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HOBOnet T21 Soil Water Potential & Temp Sensor

R11,234.73

The HOBOnet T21 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...

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  • Product Code: RXW-T21-868
  • Availability: 7-10 Days

Tags: soil moisture, sensor, soil temperature, HOBOnet, soil water potential

Soil Water Potential & Temperature HOBOnet T21 Sensor

The HOBOnet T21 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 T21 Sensor is designed to withstand harsh environmental conditions, and it does not require calibration for different soil types or salinity.  The HOBOnet T21 features the METER TEROS 21 sensor, which is calibrated in a chamber system that allows the TEROS 21 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.

Highlighted 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

 

In what environment does this operate?

This operates in an outdoor environment.

What measurements does this support?

The supports the following measurements: Soil Moisture, Soil Temperature, and Soil Water Potential

 

Sensor
Environmental Rating Mote: IP67, NEMA 6
Sensor Accuracy Soil Moisture: Volumetric Water Content (VWC): ±0.030 m³/m³ (±3%) typical from 0 to 50°C (32 to 122°F); ±0.020 m³/m³ (±2%) with soil specific calibration Temperature: ±1.0°C (1.8°F) from -40 to 0°C (-40 to 32°F) ±0.5°C (0.9°F) from 0 to 60°C (32 to 140°F) Water Potential: ±10% of reading + 2 kPa from -100 to -9 kPa
Sensor Dielectric Measurement Frequency 70 MHz
Sensor 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)
Sensor Measurement Range Soil Moisture: Volumetric Water Content (VWC): 0.00 to 0.70 m³/m³ in mineral soils Temperature: -40 to 60°C (-40 to 140°F) Water Potential: -2,000 to -9 kPa in soils up to 10 dS/m
Sensor Memory Capacity 16MB
Sensor Resolution Soil Moisture: Volumetric Water Content (VWC): 0.001 m³/m³ Temperature: 0.1°C (0.18°F) Water Potential: 0.1 kPa
Sensor Weight RXW-T21-xxx sensor and cable: 245 g (8.64 oz) Mote: 223 g (7.87 oz)
Wireless Mote
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
Data Rate Up to 250 kbps, non-adjustable
Duty Cycle <1%
Logging Rate Logging Rate - 1 minute to 18 hours
Maximum Number of Motes 50 motes per one HOBOnet Wireless Sensor Network
Modulation Employed OQPSK (Offset Quadrature Phase Shift Keying)
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)
Radio Operating Frequencies 866.5 MHz
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
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