RXW-GP3A-900
•RXW-GP3A-922
•RXW-GP3A-868
•RXW-GP3A-921
•RXW-GP4A-900
•RXW-GP4A-922
•RXW-GP4A-868
•RXW-GP4A-921
•RXW-GP6A-900
•RXW-GP6A-922
•RXW-GP6A-868
•RXW-GP6A-921
HOBOnet Multi-Depth Soil Moisture Sensor
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.
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
Specifications
| 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 |
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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-GPxA-900: 904–924 MHz RXW-GPxA-868: 866.5 MHz RXW-GPxA-921: 921 MHz RXW-GPxA-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: 5 minutes year round when using solar power with rechargeable batteries, 10 minutes when using non-rechargeable lithium batteries |
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| Number of Data Channels | RXW-GP3A-xxx: 10 RXW-GP4A-xxx: 11 RXW-GP6A-xxx: 16 |
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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: 1 year with a 10-minute logging interval |
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| 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) |
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| 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) |
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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.
Compatible items
Mounting Accessories
Batteries
Web-based Monitoring Systems - via remote communication
Communications
What's in the box
- HOBOnet Multi-Depth Soil Moisture Sensor
- Two AA 1.2V rechargeable NiMH batteries
- Cable ties
- Screws
Resources
FAQs
For fast and easy installation, with minimal soil disturbance, a pilot rod and slide hammer may be used. An auger may also be used to create a hole for the soil moisture probe. Consult the user manual (in the documentation tab) for more details.
These sensors come factory-calibrated for use in most soils. They can, however, be calibrated for specific soils.
The GroPoint user manual provides instructions on how to perform soil-specific calibration using a GP-USB Connect SDI-12 programming tool (available from https://www.gropoint.com/). Refer to Appendix A of the GroPoint manual, available at https://www.gropoint.com/products/soil-sensors/gropoint-profile/ from the Downloads tab.
These sensors are intended to have the top of the probe near the surface of the soil with the length of the probe determining the lowest depth of the soil moisture and temperature points.
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