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

Updated:2025-03-13

Brand: Apogee
Model: SQ-522-SS
Description: 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
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Product Details

Overview of SQ-522-SS Modbus Digital Output Full-spectrum Quantum Sensor：

User's Manual

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, 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.

SQ-522-SS Sensor Drawing：

Specifications of SQ-522-SS:

Input Voltage Requirement	5.5 to 24 V DC
Average Max Current Draw	RS-232 37 mA; RS-485 quiescent 37 mA, active 42 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; TPR jacket; pigtail lead wires; stainless steel (316), M8 connector
Warranty	4 years against defects in materials and workmanship
Manufactured	Made in the USA