LI190R-L Quantum Sensor

Overview

The LI190R, manufactured by LI-COR, is a quantum sensor that accurately monitors Photosynthetic Photon Flux Density (PPFD) in both natural and artificial light. It connects directly to our dataloggers and is ideal for growth chambers and greenhouses. 

Read More

Benefits and Features

  • Compatible with most Campbell Scientific dataloggers
  • 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

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 datalogger. 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

Light Spectrum Waveband 400 to 700 nm
Calibration ±5% traceable to the U.S. National Institute of Standards Technology (NIST)
Sensitivity Range 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%
Detector Description High-stability silicon photovoltaic (blue enhanced)
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 LI190R-L should be mounted away from all obstructions and reflective surfaces that might adversely affect the measurement.

Datalogger Considerations

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

Compatible Contemporary Dataloggers

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

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X

Documents


Articles and Press Releases