The HOBOnet Wireless Photosynthetic Active Radiation (PAR) Sensor measures light intensity for frequencies relevant to photosynthesis. 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 0 to 2500 umol/m2/sec over wavelengths from 400 to 700 nm
Enclosed in an anodized aluminum housing with acrylic diffuser
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-LIA-xxx sensor supports the following measurements: Light Intensity and PAR
Measurement Range
0 to 2500 μmol/m2/sec, wavelengths 400 to 700 nm
Accuracy
±5 μmol/m2/sec or ± 5%, whichever is greater in sunlight; Additional temperature induced error ±0.75 μmol/m2/sec/°C from 25°C (0.42 μmol/m2/sec/°F from 77°F)
Angular Accuracy
Cosine corrected 0 to 80 degrees from vertical; Azimuth Error <2% error at 45 degrees from vertical, 360 degree rotation
Resolution
2.5 μmol/m2/sec
Drift
<±2% per year
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-LIA-900: 904–924 MHz
RXW-LIA-868: 866.5 MHz
RXW-LIA-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-LIA-900
RXW-LIA-868
RXW-LIA-922
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