FGI Apogee Instruments SDI-12 Digital Output Quantum Sensor

The SQ-421 is a digital sensor that uses SDI-12 communication protocol. The sensor is calibrated for sunlight and electric lights, selectable through SDI-12 commands, and has a command that automatically applies the immersion effect correction factor for underwater measurements. The sensor features a rugged, self-cleaning sensor housing design. Typical applications include PPFD (Photosynthetic Photon Flux Density) measurement over plant canopies in outdoor environments, greenhouses, and growth chambers, and reflected or under-canopy (transmitted) PPFD measurements in the same environments. Quantum sensors are also used to measure PAR (Photosynthetically Active Radiation)/PPFD in aquatic environments, including salt water aquariums where corals are grown.