Important Info

The new SQ-520 full-spectrum, smart quantum sensor can be connected directly to a computer via USB for taking spot measurements or graphing and datalogging real-time PPFD using the included ApogeeConnect software.

Application

The SQ-520 is used to measure incoming and reflected PPFD around plants and other organisms in outdoor environments, greenhouses, growth chambers, and underwater.

Refined Spectral Response

The improved spectral response of the SQ-520 increases the accuracy of LED measurements making it ideal for use with both natural and electric light sources.

No Datalogger Required

The sensor can be connected to a desktop, laptop, or tablet computer via USB 2.0 type A plug to be used with the ApogeeConnect software (Windows compatible, XP and later; Mac compatible, 10.10 and later). The included software gives the user control of data logging and calibration settings, provides a real time output display and graph of PPFD measurements and allows the data set to be saved as a csv file

Specifications

• Resolution0.1 µmol m-2 s-1
• Calibration FactorCustom for each sensor and stored in the firmware
• Calibration Uncertainty± 5 %
• Measurement RepeatabilityLess than 1 % up to 4000 µmol m-2 s-1
• Long-term DriftLess than 2 % per year
• Non-linearityLess than 1 % (up to 4000 µmol m-2s-1)
• Response TimeSoftware updates every second
• Field of View180 °
• Spectral Range389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum)
• Spectral SelectivityLess than 10 % from 412 to 682 nm ± 5 nm
• Directional (Cosine) Response± 2 at 45 ° zenith angle, ± 5 at 75 ° zeith angle
• Azimuth ErrorLess than 0.5 %
• Tilt ErrorLess than 0.5 %
• Temperature Response-0.11 ± 0.03 % C-1
• Uncertainty in Daily TotalLess than 5 %
• DetectorBlue-enhanced silicon photodiode
• HousingAnodized aluminum body with acrylic diffuser
• IP RatingIP68
• Operating Environment-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m
• Dimensions24 mm diameter, 37 mm height
• USB Cable4.6 m (15 ft)
• MassSensor head weighs 90 g
• Current Draw11 mA
• Warranty4 years against defect in materials and workmanship