LI200R-L Pyranometer

Overview

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.

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Benefits and Features

  • Compatible with most Campbell Scientific dataloggers
  • Ideal for agricultural and meteorological applications
  • Measures sun plus sky radiation
  • Compatible with the CWS900-series interfaces, allowing it to be used in a wireless sensor network

Images

LI200R-L with cable
LI200R-L with cable
LI200R-L with cable
LI200R-L with sensor head separated from cable
LI200R-L with a LI2003S leveling base (sold separately)
LI200R-L with a LI2003S leveling base, mounting bracket, and CM225 (all sold separately)
LI200R-L with a LI2003S leveling base, mounting bracket, and CM225 (all sold separately)
LI200R-L with a LI2003S leveling base, mounting bracket, and CM225 (all sold separately)

Detailed Description

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).

Specifications

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
  • ±5% (maximum)
  • ±3% (typical)
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)

Compatibility

Mounts

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.

Datalogger Considerations

The LI200R-L requires one differential analog input channel per probe.

Compatible Contemporary Dataloggers

CR200(X)
Series
CR800/CR850 CR1000 CR3000 CR6 CR9000X CR300
Series
CR1000X

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X

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