Updated:2022-12-27
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MQ-501 is designed as an easy to use hand-held instrument for spot check and measurement. The instrument includes AM-001 instrument mounting bracket for mounting the sensor on the horizontal surface of the instrument, and approximately 0.17 m of cable to accommodate the length of the bracket. The full spectrum sensor adopts blue enhanced silicon photodiode and customized filter, with a solid self-cleaning sensor housing design, anodized aluminum body and acrylic diffuser. Typical applications include PPFD measurement of plant canopy in outdoor environment, greenhouse and growth chamber, and PPFD measurement of reflection or under canopy (transmission) in the same environment.
The instrument has sampling and logging modes and will record in mol m ˉ² d ˉ¹ Is the comprehensive daily total amount in units. The sampling mode will record up to 99 manual measurements. The logging mode will turn the instrument on/off and take measurements every 30 seconds. Every 30 minutes, the instrument will average 60 30 second measurements and record the average value into memory. The instrument can store up to 99 average values. Once it is full, it will begin to overwrite the old measured values with new ones. The combined daily total will be recorded from 48 average measurements (over a 24-hour period). The sample and log measurements can be viewed on the LCD screen or by downloading data to the computer, but the combined daily totals can only be viewed by downloading data to the computer. AC-100 communication cable (standard USB cable does not work) and Apogee AMS software are required to download data to the computer.
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) |
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 ℃, less than 90 % non-condensing relative humidity up to 30 C, less than 70 % non-condensing relative humidity from 30 to 50 ℃, 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 | 180 g |
Cable | Approximately 0.17 m of shielded, twisted-pair wire with TPR jacket (high water resistance, high UV stability, flexibility in cold conditions) |
Warranty | 4 years against defects in materials and workmanship |
Manufactured | Made in the USA |
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