Apogee Full-spectrum Quantum Meter (Mq-501)

TYPICAL APPLICATIONS

•Incoming and reflected PPFD over and

under plant canopies in greenhouses, in

fields, and in growth chambers

•Aquatic environments including salt

water aquariums and freshwater lakes

and streams

UNIQUE DESIGN

Measure photosynthetically active radiation with a research grade, full-spectral response sensor. Offers a self-cleaning, cosine-corrected head to minimize errors and is fully-potted for a waterproof design.

ACCURATE, STABLE MEASUREMENTS

Long-term non-stability determined from multiple replicate quantum sensors in accelerated aging tests and field conditions is less than 2 % per year.

CALIBRATION TRACEABILITY

Apogee SQ-500 sensors are calibrated through side-by-side comparison to the mean of four transfer standard sensors under T5 cool white fluorescent lamps. The transfer standard sensors are calibrated through side-by-side comparison to the mean of at least four quantum sensors under T5 cool white fluorescent lamps traceable to the National Institute of Standards and Technology (NIST).

SPECTRAL ERRORS OF COMMERCIAL QUANTUM SENSORS

Spectral errors are theoretical errors calculated from sensor spectral responses and spectral output of radiation sources. Only spectral errors are listed in the table. Calibration, cosine, and temperature error can also contribute to measurement error.