SQ-522-SS Modbus Digital Output Full-spectrum Quantum Sensor

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 acryli

  • Product Name:SQ-522-SS Modbus Digital Output Full-spectrum Quantum Sensor
  • Item No.:SQ-522-SS
  • Manufacturers:Apogee
  • Country of Origin:USA

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