 pulses through the sensing element to generate data for the measurement, then employs advanced filtering to eliminate outlying readings (noise) before averaging the data and sending the measurement as SDI-12 output. This ensures that the same extreme accuracy (±1%) is obtained each and every time moisture is measured.


4. Low power consumption


Despite 400,000 pulses for each measurement, the total time to take the measurement is less than 100 ms. This means that power consumption is minimal, and that permits GroPoint sensors to be operated for many months with small 9V battery-powered data loggers.


5. Maximum durability


Unlike typical sensors, the antenna is not exposed to the soil, so there's nothing to bend or break. The entire sensor circuit board is sealed in epoxy then encased in a sealed polycarbonate housing.

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What's the Easiest and Quickest Way to Start Collecting Data and Access it Anywhere?

The Answer's in the Cloud.

eTracker is a cellular modem and "virtual" cloud-based data logger in one (meaning you don't need to install a separate data logger). Simply connect your sensor and a power source to eTracker and you're done. Configure (or reconfigure) anytime from any Internet-connected device, and use Stevens-Connect to retrieve your data, or forward it to your favorite software system.

Technical Specifications

Moisture

Measurement range

0% to 100% of VMC

Accuracy

±1.0% *

Precision

< 0.2%

Temperature

Measurement range

-20°C to +70°C (-4°F to 158°F)

Storage temperature

-40°C to 85°C (-40°F to 185°F)

Accuracy

±0.5°C

Electrical

Output

SDI-12 V1.3 (RS485 optional)

Connection

Bare wire (optional 4 pin, IP66/IP68 rated environmental connector)

Input voltage

6 to 14 VDC max. 18 VDC

Current consumption

Quiescent: <0.5mA
Active: 15-20 mA (depending on number of segments) for 100 mS

Warm-up time on power up

< 1 second

Physical

Length

Each 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 weight

2 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 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.