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 software. The sensor can also act as a stand-alone PAR datalogger by simply connecting it to most standard 5 V DC USB power plugs. 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.
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 Apogee software (windows compatible, XP and later; Mac compatible, 10.10 and later). The included ApogeeConnect 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 most stand-alone 5 V DC power supply such as a USB wall adapter.
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 % Cˉ¹
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 C; 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