The LI-192 Underwater Quantum Sensor measures PAR from all angles in one hemisphere. The LI-192 works in air or underwater at depths up to 560 meters. The measurements are cosine corrected and typically expressed as Photosynthetic Photon Flux Density (PPFD). For simultaneous measurements of downwelling and upwelling PAR, two sensors can be mounted on the 2009S Lowering Frame.
Absolute Calibration: ± 5% in air traceable to NIST
Sensitivity: Typically 4 μA per 1,000 μmol s-1 m-2 in water
Linearity: Maximum deviation of 1% up to 10,000 μmol s-1 m-2
Response Time: 10 μs
Temperature Dependence: ± 0.15% per °C maximum
Cosine Correction: Optimized for underwater and atmospheric use
Azimuth: < ± 1% error over 360° at 45° elevation
Operating Temperature Range: −40 °C to 65 °C
Detector: High stability silicon photovoltaic detector (blue enhanced)
Sensor Housing: Corrosion resistant metal with acrylic diffuser for both saltwater and freshwater applications. Waterproof to withstand approximately 5500 kPa, 560 meters (800 psi).
Size: 3.18 cm diameter × 4.62 cm height (1.25” × 1.81”)
Weight: 227 g (8 oz)
Mounting: Three 6-32 holes are tapped into the base for use with the 2009S Lowering Frame or other mounting devices
Cable: Requires 2222UWB Underwater Cable (available in 3, 10, 30, 50, 100 meter lengths)
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