LI190R-L Quantum (PAR) Sensor
Accurate, Versatile
Compatible with most Campbell Scientific data loggers
weather applications supported water applications supported energy applications supported gas flux and turbulence applications supported infrastructure applications supported soil applications supported

Overview

The LI190R Quantum Sensor, manufactured by LI-COR, accurately measures photosynthetic photon flux density (PPFD), which is the number of photons in the 400 to 700 nm waveband incident per unit time on a unit surface. It uses a silicon photovoltaic detector mounted in a cosine-corrected head. A shunt resistor in the sensor’s cable converts the signal from microamps to millivolts, allowing these sensors to be measured directly by a Campbell Scientific data logger.
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Benefits and Features

  • Ideal for growth chambers and greenhouses
  • Measures photosynthetic photon flux density (PPFD) in both natural and artificial light
  • Compatible with the CWS900-series interfaces, allowing it to be used in a wireless sensor network

The "-L" on a product model indicates that the cable length is specified at the time of order.

Images

Mounted LI190R (items sold separately)
Mounted LI190R (items sold separately)
Mounted LI190R (items sold separately)
Mounted LI190R (items sold separately)

Detailed Description

The LI190R measures solar radiation with a silicon photovoltaic detector mounted in a cosine-corrected head. A shunt resistor in the sensor’s cable converts the signal from microamps to millivolts, allowing the LI190R to be measured directly by a Campbell Scientific data logger. The LI190R accurately measures Photosynthetic Photon Flux Density (PPFD), which is the number of photons in the 400 to 700 nm waveband incident per unit time on a unit surface. Because PPFD describes photosynthetic activity, the LI190R is ideal for growth chambers and greenhouses. 

Specifications

Sensor Silicon photovoltaic detector mounted in a cosine-corrected head
Measurement Description Measures photosynthetic photon flux density (PPFD) in both natural and artificial light
Spectral Range 400 to 700 nm
Calibration ±5% traceable to the U.S. National Institute of Standards Technology (NIST)
Sensitivity Typically 5 to 10 μA per 1000 μmoles s-1 m-2
Linearity Maximum deviation of 1% (up to 10,000 μmole s-1 m-2)
Shunt Resistor 604 Ω, 0.1%, 25 ppm
Long-Term 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% (non-condensing)
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

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Data Loggers

Compatible Note
CR1000 (retired)
CR1000X
CR300
CR3000 (retired)
CR310
CR350
CR6
CR800 (retired)
CR850 (retired)

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 tripod using the 015ARM or 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.

Data Logger Considerations

The LI190R-L requires one differential analog input channel per probe.

Related Documents

Articles and Press Releases