HOBOnet Multi-Depth Soil Moisture Sensor
Overview
The 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, for fast and easy installation. This durable sensor is available in three probe lengths for measurements from 45 cm (18 in) to 90 cm (35 in) deep.
Featuring GroPoint’s TDT5 technology with patented antenna design, these sensors measure 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. Onset offers two options for the pilot rod, the PILOT-ROD4 (28”) for use with the three- and four-segment sensors (RXW-GP3 and RXW-GP4), and the PILOT-ROD6 (40”) for use with the six-segment sensor (RXW-GP6).
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-based software platform.
Manufactured by: Onset
Model: HOBOnet Multi-Depth Soil Moisture Sensor
Services offered for this product
- Sales
- Rental
- Installation
- Calibration
- Maintenance
- IoT Cloud Compatible
Applications
Soil moisture
Soil temperature
Specification
| Soil Moisture: Volumetric Water Content (VWC) | |||
| Measurement Range | 0.000 to 1.000 m3/m3 in most soils | ||
| 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-GP3-xxx | 45 cm (18 inches) total; three soil moisture zones, six temperature depths | ||
| RXW-GP4-xxx | 60 cm (24 inches) total; four soil moisture zones, seven temperature depths | ||
| RXW-GP6-xxx | 90 cm (35 inches) total; six soil moisture zones, eleven 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 |
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| 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 |
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| Wireless Data Standard | IEEE 802.15.4 | ||
| Radio Operating Frequencies | RXW-GPx-900: 904–924 MHz RXW-GPx-868: 866.5 MHz RXW-GPx-921: 921 MHz RXW-GPx-922: 916–924 MHz |
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| 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: |
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| Using Solar Power with Rechargeable Batteries | Using Non-Rechargeable Lithium Batteries | ||
| RXW-GP3-xxx: | 5 minutes year round | 10 minutes | |
| RXW-GP4-xxx: | 5 minutes summer, 10 minutes winter | 15 minutes | |
| RXW-GP6-xxx: | 5 minutes summer, 10 minutes winter | 15 minutes | |
| Number of Data Channels | RXW-GP3-xxx: 10 RXW-GP4-xxx: 12 RXW-GP6-xxx: 18 |
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| 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: RXW-GP3-xxx: 1 year with a 10-minute logging interval RXW-GP4-xxx: 1 year with a 15-minute logging interval RXW-GP6-xxx: 7 months with a 15-minute logging interval |
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| Memory | 16 MB | ||
| Dimensions | RXW-GP3-xxx sensor length: 53.2 cm (20.9 inches) RXW-GP4-xxx sensor length: 68.2 cm (26.9 inches) RXW-GP6-xxx sensor length: 98.2 cm (38.7 inches) Sensor diameter: 3 cm (1.2 inches) Cable length: 3 m (9.8 ft) Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches) |
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| Weight | RXW-GP3-xxx sensor: 351 g (12.4 oz) RXW-GP4-xxx sensor: 408 g (14.4 oz) RXW-GP6-xxx sensor: 526 g (18.6 oz) Cable: 190 g (6.7 oz) Mote: 223 g (7.87 oz) |
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| Materials | Sensor: Polycarbonate housing encasing epoxy sealed circuit board Cable: Polyurethane Mote: PCPBT, silicone rubber seal |
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| 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. | |||
