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HOBOnet Multi-Depth Soil Moisture Sensor

An award-winning wireless sensor that works with the HOBOnet system to measure soil moisture and soil temperature at multiple depths with a single probe, for fast and easy installation.

Important Information

A complete system requires at least one HOBO RX3000 Remote Monitoring Station, a HOBOnet Wireless Manager, and a HOBOnet Wireless Sensor, OR one HOBO MicroRX Station (which has an integrated HOBOnet Wireless Manager) and a HOBOnet Wireless Sensor. HOBOnet Wireless Repeaters (RXW-RPTR-xxx or RXW-RPTR-B-xxx) can be added to extend the range.

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SKU

RXW-GPxA

Details

Technische Daten

Datenblatt

Kompatible Artikel

Overview

An award-winning wireless sensor that works with the HOBOnet system to measure soil moisture and soil temperature at multiple depths with a single probe for fast and easy installation. This durable sensor is available in three probes lengths, for measurements up to 90 cm (35 in) deep.

Featuring GroPoint's TDT5 technology with patented antenna design, this sensor measures soil moisture along the entire length of each probe segment, resulting in the largest volume of influence per measurement section. A high frequency of pulses per measurement provides precise and consistent soil moisture data.

We recommend using the optional pilot rod and slide hammer for quick and easy installation: the PILOT-ROD4 (28") for use with the 3-segment and 4-segment sensors (RXW-GP3A and RXW-GP4A) and the PILOT-ROD6 (40") for use with the 6-segment sensor (RXW-GP6A).

The HOBOnet system is a cost-effective and scalable wireless sensor network for web-enabled monitoring of field conditions for applications such as crop management, research, and greenhouse operations. And because it's wireless, you can deploy a network of sensors to easily monitor multiple points with a single system, while avoiding the risk of long cables that can interfere with field operations. Sensors are easily linked to the network, and data can be accessed through HOBOlink, Onset's innovative cloud software platform.

Features

Sensor Features

Available in three probe lengths: 45 cm (18 in), 60 cm (24 in), and 90 cm (35 in)
Soil moisture measurements over entire probe segment lengths
Soil temperature measurements at multiple points
Largest volume of influence per measurement (2 L volume of influence per 15 cm segment)
Advanced filtering of 400,000 pulses per measurement eliminates outlying readings and provides precise, repeatable soil moisture data
Polycarbonate housing and epoxy-sealed circuit board protect vital components during installation and throughout deployment
Easy installation with minimal soil disturbance, and no digging required when using the optional pilot rod and slide hammer

Wireless Features

Sub-GHz wireless mesh self-healing technology
450 to 600 meter (1,500 to 2,000 feet) wireless range and up to five hops
Up to 50 wireless sensors or 336 data channels per one HOBO RX station
Simple button-push to join the HOBOnet wireless network
Onboard memory to ensure no data loss
Powered by rechargeable AA batteries and built-in solar panel

What's in the box

HOBOnet Multi-Depth Soil Moisture Sensor
Two AA 1.2V rechargeable NiMH batteries
Cable ties
Screws

Specifications

Measurement Range

In soil: 0 to 0.550 m³/m³ (volumetric water content)

Accuracy

±0.02 m³/m³ (±2%) in most soils typical from 0° to 50°C (32° to 122°F)*

Resolution

0.001 m³/m³

Measurement Range

-20° to 70°C (-4° to 158°F)

Accuracy

±0.5°C (0.9°F)

Resolution

0.1°C (0.18°F)

RXW-GP3A-xxx

45 cm (18 inches) total; three soil moisture zones, six temperature depths

RXW-GP4A-xxx

60 cm (24 inches) total; four soil moisture zones, six temperature depths

RXW-GP6A-xxx

90 cm (35 inches) total; six soil moisture zones, nine temperature depths

Operating Temperature Range

Sensor: -20° to 70°C (-4° to 158°F)
Mote: -25° to 60°C (-13° to 140°F) with rechargeable batteries
-40° to 70°C (-40° to 158°F) with lithium batteries

Radio Power

12.6 mW (+11 dBm) non-adjustable

Transmission Range

Reliable connection to 457.2 m (1,500 ft) line of sight at 1.8 m (6 ft) high
Reliable connection to 609.6 m (2,000 ft) line of sight at 3 m (10 ft) high

Wireless Data Standard

IEEE 802.15.4

Radio Operating Frequencies

RXW-GPxA-900: 904–924 MHz
RXW-GPxA-868: 866.5 MHz
RXW-GPxA-921: 921 MHz
RXW-GPxA-922: 916–924 MHz

Modulation Employed

OQPSK (Offset Quadrature Phase Shift Keying)

Data Rate

Up to 250 kbps, non-adjustable

Duty Cycle

<1%

Maximum Number of Motes

Up to 50 wireless sensors or 336 data channels per one HOBO RX station

Logging Rate

Maximum logging interval: 18 hours
Recommended minimum logging interval: 5 minutes year round when using solar power with rechargeable batteries, 10 minutes when using non-rechargeable lithium batteries

Number of Data Channels

RXW-GP3A-xxx: 10
RXW-GP4A-xxx: 11
RXW-GP6A-xxx: 16

Battery Type/
Power Source

Two AA 1.2V rechargeable NiMH batteries, powered by built-in solar panel or two AA 1.5 V non-rechargeable lithium batteries for operating conditions of -40 to 70°C (-40 to 158°F)

Battery Life

With NiMH batteries: Typical 3–5 years when operated in the temperature range -20° to 40°C (-4°F to 104°F) and positioned toward the sun (see Mounting and Positioning the Mote), operation outside this range will reduce the battery service life
With non-rechargeable lithium batteries: 1 year with a 10-minute logging interval

Memory

16 MB

Dimensions

RXW-GP3A-xxx sensor length: 53.2 cm (20.9 inches)
RXW-GP4A-xxx sensor length: 68.2 cm (26.9 inches)
RXW-GP6A-xxx sensor length: 98.2 cm (38.7 inches)
Sensor diameter: 3 cm (1.2 inches)
Cable length: 3.5 m (11 ft 6 in)
Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches)

Weight

RXW-GP3A-xxx sensor: 351 g (12.4 oz)
RXW-GP4A-xxx sensor: 408 g (14.4 oz)
RXW-GP6A-xxx sensor: 526 g (18.6 oz)
Cable: 180 g (6.5 oz)
Mote: 226 g (7.97 oz)

Materials

Sensor: Polycarbonate housing encasing epoxy sealed circuit board
Cable: Polyurethane
Mote: PCPBT, silicone rubber seal

Environmental Rating

Mote: IP67, NEMA 6

*Soil-specific calibration requires user post-processing in a spreadsheet program such as Microsoft® Excel® or a utility and connector as recommend by RioT Technology Corp., manufacturer of GroPoint sensors. Refer to "Performing a Soil-Specific Calibration" in the manual for details.