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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 quick 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.
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 probe lengths, for measurements up to 90 cm (35 inches) 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 is wireless, you can deploy a network of sensors to easily monitor multiple points with a single system, 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
| Specification | Details |
|---|---|
| Measuring Range (Soil Moisture) | In soil: 0 to 0.550 m³/m³ (volumetric water content) |
| Accuracy | ±0.02 m³/m³ (±2%) in most typical soils from 0° to 50°C (32° to 122°F) |
| Resolution | 0.001 m³/m³ |
| Measuring Range (Temperature) | -20° to 70°C (-4° to 158°F) |
| Accuracy | ±0.5°C (0.9°F) |
| Resolution | 0.1°C (0.18°F) |
| Measured Depths (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 |
| 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 up to 457.2 m (1,500 feet) line of sight at 1.8 m (6 feet) height Reliable connection up to 609.6 m (2,000 feet) line of sight at 3 m (10 feet) height |
| 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 Used | 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 a HOBO RX station |
| Recording Rate | Maximum recording interval: 18 hours Minimum recommended recording 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 |
| Battery Type/Power Source | Two AA 1.2V rechargeable NiMH batteries, powered by an integrated solar panel or two AA 1.5 V non-rechargeable lithium batteries for operating conditions from -40 to 70°C (-40 to 158°F) |
| Battery Life | With NiMH batteries: Typically 3–5 years when operated in the temperature range of -20 ° to 40°C (-4°F to 104°F) and positioned toward the sun (see Mote Mounting and Positioning), operation outside this range will reduce battery life With non-rechargeable lithium batteries: 1 year with a 10-minute recording interval |
| Memory | 16 MB |
| Dimensions | Sensor length RXW-GP3A-xxx: 53.2 cm (20.9 inches) Sensor length RXW-GP4A-xxx: 68.2 cm (26.9 inches) Sensor length RXW-GP6A-xxx: 98.2 cm (38.7 inches) Sensor diameter: 3 cm (1.2 inches) Cable length: 3.5 m (11 feet 6 inches) Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches) |
| Weight | Sensor RXW-GP3A-xxx: 351 g (12.4 oz) Sensor RXW-GP4A-xxx: 408 g (14.4 oz) Sensor RXW-GP6A-xxx: 526 g (18.6 oz) Cable: 180 g (6.5 oz) Mote: 226 g (7.97 oz) |
| Materials | Sensor: Polycarbonate housing enclosing the epoxy-sealed circuit board Cable: Polyurethane Mote: PCPBT, silicone rubber seal |
| Environmental Rating | Mote: IP67, NEMA 6 |
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