HOBOnet Solar Radiation (Silicon Pyranometer) Sensor

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

Sensor

Measurement Range

0 to 1280 W/m2

Spectral Range

300 to 1100 nm

Accuracy

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

Resolution

1.25 W/m2

Drift

<±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

<1%

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

Memory

16 MB

Dimensions

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)

Weight

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

Materials

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

RXW-LIB-900
RXW-LIB-868
RXW-LIB-922