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    HOBOnet Multi-Depth Soil Moisture Sensor

    Manufacturer:
    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.
    Part Number: RXW-GPx-922
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    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). This is the best and easiest method for installation however does come at a high cost. This would tool would be ideal if you have many sensors to deploy. 

    We also recommend using Australian made Dormer Soil Augers to create a suitable hole for the soil sensor. OneTemp can supply a suitable auger for your soil type if required. This method will require a soil slurry method to backfill the hole around the sensor.

    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.

    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.

    Wireless 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 per 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

    In what environment does this operate?

    This operates in an outdoor environment.

    What measurements does this support?

    The supports the following measurements: Soil Moisture and Soil Temperature

    What's in the Box?

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

    The country of origin for this product is the United States.

    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
    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-GPx-900: 904–924 MHz
    RXW-GPx-868: 866.5 MHz
    RXW-GPx-921: 921 MHz
    RXW-GPx-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:
      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
    See Battery Life specification for more details.
    Number of Data Channels RXW-GP3-xxx: 10
    RXW-GP4-xxx: 12
    RXW-GP6-xxx: 18    		  
    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
    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)
    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)
    Materials Sensor: Polycarbonate housing encasing epoxy sealed circuit board
    Cable: Polyurethane
    Mote: PCPBT, silicone rubber seal
    Environmental Rating Mote: IP67, NEMA 6
    Compliance Marks* FCC Logo CE Compliant Australia/New Zealand General Compliance mark Taiwan NCC Mark

    *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.

    Q. How are these sensors installed? Do I need any special tools?
    A. 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.


    Q. Is calibration required for different soil types?
    A. These sensors come factory-calibrated for use in most soils. They can, however, be calibrated for specific soils.


    Q. How do I calibrate for specific soil types?
    A. 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.


    Q. How deep in the soil should these sensors be placed?
    A. 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.

    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). This is the best and easiest method for installation however does come at a high cost. This would tool would be ideal if you have many sensors to deploy. 

    We also recommend using Australian made Dormer Soil Augers to create a suitable hole for the soil sensor. OneTemp can supply a suitable auger for your soil type if required. This method will require a soil slurry method to backfill the hole around the sensor.

    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.

    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.

    Wireless 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 per 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

    In what environment does this operate?

    This operates in an outdoor environment.

    What measurements does this support?

    The supports the following measurements: Soil Moisture and Soil Temperature

    What's in the Box?

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