LI200R-L Pyranometer
Accurate, Versatile
Compatible with most Campbell Scientific dataloggers
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications

We recommend the CS320 Digital Thermopile Pyranometer for all new installations.  The LI200R-L is available as a replacement part for existing stations/networks that require it.


Overview

The LI200R, manufactured by LI-COR, is a silicon pyranometer that accurately monitors sun plus sky radiation for solar, agricultural, meteorological, and hydrological applications. It uses a silicon photovoltaic detector mounted in a cosine-corrected head to measure solar radiation. A shunt resistor in the sensor’s cable converts the signal from microamps to millivolts, allowing this sensor to be measured directly by a Campbell Scientific datalogger.

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Benefits and Features

  • Calibrated against an Eppley precision spectral pyranometer (PSP) for the daylight spectrum (400 to 1100 nm)
  • Uniform sensitivity up to 82° incident angle

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 (blue enhanced)
Sensor Housing Description Weatherproof anodized aluminum case with acrylic diffuser and stainless-steel hardware; O-ring seal on the removable base and cable assembly
Diameter 2.36 cm (0.93 in.)
Height 3.63 cm (1.43 in.)
Weight 84 g (2.96 oz)

Compatibility

Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Data Loggers

Product Compatible Note
21X (retired)
CR10 (retired)
CR1000
CR1000X
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR295X (retired)
CR300
CR3000
CR310
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR6
CR800
CR850
CR9000 (retired)
CR9000X

Additional Compatibility Information

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 crossarm using the CM225 mount. These sensors 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.

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