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Original factory packaging
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Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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User's Manual
The SQ-204X-SS is an amplified original quantum sensor with a 4 to 20 mA output. The sensor was designed for use in environments with significant background electrical noise that can be found in many industrial applications. The sensor features a rugged, self-cleaning sensor housing design, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. Typical applications include PPFD (Photosynthetic Photon Flux Density) 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 (Photosynthetically Active Radiation)/PPFD in aquatic environments, including salt water aquariums where corals are grown. Sensor includes IP68 marine-grade stainless-steel cable connector to simplify sensor removal and replacement for maintenance and recalibration.
| Power Supply | 7 to 24 V DC with a maximum current draw 22 mA (2 mA quiescent current draw) |
| Sensitivity | 0.004 mA per μmol mˉ2 sˉ1 |
| Calibration Factor | 250 μmol mˉ2 sˉ1 per mA |
| Calibration Uncertainty | ± 5 % |
| Calibrated Output Range | 4 to 20 mA |
| Measurement Repeatability | Less than 0.5 % |
| Non-stability (Long-term Drift) | Less than 2 % per year |
| Non-linearity | Less than 1 % (up to 4000 μmol mˉ2 sˉ1) |
| Response Time | Less than 1 ms |
| Field of View | 180? |
| Spectral Range | 370 nm to 650 nm (wavelengths where response is greater than 50 % of maximum) |
| Directional (Cosine) Response | ± 5 % at 75? zenith angle |
| Temperature Response | Less than 0.5 % from -20 to 50 C |
| Operating Environment | -20 to 60 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 (with 5 m of cable) | 140 g |
| Cable | 5 m of shielded, twisted-pair wire. TPR jacket (high water resistance, high UV stability, flexibility in cold conditions). Pigtail lead wires |
| Warranty | 4 years against defects in materials and workmanship |
| Manufactured | Made in the USA |
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