The LI200R, manufactured by LI-COR, is a pyranometer that measures both sun and sky solar radiation with a silicon photovoltaic detector mounted in a cosine-corrected head. It connects directly to Campbell Scientific dataloggers and is ideal for agricultural and meteorological applications. The LI200R is calibrated for natural light and should not be used under artificial light or under plant canopy.Read More
The LI200R measures incoming solar radiation with a silicon photovoltaic detector mounted in a cosine-corrected head. The detector outputs current; a shunt resistor in the sensor cable converts the signal from current to voltage, allowing the LI200R to be measured directly by Campbell Scientific dataloggers.
The LI200R is calibrated against an Eppley Precision Spectral Pyranometer to accurately measure sun plus sky radiation. Campbell Scientific does not recommend using the LI200R under vegetation or artificial lights because it is calibrated for the daylight spectrum (400 to 1100 nm).
|Light Spectrum Waveband||400 to 1100 nm|
|Calibration||±5% traceable to the U.S. National Institute of Standards Technology (NIST)|
|Sensitivity||0.13 kW m-2 mV-1 (typically)|
|Linearity||Maximum deviation of 1% up to 3000 W m-2|
|Absolute Error in Natural Daylight||
|Shunt Resistor||100 Ω, 1%, 50 ppm|
|Stability||< ±2% change over a 1-year period|
|Response Time||< 1 μs|
|Temperature Dependence||0.15% per °C maximum|
|Cosine Correction||Cosine corrected up to 82° angle of incidence|
|Operating Temperature Range||-40° to +65°C|
|Relative Humidity Range||0 to 100%|
|Detector Description||High-stability silicon photovoltaic|
|Sensor Housing Description||Weatherproof anodized aluminum case with acrylic diffuser and stainless-steel hardware|
|Diameter||2.36 cm (0.93 in.)|
|Height||3.63 cm (1.43 in.)|
|Weight||84 g (2.96 oz)|
To ensure accurate measurements, the sensor should be leveled using an LI2003S leveling fixture, which incorporates a bubble level and three adjusting screws. The LI2003S leveling fixture mounts to a tripod or tower using the CM225 mount. The LI200R-L should be mounted away from all obstructions and reflective surfaces that might adversely affect the measurement.
The LI200R-L requires one differential analog input channel per probe.