Onset HOBOnet Wireless Multi-Depth Soil Moisture Sensor
Features
- 900 MHz 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 HOBO RX station
- Free ground shipping
- Expedited repair and warranty service
- Lifetime technical support
- More
Overview
The Onset HOBOnet Multi-Depth Soil Moisture Sensor is a wireless sensor that works with the HOBOnet system to measure soil moisture and soil temperature at multiple depths with a single probe. This durable sensor is available in three probe lengths, for measurements up to 90 cm (35 in) deep.
Mechanics
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.
Applications
The optional pilot rod and slide hammer are recommended 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. Because it's wireless, users 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.
| Soil Moisture: Volumetric Water Content (VWC) | ||||||||||||||||||||||||||
| 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 | |||||||||||||||||||||||||
| Temperature | ||||||||||||||||||||||||||
| Measurement Range | -20° to 70°C (-4° to 158°F) | |||||||||||||||||||||||||
| Accuracy | ±0.5°C (0.9°F) | |||||||||||||||||||||||||
| Resolution | 0.1°C (0.18°F) | |||||||||||||||||||||||||
| Depths Measured (see below) | ||||||||||||||||||||||||||
| 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 | |||||||||||||||||||||||||
| Wireless Mote | ||||||||||||||||||||||||||
| 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 | |||||||||||||||||||||||||
- HOBOnet Multi-Depth Soil Moisture Sensor
- Two AA 1.2V rechargeable NiMH batteries
- Cable ties
- Screws
Select Options
In The News
Climate Change and Microplastics: Monitoring Lake Champlain
Most people go to Lake Champlain for its exceptional views and thrilling boating, but it’s also home to a wide variety of interesting aquatic research projects. From studying microplastics to thermal dynamics of the lake, Timothy Mihuc, director of the Lake Champlain Research Institute (LCRI) at the State University of New York at Plattsburgh (SUNY Plattsburgh), has spent his career studying aquatic ecosystems. As an aquatic biologist, he’s the main investigator on Lake Champlain’s research studies while also managing their grants, employees, and their hands-on buoy work. Over the years, LCRI has received a number of environmental grants that aid in its monitoring research.
Read More
Current Monitoring after the Francis Scott Key Bridge Collapse
On March 26th, according to The Baltimore Sun , a 984-foot, 112,000-ton Dali lost propulsion and collided with a support column of the Francis Scott Key Bridge, collapsing the structure. Soon after the event, search and rescue, salvage crews, and other emergency responders were mobilized after the collision. As salvage efforts progressed in early April, NOAA’s Center for Operational Oceanographic Products and Services (CO-OPS) responded to a request for real-time tidal currents data and deployed a current monitoring buoy—CURBY (Currents Real-time BuoY)—into the Patapsco River north of the Francis Scott Key Bridge.
Read More
Soundscapes of the Solar Eclipse: Citizen Science Supporting National Research
On April 8, 2024, millions of people around the world had their eyes glued to the sky to witness a historic cosmic event. The total solar eclipse captured the headlines and the minds of many who became eager to gaze at the heavens as the sky went dark for a few minutes. However, not everyone used their sense of sight during the eclipse, some were listening to the sounds of the natural world around them as the light faded from above. The Eclipse Soundscape Project is a NASA-funded citizen science project that focuses on studying how the annular solar eclipse on October 14, 2023, and the April 8, 2024 total solar eclipse impacted life on Earth. The project revisits an initiative from the 1930s that showed animals and insects are affected by solar eclipses.
Read More
