The HOBOnet Wireless Temperature Sensor provides a cost-effective and scalable solution for web-enabled monitoring of air, soil, and water temperatures. HOBOnet Wireless Sensors communicate data directly to the RX3000 weather 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-based software platform.
Sensor Features
Measurement range of -40° to 100°C
High accuracy: ± 0.2°C
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
868 MHz wireless mesh self-healing technology
450 to 600 meter wireless range
Up to 50 wireless sensors per RX3000
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
The RXW-TMB-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
(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
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
RXW-TMB-868
RXW-TMB-922
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