The MQ-200X has a hand-held meter, attached via cable, that displays and stores measurements. The sensor head features a fully potted, domed-shaped design making it fully waterproof, weatherproof and self-cleaning. 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.
For instructions on how to use the meter for underwater measurements, see this page for the immersion effect correction factor.
Calibration Uncertainty± 5 %Measurement RepeatabilityLess than 1 %Non-stability (Long-term Drift)Less than 2 % per yearNon-linearityLess than 1 % (up to 4000 µmol mˉ² sˉ¹ )Response TimeLess than 1 msField of View180˚Spectral Range370 nm to 650 nm (wavelengths where response is greater than 50 % of maximum)Directional (Cosine) Response± 5 % at 75˚ zenith angleTemperature Response-0.04 % per COperating Environment0 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 depths of 30 mMeter Dimensions126 mm length, 70 mm width, 24 mm heightSensor Dimensions24 mm diameter, 28 mm heightMass180 gCable2 m of shielded, twisted-pair wire with TPR jacket (high water resistance, high UV stability, flexibility in cold conditions), additional cable availableWarranty4 years against defects in materials and workmanshipManufacturedMade in the USA