The SQ-522-SS sensor outputs a digital signal using Modbus RTU protocol over RS-232 or RS-485. 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.
Input Voltage Requirement： 5.5 to 24 V DC
Average Max Current Draw： RS-232 quiescent 36.87 mA, active 37.06 mA; RS-485 quiescent 37.37 mA, active 42.30 mA
Calibration Uncertainty： ± 5 %
Measurement Repeatability： Less than 1 %
Long-term Drift： Less than 2 % per year
Non-linearity： Less than 1% (up to 4000 µmol mˉ² sˉ ¹)
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˚ zenith angle
Temperature Response： -0.11 ± 0.04 % per C
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 (5 m of cable)： 140 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
Warranty： 4 years against defects in materials and workmanship
