HOBOnet Solar Radiation (Silicon Pyranometer) Sensor


The HOBOnet Wireless Solar Radiation (Silicon Pyranometer) Sensor is calibrated to measure light intensity for frequencies relevant for solar radiation. 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.

Highlighted Features

Sensor Features
    Measurement range of 0 to 1280 W/m2 over a spectral range of 300 to 1100 nm
    Enclosed in an anodized aluminum housing with acrylic diffuser and O-ring seal

Wireless Features
    868 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 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-LIB-xxx sensor supports the following measurements: Evapotranspiration, Light Intensity and Solar Radiation


Measurement Range

0 to 1280 W/m2

Spectral Range

300 to 1100 nm


Typically within ±10 W/m2 or ±5%, whichever is greater in sunlight; Additional temperature induced error ±0.38 W/m2/°C from 25°C (0.21 W/m2/°F from 77°F)

Angular Accuracy

Cosine corrected 0 to 80 degrees from vertical (see Plot B); Azimuth Error <±2% error at 45 degrees from vertical, 360 degree rotation


1.25 W/m2


<±2% per year

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-LIB-900: 904–924 MHz
RXW-LIB-868: 866.5 MHz
RXW-LIB-922: 916–924 MHz

Modulation Employed

OQPSK (Offset Quadrature Phase Shift Keying)

Data Rate

Up to 250 kbps, non-adjustable

Duty Cycle


Maximum Number of Motes

50 motes per one RX 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 Deployment and Mounting), operation outside this range will reduce the battery service life
With lithium batteries: 1 year, typical use


16 MB


Sensor: 4.1 cm height x 3.2 cm diameter (1.61 x 1.26 inches)
Cable length: 2 m (6.56 ft)
Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches)


Sensor and cable: 109 g (3.85 oz)
Mote: 223 g (7.87 oz)


Sensor: Anodized aluminum housing with acrylic diffuser and O-ring seal
Mote: PCPBT, silicone rubber seal

Environmental Rating

Sensor: Weatherproof
Mote: IP67, NEMA 6

Compliance Marks

Federal Communication Commission     RXW-LIB-900
European Union Compliance     RXW-LIB-868
Australia and New Zealand Complicance     RXW-LIB-922

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