SQ-420 Smart Quantum Sensor | USB Output

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.

  • Product Name:Smart Quantum Sensor | USB Output
  • Item No.:SQ-420
  • Manufacturers:Apogee
  • Country of Origin:USA

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.


Independent Calibration

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.


Software Overview

SQ-420-software.jpg

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