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  • RXW-T12-xxx
  • RXW-T12-xxx
  • RXW-T12-xxx
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HOBOnet T12 Soil Moisture/Temp/EC Sensor

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Overview

The HOBOnet T12 is a wireless sensor that works with the HOBOnet system to not only provide advanced soil moisture measurements (volumetric water content) with better accuracy and precision, but also measure soil temperature and electrical conductivity. Designed to withstand harsh environmental conditions, these durable sensors last up to 10 years, so you can leave them in the field for extended periods of time. Sharpened stainless-steel probe tips make installation easy, even in hard soil, and a large volume of influence provides more accurate results. Featuring the METER TEROS 12 soil moisture and temperature sensor, the HOBOnet T12 is backed by over 20 years of soil-moisture research and leverages METER’s trademark 70MHz frequency capacitance technology, minimizing salinity and textural effects. 

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 and are potentially vulnerable to nearby lightning strikes.

Sensors are easily linked to the network, and data can be accessed through HOBOlink®, Onset's innovative cloud-based software platform.

We recommend using the TEROS Verification Clip, available from the Compatible Items tab, below. The TEROS Verification Clip provides a convenient way to confirm the operation and soil-moisture accuracy of HOBOnet T11 and T12 sensors. Attaching this clip to a TEROS sensor provides a known soil moisture level for verifying measurement accuracy, without having to test the sensor in actual soils, which normally requires weighing soil samples and drying them in an oven. 

  • Soil moisture (volumetric water content), soil temperature, and electrical conductivity measurements with one device
  • Sensor lasts up to 10 years in the field
  • Largest volume of influence (1010 mL) relative to sensor size, resulting in more accurate soil moisture measurements
  • Easy installation with sharpened stainless-steel probes that are more resistant to damage/deterioration
  • Less sensor-to-sensor variability

In what environment does this operate?

This operates in an outdoor environment.

What measurements does this support?

The supports the following measurements: Electrical Conductivity (soil), Soil Moisture and Soil Temperature

The country of origin for this product is the United States. To see the full specifications for this product, please see our product manual found under the documentation tab if available.

Soil Moisture: Volumetric Water Content (VWC)
Measurement Range* 0.00 to 0.70 m³/m³ in mineral soils
Accuracy ±0.030 m³/m³ (±3%) typical from 0 to 50°C (32 to 122°F); ±0.020 m³/m³ (±2%) with soil specific calibration
Resolution 0.001 m³/m³
Dielectric Measurement Frequency 70 MHz
Temperature**
Measurement Range -40 to 60°C (-40 to 140°F)
Accuracy ±0.5°C (0.9°F) from -40 to 0°C (-40 to 32°F)
±0.3°C (0.54°F) from 0 to 60°C (32 to 140°F)
Resolution 0.1°C (0.18°F)
Bulk Electrical Conductivity (EC)
Measurement Range 0 to 20 dS/m (bulk)
Accuracy ±5% of reading + 0.01 dS/m from 0 to 10 dS/m
±8% of reading from 10 to 20 dS/m
Resolution 0.001 dS/m
Wireless Mote
Operating Temperature Range Sensor: -40 to 60°C (-40 to 140°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-T12-900: 904–924 MHz
RXW-T12-868: 866.5 MHz
RXW-T12-921: 921 MHz
RXW-T12-922: 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 50 motes per one HOBOnet Wireless Sensor Network
Battery Type/
Power Source
Two AA 1.2V rechargeable NiMH batteries, powered by built-in solar panel or two AA 1.5 V 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 Deployment and Mounting), operation outside this range will reduce the battery service life
With lithium batteries: 1 year, typical use
Memory 16 MB
Dimensions Sensor: 7.47 x 9.4 x 2.39 cm (2.94 x 3.7 x 0.94 inches)
Sensor needle length: 5.4 cm (2.13 inches)
Sensor needle diameter: 0.32 cm (0.13 inches)
Cable length: 5 m (16.4 ft)
Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches)
Weight RXW-T12-xxx sensor and cable: 245 grams (8.64 oz)
Mote: 223 g (7.87 oz)
Materials Sensor: ASA plastic body with polyurethane epoxy filling and stainless steel pins
Cable: PVC, UV resistant and rodent repellent
Mote: PCPBT, silicone rubber seal
Environmental Rating Mote: IP67, NEMA 6
Compliance Marks Federal Communication Commission     RXW-T12-900
European Union Compliance     RXW-T12-868
Taiwan Compliance     RXW-T12-921
Australia and New Zealand Complicance     RXW-T12-922

* The sensor data can be post-calibrated if necessary (e.g. the sensor is used in non-mineral soil types or higher than standard accuracy is required). Users can apply a calibration equation to the data exported from HOBOlink. The VWC range will depend on the calibration equation.

** Temperature measurement, for applicable sensors, may not be accurate if sensor is not fully immersed in medium of interest, due to longer equilibration time.

    • Cable ties
    • Screws

The following are associated resources for this product. In general users of this product can gain insight into its possible use by utilizing the resources below. Our user forum can also be a valuable resource for questions, use cases and general feedback. Share with us today, here!

FAQ Tab 
Q.

Are any installation tools available?

A.

Yes. For shallow installation, an auger may be used to dig to the desired depth. For deeper installations, where manual placement may be difficult, a TEROS Borehole Installation Tool may be purchased or rented from METER Group. This tool enables easy installation up to 1.8 m.

Q.

Is calibration required for different soil types? And if so, how is calibration done?

A.

HOBOnet TEROS 11 and TEROS 12 soil moisture sensors come calibrated for most soil types. However, for soil types with high sand or salt content, the standard calibration may not be accurate. In such cases, soil-specific calibration should be used.

 

To determine the soil-specific calibration formula, please refer to: https://www.onsetcomp.com/support/tech-notes/calibrating-ech2o-soil-moisture-sensors-application-note

 

Please note too that because the HOBOnet TEROS 21 sensor measures soil water potential, it does not require soil-specific calibration.

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TEROS-CLIP

The TEROS Verification Clip verifies the proper function and accuracy of HOBOnet T11 and HOBOnet T12 soil moisture sensors. 

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