Apogee SQ-520 Quantum Sensor with USB output

Product no.: 118462

The new SQ-520 smart quantum sensor can be connected directly to a computer for taking spot measurements or graphing and datalogging real-time PPFD using the included software. The sensor can also act as a stand-alone PAR datalogger by simply connecting it to any standard 5 V DC USB power plug. Internal memory within the sensor head is capable of storing 10,000 user-specified periodic measurements that can be downloaded as a CSV file to a computer for analysis.

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.
Spectral Response

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 Apogee 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.
Internal Data Storage
The sensor has internal data storage capability with the ability to hold up to 10,000 measurements. This allows the sensor to collect data while connected to a stand-alone 5 V DC power supply such as a USB wall adapter.


0.1 µmol m-2 s-1
Calibration Factor
Custom for each sensor and stored in the firmware
Calibration Uncertainty
± 5 %
Measurement Repeatability
Less than 1 % up to 4000 µmol m-2 s-1
Long-term Drift
Less than 2 % per year
Less than 1 % (up to 4000 µmol m-2s-1)
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 ° zenith angle, ± 5 at 75 ° zeith angle
Azimuth Error
Less than 0.5 %
Tilt Error
Less than 0.5 %
Temperature Response
-0.11 ± 0.03 % C-1
Uncertainty in Daily Total
Less than 5 %
Blue-enhanced silicon photodiode
Anodized aluminum body with acrylic diffuser
IP Rating
Operating Environment
-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m
24 mm diameter, 37 mm height
USB Cable
4.6 m (15 ft)
Sensor head weighs 90 g
Current Draw (when Logging)
2.1 mA

564,40 EUR

If you pay by in advance you get 3% discount
You save 16.93 EUR

16 % VAT incl. excl. Shipping costs

Shipping time:after individual aggreement

Ab 24 € /Monat

Customer reviews: