Canada’s Instrumentation Leader Since 1946.

HOBOnet Temp Sensor


A solar-powered wireless sensor that works with the HOBOnet system to monitor air, soil, and water temperatures.

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A cost-effective and scalable solution for web-enabled monitoring of air, soil, and water temperatures. HOBOnet wireless sensors communicate data directly to the HOBO RX3000 or the HOBO MicroRX station, or pass data through other wireless sensors back to the central station. They are preconfigured and ready to deploy, and data is accessed through HOBOlink, Onset’s innovative cloud software platform.

Sensor Features

  • Measurement range of -40° to 100°C (-40° to 212°F)
  • High accuracy: ± 0.2°C ( ± 0.36°F)
  • Stainless-steel sensor tip
  • Sensor and cable rated for immersion in water or soil up to 50°C for up to 1 year

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


Measurement Range -40° to 100°C (-40° to 212°F)
Accuracy ±0.25°C from -40° to 0°C (±0.45°F from -40° to 32°F)
±0.20°C from 0° to 70°C (±0.36°F from 32° to 158°F)
±0.25°C from 70° to 100°C (±0.45°F from 158° to 212°F)
Resolution 0.02°C (0.036°F)
Drift <0.01°C (0.018°F) per year
Response Time
(to 90% of step change)   
Without solar radiation shield: 2 minutes, 30 seconds in air moving 1 m/sec
With RS3-B solar radiation shield: 5 minutes in air moving 1 m/sec

Wireless Mote

Operating Temperature Range -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-TMB-900: 904–924 MHz
RXW-TMB-868: 866.5 MHz
RXW-TMB-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 RX Wireless Sensor Network
Battery Type/ Power Source Two AA 1.2 V 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: 5.1 x 33 mm (0.2 x 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 Sensor and cable: 82.5 g (2.91 oz)
Mote: 223 g (7.87 oz)
Materials Sensor: Stainless steel waterproof tip
Mote: PCPBT, silicone rubber seal
Environmental Rating Sensor and cable: Immersion in water up to 50°C (122°F) for 1 year
Mote: IP67, NEMA 6
Compliance Marks      RXW-TMB-900


Phone: 800-665-5871
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