HOBOnet PAR Sensor
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Overview
Measures light intensity for frequencies relevant to photosynthesis. HOBOnet wireless sensors communicate data directly to the HOBO RX3000 or the HOBO MicroRX station or pass data through other wireless sensors back to the central station. These sensors are preconfigured and ready to deploy, and data is accessed through HOBOlink, Onset's innovative cloud software platform.
Features
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
- 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
Specifications
Sensor
Measurement Range
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0 to 2500 μmol/m2/sec, wavelengths 400 to 700 nm
Accuracy
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±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
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Cosine corrected 0 to 80 degrees from vertical; Azimuth Error <2% error at 45 degrees from vertical, 360 degree rotation
Resolution
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2.5 μmol/m2/sec
Drift
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<±2% per year
Wireless Mote
Operating Temperature Range
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-25° to 60°C (-13° to 140°F) with rechargeable batteries-40 to 70°C (-40 to 158°F) with lithium batteries
Radio Power
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12.6 mW (+11 dBm) non-adjustable
Transmission Range
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Reliable connection to 457.2 m (1,500 ft) line of sight at 1.8 m (6 ft) highReliable connection to 609.6 m (2,000 ft) line of sight at 3 m (10 ft) high
Wireless Data Standard
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IEEE 802.15.4
Radio Operating Frequencies
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RXW-LIA-900: 904-924 MHzRXW-LIA-868: 866.5 MHzRXW-LIA-922: 916-924 MHzRXW-LIA-921: 921 MHz
Modulation Employed
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OQPSKOffset Quadrature Phase Shift Keying
Data Rate
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Up to 250 kbps, non-adjustable
Duty Cycle
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<1%
Maximum Number of Motes
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Up to 50 wireless sensors or 336 data channels per one HOBO RX station
Logging Rate
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1 minute to 18 hours
Number of Data Channels
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2
Battery Type/ Power Source
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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
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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
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16 MB
Dimensions
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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
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Sensor and cable: 109 g (3.85 oz)Mote: 223 g (7.87 oz)
Materials
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Sensor: Anodized aluminum housing with acrylic diffuser and O-ring sealMote: PCPBT, silicone rubber seal
Environmental Rating
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Sensor: WeatherproofMote: IP67, NEMA 6
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