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LI200RX-L Pyranometer with Fixed Calibration

Overview

The LI200RX pyranometer measures both sun and sky solar radiation with a silicon photovoltaic detector mounted in a cosine-corrected head. The cable contains circuitry that standardizes sensor calibration, allowing complete sensors and cabling to be swapped out in the field without having to change the datalogger programming. 

This pyranometer connects directly to Campbell Scientific dataloggers and is ideal for agricultural and meteorological applications. The LI200RX is calibrated for natural light. Campbell Scientific does not recommend using the LI200RX under artificial light or plant canopy.


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Benefits and Features

  • Compatible with most Campbell Scientific dataloggers

Images

LI200RX-L with cable
LI200RX-L with cable
LI200RX-L with cable
LI200RX-L with LI2003S leveling base (sold separately)
Close-up view of the LI200RX-L sensor head
LI200RX-L with a LI2003S leveling base, mounting bracket, and CM225 (all sold separately)
LI200RX-L with a LI2003S leveling base, mounting bracket, and CM225 (all sold separately)
LI200RX-L with a LI2003S leveling base, mounting bracket, and CM225 (all sold separately)

Detailed Description

The LI200RX pyranometer monitors sun plus sky radiation. It connects directly to Campbell Scientific dataloggers and is used extensively in solar, agricultural, and meteorological applications. This pyranometer includes a completion circuit in its cable that standardizes calibration, allowing complete sensors and cabling to be interchanged without altering multiplier and offset values.

The LI200RX sensor head is calibrated against an Eppley Precision Spectral Pyranometer to accurately measure sun plus sky radiation. Campbell Scientific does not recommend using the LI200RX 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 0.2 kW m-2 mV-1
Linearity Maximum deviation of 1% up to 3000 W m-2
Absolute Error in Natural Daylight
  • ±5% (maximum)
  • ±3% (typical)
Shunt Resistor Adjustable, 40.2 to 90.2 Ω (factory set to give the above sensitivity)
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
The overmolding that protects the completion circuit in the cable of the LI200RX may crack if temperatures drop below -40°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. Campbell Scientific recommends mounting the LI200RX-L away from all obstructions and reflective surfaces that might adversely affect the measurement.

Datalogger Considerations

The LI200RX-L requires one differential analog input channel per probe.

Compatible Contemporary Dataloggers

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

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X

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