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SQ-520 Full Spectrum Intelligent Quantum Sensor (USB)

Updated:2025-03-13

Brand: APOGEE
Model: SQ-520
Description: SQ-520 full spectrum quantum USB sensor is used to accurately measure PAR from all light sources. With laboratory level PPFD (photosynthetic photon flux density) or accurately calibrated "quantum" opt
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Product Details

Overview of SQ-520 Full Spectrum Intelligent Quantum Sensor (USB)：

User's Manual

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

Drawing of SQ-520 Sensor:

Specifications of SQ-520 sensor:

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