The new SQ-420X smart quantum sensor can be connected directly to a computer (Windows or macOS X) 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.
Resolution0.1 µmol mˉ² sˉ¹Calibration FactorCustom for each sensor and stored in the firmwareCalibration Uncertainty± 5 %Measurement RepeatabilityLess than 0.5 %Non-stability (Long-term Drift)Less than 2 % per yearNon-linearityLess than 1 % (up to 4000 µmol mˉ² sˉ¹)Response TimeSoftware updates every secondField of View180˚Spectral Range370 nm to 650 nm (wavelegnths where response is greater than 50% of maximum)Directional (Cosine) Response± 5 % at 75˚ zenith angleTemperature Response-0.04 % per COperating Environment10 to 60 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 mDimensions24 mm diameter, 33 mm heightMassSensor head weighs 90 gUSB Cable4.5 m (15 ft)Current Draw61 mAWarranty4 years against defect in materials and workmanshipManufacturedMade in the USA
