The new SQ-420 smart quantum sensor can be connected directly to a computer for taking spot measurements or graphing and datalogging real-time PPFD using the included ApogeeConnect 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.
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.
No Datalogger Required
The sensor can be connected to a desktop or laptop 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.
The SQ-420 is calibrated independently for sunlight and electric light to improve measurement accuracy. The light source calibration can be selected in the settings menu of the Apogee software.
Resolution 0.1 µmol mˉ² sˉ¹
Calibration Factor Custom for each sensor and stored in the firmware
Calibration Uncertainty ± 5 %
Measurement Repeatability Less than 0.5 %
Non-stability (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 410 nm to 655 nm (wavelegnths where response is greater than 50% of maximum)
Spectral Selectivity Less than 10 % from 469 to 655 nm
Directional (Cosine) Response ± 5 % at 75˚ zenith angle
Temperature Response 0.06 ± 0.06 % per C
Operating Environment -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m
Dimensions 2 4 mm diameter, 28 mm height
Mass Sensor head weighs 90 g
USB Cable 4.5 m (15 ft)
Current Draw 61 mA
Warranty 4 years against defect in materials and workmanship