SQ-521-SS SDI-12 Digital Output Full-spectrum Quantum Sensor

$442.00

The SQ-521 is a digital sensor with SDI-12 communication protocol. The sensor incorporates a rugged, self-cleaning sensor housing design, anodized aluminum body with acrylic diffuser. 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.

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The SQ-521 is a digital sensor with SDI-12 communication protocol. The sensor incorporates a rugged, self-cleaning sensor housing design, anodized aluminum body with acrylic diffuser. 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.

Determining Grow Light Position Using a PAR Meter
Full-spectrum quantum sensor used to measure the PPFD output of grow lights to create PAR intensity maps of a grow area. The PAR intensity map is then used to determine how far the grow lights should be positioned from the crop for maximum yield.

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Input Voltage Requirement 4.5 to 24 V DC Current Drain 0.6 mA (quiescent), 1.3 mA (active) Calibration Uncertainty ± 5 % Measurement Repeatability Less than 1 % (up to 4000 µmol mˉ² sˉ¹>) Non-stability (Long-term Drift) Less than 2 % per year Non-linearity Less than 1% (up to 4000 µmol mˉ² sˉ ¹) Response Time 0.6 s, time for detector signal to reach 95 % following a step change, fastest data transmission rate for SDI-12 circuitry is 1 s Field of View 180 ˚ Spectral Range 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum) Spectral Selectivity Less than 10 % from 412 to 682 nm ± 5 nm Directional (Cosine) Response ± 2 % at 45 ˚, ± 5 % at 75 ˚ 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 45 mm height, 23.5 mm diameter Mass 100 g Cable 5 m of two conductor, shielded, twisted-pair wire; additional cable available in multiples of 5 m; santoprene rubber jacket; pigtail lead wires