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    HOBOnet TEROS 21 Soil Water Potential/Temp Sensor

    Manufacturer:
    The HOBOnet TEROS 21 is a wireless sensor that works with the HOBOnet system to measure both soil temperature and soil water potential, a more accurate way to measure how much water is available to plants. The HOBOnet TEROS 21 Sensor is designed to withstand harsh environmental conditions, and it doesn’t require calibration for different soil types or salinity.
    Part Number: RXW-T21-922
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    $1,677.00 ex GST
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    Perfect For Crop Management, Research, and Greenhouse Operations

    A wireless sensor that works with the HOBOnet system to measure both soil temperature and soil water potential, a more accurate way to measure how much water is available to plants. This sensor is designed to withstand harsh environmental conditions, and it does not require calibration for different soil types or salinity. The HOBOnet T21 is calibrated in a chamber system that allows the T21 set calibration points from -10KPa to -80KPa. With its durable epoxy coating, you can be confident these sensors can be deployed in the ground for long periods, while providing data you can trust.

    The HOBOnet system is a cost-effective and scalable option 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.


    Features

    Sensor Features

    • Soil water potential and soil temperature measurements with one device
    • A more accurate picture of the amount of water available to plants than volumetric water content sensors
    • No calibration required for soil type or salinity
    • Long-lasting and maintenance-free with durable epoxy construction
    • Wide measurement range: -9 to -2000 kPa


    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


    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.

    Technical Information

    Water Potential
    Measurement Range -2,000 to -9 kPa in soils up to 10 dS/m
    Accuracy* ±10% of reading + 2 kPa from -100 to -9 kPa
    Resolution 0.1 kPa
    Dielectric Measurement Frequency 70 MHz

    Temperature
    Measurement Range -40 to 60°C (-40 to 140°F)
    Accuracy ±1°C (1.8°F)
    Resolution 0.1°C (0.18°F)

    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-T21-900: 904–924 MHz
    RXW-T21-868: 866.5 MHz
    RXW-T21-921: 921 MHz
    RXW-T21-922: 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 Mounting and Positioning the Mote), operation outside this range will reduce the battery service life
    With lithium batteries: 1 year, typical use
    Memory 16 MB
    Dimensions Sensor: 9.6 x 3.5 x 1.5 cm (3.8 x 1.4 x 0.6 inches)
    Sensor diameter: 3.2 cm (1.3 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-T21-xxx sensor and cable: 103 g (3.65 oz)
    Mote: 223 g (7.87 oz)
    Materials Sensor: Vinyl body with polyurethane resin, stainless steel and ceramic sensor head
    Cable: PVC, UV resistant and rodent repellent
    Mote: PCPBT, silicone rubber seal
    Environmental Rating Mote: IP67, NEMA 6
    Compliance Marks See User Manual

    * The sensor is not well calibrated beyond -100 kPa. For more information on using the sensor beyond this range, see Sensor Accuracy and Calibration.

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

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

    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.

    Perfect For Crop Management, Research, and Greenhouse Operations

    A wireless sensor that works with the HOBOnet system to measure both soil temperature and soil water potential, a more accurate way to measure how much water is available to plants. This sensor is designed to withstand harsh environmental conditions, and it does not require calibration for different soil types or salinity. The HOBOnet T21 is calibrated in a chamber system that allows the T21 set calibration points from -10KPa to -80KPa. With its durable epoxy coating, you can be confident these sensors can be deployed in the ground for long periods, while providing data you can trust.

    The HOBOnet system is a cost-effective and scalable option 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.


    Features

    Sensor Features

    • Soil water potential and soil temperature measurements with one device
    • A more accurate picture of the amount of water available to plants than volumetric water content sensors
    • No calibration required for soil type or salinity
    • Long-lasting and maintenance-free with durable epoxy construction
    • Wide measurement range: -9 to -2000 kPa


    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


    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.

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