Apogee USB Smart Quantum Sensor (Sq-420x)

ACCURATE, STABLE MEASUREMENTS

Cosine-corrected with directional errors less than ± 5 % at a solar zenith angle of 75°. Long-term non-stability less than 2 % per year.

SPECTRAL RESPONSE

Original X quantum sensors work well for broadband sources (sun, high pressure sodium, metal halide, cool white fluorescent lamps).

INTERNAL DATA STORAGE

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 USB power sources.

NO DATALOGGER REQUIRED

Sensor can be connected to a desktop, laptop, or tablet computer via a USB 2.0 type A plug. The ApogeeConnect software gives the user control of data logging and calibration settings, provides real time output display and graph of PPFD measurements, and allows the data set to be saved as a csv file for further analysis.

INDEPENDENT CALIBRATION

The SQ-420X 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.

CALIBRATION TRACEABILITY

Apogee SQ X sensors are calibrated through side-by-side comparison to the mean of four transfer standard sensors under a reference lamp. The reference sensors are recalibrated with a quartz halogen lamp traceable to the National Institute of Standards and Technology (NIST).