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SQ-512-SS: Amplified 0-2.5 V Full-Spectrum Quantum Sensor

Updated:2025-03-13

Brand: Apogee
Model: SQ-512-SS
Description: The SQ-512 is an amplified full-spectrum quantum sensor with a 0 to 2.5 V output. The sensor incorporates a blue-enhanced silicon photodiode and custom optical filters with a rugged, self-cleaning sen
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Product Details

SQ-512-SS: Amplified 0-2.5 V Full-Spectrum Quantum Sensor

User 's Manual

The SQ-512 is an amplified full-spectrum quantum sensor with a 0 to 2.5 V 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.

SQ-512-SS drawing:

SQ-512-SS specification:

Power Supply	5 to 24 V DC
Current Draw	at 12 V is 57 μA
Output (Sensitivity)	0.625 mV per μmol mˉ2 sˉ1
Calibration Factor (Reciprocal of Sensitivty)	1.6 μmol mˉ2 sˉ1 per mV
Calibration Uncertainty	± 5 %
Calibrated Output Range	0 to 2.5 V
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 % Cˉ1
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	30.5 mm diameter, 37 mm height
Mass (with 5 m of cable)	140 g
Cable	5 m of two conductor, shielded, twisted-pair wire; TPR jacket; pigtail lead wires; stainless steel (316), M8 connector
Warranty	4 years against defects in materials and workmanship
Manufactured	Made in the USA