Image
Part Numbers
RXW-T12-900
•RXW-T12-922
•RXW-T12-868
•RXW-T12-921
HOBOnet T12 Soil Moisture/Temp/EC Sensor
$615.00 USD
A durable wireless sensor that works with the HOBOnet system to measure soil moisture, temperature, and electrical conductivity; lasts up to 10 years in the field.
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
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, this durable sensor 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 an increased volume of influence provides more accurate results. The HOBOnet T12 is backed by over 20 years of soil-moisture research and features a 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 software platform.
We recommend using the Verification Clip (see Compatible Items, below). The 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 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.
Features
Sensor Features
- 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
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 or 336 data channels 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
Specifications
Soil Moisture: Volumetric Water Content (VWC)
-
0.00 to 0.70 m³/m³ in mineral soils
-
±0.030 m³/m³ (±3%) typical from 0 to 50°C (32 to 122°F); ±0.020 m³/m³ (±2%) with soil specific calibration
-
0.001 m³/m³
-
70 MHz
Measurement Range*
Accuracy
Resolution
Dielectric Measurement Frequency
Temperature**
-
-40 to 60°C-40 to 140°F
-
±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)
-
0.1°C0.18°F
Measurement Range
Accuracy
Resolution
Bulk Electrical Conductivity (EC)
-
0 to 20 dS/m (bulk)
-
±5% of reading + 0.01 dS/m from 0 to 10 dS/m
±8% of reading from 10 to 20 dS/m
-
0.001 dS/m
Measurement Range
Accuracy
Resolution
Wireless Mote
-
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
-
12.6 mW (+11 dBm) non-adjustable
-
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
-
IEEE 802.15.4
-
RXW-T12-900: 904-924 MHz
RXW-T12-868: 866.5 MHz
RXW-T12-921: 921 MHz
RXW-T12-922: 916-924 MHz
-
OQPSKOffset Quadrature Phase Shift Keying
-
Up to 250 kbps, non-adjustable
-
<1%
-
Up to 50 wireless sensors or 336 data channels per one HOBO RX station
-
1 minute to 18 hours
-
4
-
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)
-
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
-
16 MB
-
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)
-
RXW-T12-xxx sensor and cable: 245 grams (8.64 oz)
Mote: 223 g (7.87 oz)
-
Sensor: ASA plastic body with polyurethane epoxy filling and stainless steel pins
Cable: PVC, UV resistant and rodent repellent
Mote: PCPBT, silicone rubber seal
-
Mote: IP67, NEMA 6
Operating Temperature Range
Radio Power
Transmission Range
Wireless Data Standard
Radio Operating Frequencies
Modulation Employed
Data Rate
Duty Cycle
Maximum Number of Motes
Logging Rate
Number of Data Channels
Battery Type/ Power Source
Battery Life
Memory
Dimensions
Weight
Materials
Environmental Rating
Notices
-
* 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.
Image
Image
Image
Image
Compatible items
Web-based Monitoring Systems - via remote communication
Maintenance
Batteries
Communications
What's in the box
- HOBOnet T12 Soil Moisture/Temp/EC Sensor
- Cable ties
- Screws
FAQs
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.
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.
Customers Also Bought
Data Logger
MicroRX Station
A rugged, easy-to-deploy, low-cost cellular solution for long-term, reliable field monitoring. Inputs for up to five plug-and-play sensors. Data access through LI-COR Cloud platform.
Data Logger
RX3000 Remote Monitoring Station
The most flexible remote data logging cloud-based station from HOBO that provides real-time, site-specific indoor/outdoor environmental data
Sensor
HOBOnet Temp/RH Sensor
A solar-powered wireless sensor that works with the HOBOnet system to monitor air temperature and relative humidity.
Accessory
Verification Clip
The Verification Clip verifies the proper function and accuracy of HOBO MX Soil Moisture data loggers, HOBOnet T11 soil moisture sensors, and HOBOnet T12 soil moisture sensors