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SQ-500-SS: Full-Spectrum Quantum Sensor

Updated:2025-03-13

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  • Brand: Apogee
  • Model: SQ-500-SS
  • Description: The SQ-500 is a self-powered, analog full-spectrum quantum sensor with a 0 to 40 mV output. The sensor incorporates an enhanced silicon photodiode and custom optical filters with a rugged, self-cleani
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Product Details

SQ-500-SS: Full-Spectrum Quantum Sensor

User 's Manual

The SQ-500 is a self-powered, analog full-spectrum quantum sensor with a 0 to 40 mV output. The sensor incorporates an enhanced silicon photodiode and custom optical filters with a rugged, self-cleaning sensor housing design, anodized aluminum body with acrylic diffuser, and an 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. 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.









SQ-500-SS specification:

Power Supply Self-powered
Output (Sensitivity) 0.01 mV per μmol mˉ2 sˉ1
Calibration Factor (Reciprocal of Sensitivty) 100 μmol mˉ2 sˉ1 per mV
Calibration Uncertainty ± 5 %
Calibrated Output Range 0 to 40 mV
Measurement Range 0 to 4000 μmol mˉ2 sˉ1
Measurement Repeatability Less than 0.5 %
Long-term Drift Less than 2 % per year
Non-linearity Less than 1 % (up to 4000 μmol mˉ2 sˉ1)
Response Time Less than 1 ms
Field of View 180?
Spectral Range 389 to 692 nm ± 5 nm (wavelegths where response is greater than 50 % of maximum)
Spectral Selectivity Less than 10 % from 412 to 682 nm ± 5 nm
Directional (Cosine) Response ± 5 % at 75? zenith angle
Azimuth Error Less than 0.5 %
Tilt Error Less than 0.5 %
Temperature Response -0.11 ± 0.04 % per C
Uncertainty in Daily Total Less than 5 %
Detector Blue-enhanced silicon photodiode
Housing Anodized aluminum body with acrylic diffuser
IP Rating IP68
Operating Environment -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m
Dimensions 24 mm diameter, 37 mm height
Mass 100 g (with 5 m of lead wire)
Cable 5 m of shielded, twisted-pair wire with TPR jacket (high water resistance, high UV stability, flexibility in cold conditions)
Warranty 4 years against defects in materials and workmanship
Manufactured Made in the USA

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