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SQ-500 Package: Full-spectrum Quantum Sensor

Make:  Apogee                                         Model:  SQ-500
✅ It is cost effective.
✅ Original quantum sensors work well for broadband radiation sources.
✅ It offers a self-cleaning,
✅ Cosine-corrected head that is fully-potted for a waterproof design.
✅ Full-spectrum sensors

The SQ-500 is a self-powered, analog full-spectrum quantum sensor with a 0 to 40 mV output. The sensor incorporates a blue-enhanced silicon photodiode and custom optical filters with a rugged, self-cleaning sensor housing design, anodized aluminum body with acrylic diffuser, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. Typical applications include PPFD 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.

The analog version of this sensor (SQ-500) comes with the inline cable connector placed 30 cm from the sensor head for either standard use as a long-cable pigtail sensor, or for use with our microCache Bluetooth Micro Logger by unscrewing the connector, discarding the long section of cable and then screwing the sensor to the mating connector on the microCache.





General Specification



100 g


24 mm diameter, 37 mm height

Measurement Range

0 to 4000 µmol mˉ² sˉ¹


0.01 mV per µmol mˉ² sˉ¹

Operating Temperature

-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m

Temperature Response

-0.11 ± 0.04 % per C

Cable Length

5 m of shielded, twisted-pair wire with TPR jacket (high water resistance, high UV stability, flexibility in cold conditions)

Field Of View


Protection Level



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