Apogee MQ500 Full Spectrum Quantum Meter


In stock (can be backordered)

SKU: MQ-500 Category: Tags: , , ,
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The MQ-500 quantum meter is the tool of choice for scientists all over the world to accurately measure photosynthetically active radiation from all light sources. It 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. Owners manual is here.

  • Calibration Uncertainty ± 5 %
  • Measurement Range 0 to 4000 µmol mˉ² sˉ¹
  • Measurement Repeatability Less than 0.5 %
  • Long-term Drift (Non-stability) Less than 2 % per year
  • Non-linearity Less than 1 % (up to 4000 µmol mˉ² sˉ¹)
  • Response Time Less than 1 ms
  • Field of View 180 ˚
  • Spectral Range 389 to 692 nm ± 5 nm (wavelengths where response is greater than 50 % of maximum)
  • Spectral Selectivity Less than 10 % from 412 to 682 nm ± 5 nm
  • Directional (Cosine) Response± 5 % at 75 ˚ zenith angle
  • Azimuth Error Less than 0.5 %
  • Tilt Error Less than 0.5 %
  • Temperature Response -0.11 ± 0.03 % Cˉ¹
  • Uncertainty in Daily Total Less than 5 %
  • Detector Blue-enhance silicon photodiode
  • Housing Anodized aluminum body with acrylic diffuser
  • IP Rating IP68
  • Operating Environment 0 to 50 C, less than 90 % non-condensing 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 depth of 30 m
  • Meter Dimensions 126 mm length, 70 mm width, 24 mm height
  • Sensor Dimensions 24 mm diameter, 37 mm height
  • Mass 100 g (with 5 m of lead wire)
  • Cable 2 m of shielded, twisted-pair wire with santoprene rubber jacket (high water resistance, high UV stability, flexibility in cold conditions), additional cable available
  • Warranty 4 years against defects in materials and workmanship

Additional information

Weight1 lbs
Dimensions7 × 7 × 5 in