Product Spotlight: LI-COR Underwater PAR Sensors

LI-COR underwater PAR sensors provide accurate measurements of photosynthetically active radiation in freshwater or saltwater environments. Limnologists conducting aquatic productivity studies and vertical profiling have used these sensors extensively.

Measurement of photosynthetically active radiation (400-700 nm) in aquatic environments can be accomplished using either the LI-192SA Underwater Quantum Sensor or the LI-193SA Spherical Quantum Sensor.

The LI-192 model is cosine corrected and features corrosion resistant, rugged construction for use at pressures up to 800 psi or 560 meter depths.

The LI-193 provides an added dimension to underwater PAR measurements, as it measures photon flux from all directions. This measurement is referred to as Photosynthetic Photon Flux Fluence Rate (PPFFR) or Quantum Scalar Irradiance.

This is important, for example, when studying phytoplankton, which utilize radiation from all directions for photosynthesis. The LI-193 features a high sensitivity optical design and can be used at pressures up to 493 psi or 350 meter depths.

For extremely turbid conditions, radiation levels with resolution to 0.01 µmol s^-1 m^-2 are possible with either sensor. Both the LI-192 and the LI-193 use computer-tailored filter glass to achieve the desired quantum response. Calibration is traceable to NIST.

Both sensors include built-in voltage outputs that allow them to interface with NexSens data loggers. Sensor cable can be factory-connectorized with NexSens underwater connectors for integration to an SDL submersible data logger sensor port.

For more information about LI-COR light sensor products, call Fondriest Environmental at (888) 426.2151, e-mail customercare@fondriest.com, or visit http://www.fondriest.com/vendor/li-cor.htm.