Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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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.
| 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 |
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