QUANTUM PAR SENSOR - Model LI-190SA
Manufactured By: LiCor

 

Plants use the 400 to 700 nm waveband of the light spectrum for photosynthesis. A simple integral relationship exists between the
number of molecules changed photochemically and the number of photons absorbed within the requisite waveband regardless of
photon energy. The preferred measurement for PAR is Photosynthetic Photon Flux Density (PPFD). This is the number of photons
in the 400 to 700 nm waveband incident per unit time on a unit surface. Plant scientists, meteorologists, horticulturists, ecological
survey groups and other environmental scientists are using this sensor to measure PPFD in the atmosphere, growth chamber and
greenhouse. Accurate measurements are obtained under natural and artificial light conditions because of the computer-tailored spectral
response of the Quantum sensor. Colored glass filters are used to tailor the silicon photodiode response and an interference filter is
used to provide a sharp cutoff at 700 nm. A sharp cutoff is necessary at 700 nm for measurements under vegetation where the ratio
of infrared to visible light may be high. A small response in the infrared region can cause an appreciable measurement error. The
quantum sensor is also used in oceanography, limnology, and marine science as a reference sensor for comparison to underwater PPFD.
                                                 
   

Specifications
    Absolute Calibration: ±5% traceable to the U.S. National Bureau of Standards (NBS)
    Sensitivity: Typical 5µA per 1000 µmol s -1 m -2
    Linearity: Maximum deviation of 1% up to 10,000 µmol s -1 m -2
    Stability: <±2% change over a 1 year period
    Response Time: 10µs
    Temperature Dependence: 0.15% per ºC maximum
    Cosine Correction: Cosine corrected up to 80º angle of incidence
    Azimuth: <±1% error over 360º at 45º elevation
    Tilt: No error induced from orientation
    Operating Temperature: -40 to 65ºC
    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
    Size: 2.38 cm X 2.54 cm (0.94" X 1.0") diameter
    Weight: 28 g (1 oz.)
    Cable Length: 3.0 m (10 ft.)
    Accessories: 2003S Mounting and Leveling Fixture, 2222SB Extension Cable