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HOBOnet Wireless Temperature Sensor


A battery-powered wireless sensor that works with the HOBOnet system to monitor air temperature.

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A cost-effective and scalable solution for web-enabled monitoring of air temperature. HOBOnet wireless sensors communicate data directly to a HOBO RX 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.

Highlighted Features

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

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 sensor operate?

This sensor operates in an indoor environment.

What measurements does this sensor support?

The RXW-TMB-x-xxx sensor supports the following measurements: Air Temperature, Soil Temperature, Temperature and Water Temperature



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 (typical, to 90% of change) 2 minutes, 30 seconds in air moving 1 m/sec

Wireless Mote

Operating Temperature Range -40° to 70°C (-40° to 158°F)
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-x-900: 904–924 MHz
RXW-TMB-x-868: 866.5 MHz
RXW-TMB-x-921: 921 MHz
RXW-TMB-x-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 Up to 50 wireless sensors or 336 data channels per one HOBO RX station
Logging Rate 1 minute to 18 hours
Number of Data Channels 2
Battery Type Two AA 1.5 V lithium batteries
Battery Life 1 year, typical use
Memory 16 MB
Dimensions Sensor: 5.1 x 33 mm (0.2 x 1.3 inches)
Cable length: 0.3 m (1 ft), RXW-TMB-1-xxx; 1.8 m (6 ft), RXW-TMB-6-xxx
Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches)
Weight Sensor and cable: 7.6 g (0.27 oz), RXW-TMB-1-xxx; 35.2 g (1.24 oz), RXW-TMB-6-xxx
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-LIA-900


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