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LI-200R Pyranometer


The LI-200R Pyranometer is meant to be used outdoors under unobstructed natural daylight conditions. It measures global solar radiation—the combination of direct and diffuse solar radiation—in the 400 to 1100 nm range. Measurement units are in watts per square meter (W m-2).

Ideal for agricultural, meteorological, solar energy, and environmental research, the LI-200R is available with a variety of cable lengths and compatibility with most data loggers.

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Why choose the LI-200R?

  • Weather resistant and durable in long-term outdoor deployments
  • Measures global solar radiation under unobstructed natural daylight conditions
  • Uniform sensitivity up to 82° incident angle
  • Detachable sensor simplifies installation and removal, making it ideal for platforms with complex cabling
LI-200R Photometric Sensor detached from removable base

How does it work?

The LI-200R measures global solar radiation with an unfiltered silicon photodiode. Its measurements correspond closely to first-class thermopiles when used outdoors under unobstructed natural daylight conditions.

The crown of the sensor rapidly sheds water, and also physically blocks light from outside the hemisphere of sensitivity, providing a precise cosine response.

Cosine Response at an angle of incidence of 80 degrees

Learn more about the science and engineering behind the new design

LI-200R Pyranometer in Mounting and Leving Fixture

LI-200R Specifications

  • Absolute Calibration: Calibrated against an Eppley Precision Spectral Pyranometer (PSP) under natural daylight conditions. Calibration uncertainty under these conditions is estimated as ± 3% typical, within ± 60° angle of incidence.*
  • Sensitivity: Typically 75 μA per 1,000 W m-2
  • Linearity: Maximum deviation of 1% up to 3,000 W m-2
  • Response Time: Less than 1μs (2 m cable terminated into a 147 Ohm load)
  • Temperature Dependence: ± 0.15% per °C maximum
  • Cosine Correction: Cosine corrected up to 82° angle of incidence
  • Azimuth: < ± 1% error over 360° at 45° elevation
  • Tilt: No error induced from orientation
  • Operating Temperature Range: −40 °C to 65 °C
  • Relative Humidity Range: 0% to 100% RH, Non-Condensing
  • Detector: High stability silicon photovoltaic detector (blue enhanced)
  • Sensor Housing: Weatherproof anodized aluminum body with acrylic diffuser and stainless steel hardware; O-ring seal on the sensor base
  • Size: 2.36 cm diameter × 3.63 cm (0.93” × 1.43”)
  • Weight: 24 g head; 60 g base and cable (2 m) with screws
  • Cable Length: 2 m, 5 m, 15 m, 50 m (6.5’, 16.4’, 49.2’, 164’)

*Preliminary specification

Need a data logger or light meter?

Check out the LI-1500 Light Sensor Logger and LI-250A Light Meter.

2291 Light Sensor Millivolt Adapter

Have a data logger already?

You might want a signal conditioner, such as a Millivolt Adapter or Light Sensor Amplifier.

Why Upgrade to the "R" Light and Radiation Sensors?

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Pyranometer Light Sensor Resources

  • docReferences:
    • Biggs, W.W., A.R. Edison, J.D. Easton, K.W. Brown, J.W. Maranville and M.D. Clegg. 1971. Photosynthesis light sensor and meter. Ecology 52:125-131.
    • De Wit, C. T. 1965. Photosynthesis of leaf canopies. Agric. Res. Rep. No. 663. Institute for Bio. and Chem. Res. on Field Crops and Herbage. Wageningen, The Netherlands.
    • Federer, C.A. and C.B. Tanner. 1966. Sensors for measuring light available for photosynthesis. Ecology 47:654-657.
    • Hesketh, J., and D. Baker. 1967. Light and carbon assimilation by plant communities. Crop Sci. 7:285-293.
    • Flowers, E.C. 1978. Comparison of solar radiation sensors from various manufacturers.  In: 1978 annual report from NOAA to the DOE.
    • Kerr, J.P., G.W. Thurtell and C.B. Tanner. 1967. An integrating pyranometer for climatological observer stations and mesoscale networks. J. Appl. Meterol. 6:688-694.
    • Kondratyev, K. Ya. 1969. Direct solar radiation. Radiation in the atmosphere. Academic Press, New York-London.
    • Palmiter, L.S., L.B. Hamilton, M.J. Holtz. 1979. Low cost performance evaluation of passive solar buildings. SERI/RR-63-223. UC-59B.