Photosynthetically Active Radiation (PAR)
Smart Sensor (S-LIA-M003) Manual
5942-H
The photosynthetically active radiation (PAR) smart sensor is designed to work with HOBO®
stations. The smart sensor has a plug-in modular connector that allows it to be added easily to a
station. All calibration parameters are stored inside the smart sensor, which automatically
communicates configuration information to the logger without any programming, calibration, or
extensive user setup.
Specifications
Measurement Range
0 to 2500
µ
mol/m
2
/sec, wavelengths 400 to 700 nm (see Plot A)
Accuracy
±5
µ
mol/m
2
/sec or ± 5%, whichever is greater in sunlight; Additional
temperature induced error ±0.75
µ
mol/m
2
/sec/°C from 25°C
(0.42
µ
mol/m
2
/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
µ
mol/m
2
/sec
Drift
< ±2% per year
Operating Temperature Range
-40° to 75°C (-40° to 167°F)
Environmental Rating
Weatherproof
Housing
Anodized aluminum housing with acrylic diffuser and O-ring seal
Dimensions
4.1 cm height x 3.2 cm diameter (1 5/8 x 1 1/4 in)
Weight
120 g (4 oz)
Bits per Sample
10
Number of Data Channels*
1
Measurement Averaging Option
Yes
Cable Length Available
3.0 m (9.8 ft)
Length of Smart Sensor
Network Cable*
3.0 m (9.8 ft)
The CE Marking identifies this product as complying with all relevant
directives in the European Union (EU).
* A single HOBO station can accommodate 15 data channels and up to 100 m (328 ft) of smart sensor cable (the digital
communications portion of the sensor cables).
Typical Quantum Response
The PAR smart sensor is designed to detect photons between 400-700 nm in wavelength. Ideally
the sensor would count photons with equal efficiency between 400-700 nm and no photons
would be counted outside this range. However, in reality, this sensor undercounts photons
between 400-550 nm and between 670-700 nm, and it over counts photons between 550-670 nm.
In most applications (where the sensor is used in natural sunlight) the error is not significant.
Plot A: PAR Smart Sensor Typical Quantum Response
PAR Smart Sensor
S-LIA-M003
Accessories:
•
Light sensor mounting
bracket (M-LBB)
•
Light sensor level (M-LLA)
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