The MQ-500 has a hand-held meter, attached via cable, that displays and stores measurements. The sensor incorporates a blue-enhanced silicon photodiode and custom optical filters with a rugged, self-cleaning sensor housing design, anodized aluminum body with acrylic diffuser. Typical applications include PPFD measurement over plant canopies in outdoor environments, greenhouses, and growth chambers, and reflected or under-canopy (transmitted) PPFD measurements in the same environments. Quantum sensors are also used to measure PAR/PPFD in aquatic environments, including salt water aquariums where corals are grown.
The meter has a sample and log mode, and will record an integrated daily total in mol m-2 d-1. Sample mode will record up to 99 manual measurements. Log mode will power the meter on/off to make a measurement every 30 seconds. Every 30 minutes the meter will average the sixty 30 second measurements and record the averaged value to memory. The meter can store up to 99 averages, once full it will start to overwrite the oldest measurement with new ones. An integrated daily total will be recorded from the 48 averaged measurements (making a 24 hr period). Sample and log measurements can be reviewed on the LCD display or by downloading the data to a computer, however, the integrated daily total can only be viewed by downloading the data to a computer. Downloading data to a computer requires the AC-100 communication cable (a standard USB cable will not work) and ApogeeAMS software.
How is the MQ-510 different
from previous Apogee quantum sensors?
The MQ-510 performs exactly the same underwater as the MQ-500, but the MQ-510 simply multiplies the PAR reading by 1.32 to account for the immersion effect. The MQ-510 is a full-spectrum quantum sensor (SQ/MQ-500 Series) with a spectral range of 389 to 692 nm ± 5 nm, which can be seen in the graph below. This improved spectral respose increases the acuracy of LED measurements.
± 5 %
0 to 4000 µmol m-2 s-1
Less than 0.05 %
Long-term Drift (Non-stability)
Less than 2 % per year
Less than 1 % (up to 4000 µmol m-2 s-1)
Less than 1 ms
389 to 692 nm ± 5 nm ( wavelengths where responsis greater than 50 %)
Less than 10 % from 412 to 682 nm ± 5 nm
Directional (Cosine) Error
Less than ± 5 % at 75° zenith anglean 10 % from 412 to 682 nm ± 5 nm
Less than 0.5 %
Less than 0.5 %
-0.11 ± 0.04 % C-1
Uncertainty in Daily Totals
Less than 5 %
Blue-enhanced silicon photodiode
Anodized aluminum body with acrylic diffuser
0 to 50 C; less than 90 % non-condesing relative humidity up to 30 C; less than 70 % non-condensing relative humidity from 30 to 50 C; separate sensors can be submerged in water up to depths of 30 m
126 mm length; 70 mm width; 24 mm eight
24 mm diameter; 37 mm height
2 m of two conductor, shielded, twisted-pair wire; addititonal cable wire available; santoprene rubber jacket