This product is no longer available. Some accessories, replacement parts, or services may still be available.
LI190SB-L Quantum Sensor
Services Available
Repair No
Calibration Yes
Free Support No


The LI190SB, 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 data loggers
  • 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


Detailed Description

The LI190SB 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 LI190SB to be measured directly by a Campbell Scientific datalogger.

LI190SB 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 LI190SB is ideal for growth chambers and greenhouses.



Light Spectrum Waveband 400 to 700 nm
Calibration ±5% traceable to the U.S. National Institute of Standards Technology (NIST)
Sensitivity Typically 5 μA per 1000 μmoles s-1 m-2
Linearity Maximum deviation of 1% up to 10,000 μmoles s-1 m-2
Shunt Resistor ±15% over thermal conductivity range (from 0.1 to 1.7 W m-2 K-1)
Stability < ±2% change (over a 1 year period)
Response Time 10 μs
Temperature Dependence 0.15% per °C (maximum)
Cosine Correction Cosine corrected up to 80° angle of incidence
Operating Temperature -40° to +65°C
Relative Humidity 0 to 100%
Detector High stability silicon photovoltaic detector (blue enhanced)
Sensor Housing Weatherproof anodized aluminum case (with acrylic diffuser and stainless-steel hardware)
Diameter 2.38 cm (0.94 in.)
Height 2.54 cm (1.00 in.)
Weight 28 g (1 oz)


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


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

Additional Compatibility Information


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 LI190SB should be mounted away from all obstructions and reflective surfaces that might adversely effect the measurement.

Data Logger Considerations

The LI190SB requires one differential analog input channel per probe.