Updated:2022-12-22
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SQ-520 full spectrum quantum USB sensor is used to accurately measure photosynthetically active radiation (PAR) of light source.
High quality quantum sensor: this sensor has a laboratory level PPFD (photosynthetic photon flux density) or a precisely calibrated "quantum" optical detector, which can measure the light intensity of specific color wavelengths emitted by LED, HPS, MH, sunlight and other light sources for photosynthesis of plants.
USB compatibility: The intelligent quantum sensor can be directly connected to a computer (Windows or macOS X), and the accompanying Apogee Connect software can be used for on-site measurement or real-time PPFD of mapping and data recording. The sensor can also be used as an independent PAR data recorder by connecting it to most standard 5 V DC USB power plugs.
Accuracy and stability: The sensor accurately measures and combines the intensity of all photons between 400 and 700 nm, giving a single PAR reading in µmol mˉ² sˉ¹ with an uncertainty of 5%. It has stable and accurate calibration, and the annual precision drift rate is less than 2%.
Robust and easy to use: Quantum sensor heads are made of machined aluminum and encapsulated with epoxy resin, which can be used for many years in harsh environments, including underwater. The internal memory in the sensor head can store 10000 periodic measurement values specified by the user, which can be downloaded to the computer as CSV files for analysis
Resolution | 0.1 µmol mˉ² sˉ¹ |
Calibration Factor | Custom for each sensor and stored in the firmware |
Calibration Uncertainty | ± 5 % |
Measurement Repeatability | Less than 1 % up to 4000 µmol mˉ² sˉ¹ |
Long-term Drift | Less than 2 % per year |
Non-linearity | Less than 1 % (up to 4000 µmol mˉ² sˉ¹) |
Response Time | Software updates every second |
Field of View | 180˚ |
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 ˚ |
Azimuth Error | Less than 0.5 % |
Tilt Error | Less than 0.5 % |
Temperature Response | -0.11 ± 0.04 % ℃ˉ¹ |
Uncertainty in Daily Total | Less than 5 % |
Detector | Blue-enhanced silicon photodiode |
Housing | Anodized aluminum body with acrylic diffuser |
IP Rating | IP68 |
Operating Environment | -40 to 70 ℃; 0 to 100 % relative humidity; can be submerged to depths of 30 m |
Dimensions | 24 mm diameter, 37 mm height |
USB Cable | 4.5 m (15 ft) |
Mass | 100 g (with 5 m of lead wire) |
Current Draw | 61 mA |
Warranty | 4 years against defects in materials and workmanship |
Manufactured | Made in the USA |
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