SQ-316-stock 6-in-Line Quantum Sensor (ex-stock-unit)


Apogee Instruments


Apogee line quantum sensors measure a spatial average of  PAR (Photosynthetically Active Radiation). The SQ-316 has a sensor bar with 6 sensors and is self-powered with a 0 to 800 mV output. The sensor is calibrated for use in sunlight.

300,00 €

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The Sensor measures: PAR Light
Output Signal: mV
Cable Length: 5 meters
Power Supply: Does not require
Sensor for use in: Outdoor & Underwater

This is our quantum sensor and line quantum sensor, designed for use with dataloggers. Line quantum sensors are often used to quantify the variable light in greenhouses and below plant canopies because they provide a spatial average.

An innovative blue lens improves the accuracy of these sensors. The pigments in the lens filter incoming light for an improved spectral response.

The sensor housing design features an integrated bubble level and is fully potted making the sensor weatherproof. 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/PPFD in aquatic environments, including salt water aquariums where corals are grown. Sensor includes IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.

Cosine Response

• 45º zenith angle: ± 1%

• 75º zenith angle: ± 5%

Absolute Accuracy

• ± 5%


• ± 1%


• SQ-100 series: 2.4 cm diameter by 2.75 cm height

• SQ-313, 316, 323, 326: 50 cm

• SQ-311, 321: 70 cm

Long-Term Drift

• Less than 3% per year

Operating Environment

• -25 to 55 C

• 0 to 100% relative humidity

• Designed for continuous outdoor use

• Can be submerged in water


• SQ-100 series: 70 g (with 5 meters lead wire)

• SQ-313, 316, 323, 326: 275g

• SQ-311, 321: 375g


• Anodized aluminum with cast acrylic lens


• 5 meters of twisted-pair wire

• Foil shield

• Santoprene jacket

• Ending in pigtail leads

• Additional cable is available in multiples of 5 meters


• 1 year against defects in materials and workmanship

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