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MQ-501: Handheld Full-spectrum Quantum Meter

Updated:2025-03-13

Brand: Apogee
Model: MQ-501
Description: 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 o
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Product Details

Overview of MQ-501 hand-held full spectrum quantum meter:

User 's Manual

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.

MQ-501 drawing:

MQ-501 specification:

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