Pm2.5 detector operating mechanism Membrane dust measurement. The principle of dust measurement is to use a dust sampler (or a respiratory dust sampler) to collect a certain volume of dust-laden air. When the dust-laden air passes through the membrane, the dust is trapped on the filter membrane and the weight of the filter membrane is calculated. Dust concentration. The pm2.5 sensor uses the principle of laser scattering. That is, the laser light is scattered on the suspended particles in the air, and the scattered light is collected at a certain angle to obtain the curve of the scattered light intensity with time. After the microprocessor acquires the data, the relationship between the time domain and the frequency domain is obtained by Fourier transform. Subsequently, a series of complex algorithms are used to obtain the equivalent particle size of the particles and the number of particles of different particle sizes within the unit volume. The pm2.5 detector detects detectors with a particle size of less than 2.5 μm in the atmosphere. The basic principle is that after the laser is scattered by the dust particles, digital signal processing is performed on the pulse signal output by the optical sensor, and the measurement parameters are set. The result display, keys, time and date are all controlled and implemented by a built-in microcomputer (MCU). A dedicated laser module generates a specific laser beam. When the particles pass, their signals are detected by ultra-sensitive digital circuit modules. The particle count and particle size are obtained through intelligent identification analysis of the signal data, according to the professional calibration. The technique yields a particle size distribution and mass concentration conversion formula that ultimately yields a uniform mass concentration . It can detect and analyze two particle size files (0.3, 2.5) at the same time. The default measurement setting of the instrument is the front, that is, the user will take the instrument to the air inlet and measure the number of dust particles in the unit volume automatically after 20 seconds. After the setting, the user takes the instrument to the outlet for 20 seconds. After the measurement, the cleaning efficiency is automatically calculated based on the number of dust particles that are measured at the inlet and outlet. The user only needs to measure the air inlet and outlet of the air purifier separately with this instrument. It can accurately reflect the number of particles before and after the purification and calculate the percentage of the purification efficiency. Therefore, this instrument is very practical for air purification. Analyzer purification effect analysis and detection. The air purifier purification efficiency detector is mainly an imported high-sensitivity, high-resolution, high-stability dust particle analysis sensor and high-precision sampling pump. It is an important part of the air purifier purification efficiency detector. It collects data through a sampling pump, and then carries out detection and analysis through the sensor. Then, the analyzed data is reflected on the LCD screen in real time. SDC2501 PM2.5 detector, real-time monitoring of PM2.5 particle concentration in the air . Imported sensors abroad, reliable data. PC- side and iPhone/iPad- side professional software draw the dynamic curve of PM2.5 in real time . Professional quality: foreign imports of sensors, reliable data, ease of use; Real-time monitoring: 24 hours monitoring, pay attention to the surrounding environment in order to take effective protective measures; Intuitive numerical display, simple and convenient operation; Small and convenient, easy to carry; Data storage: can store the last 24 hours of data, and transfer the data to the computer via USB ; Dynamic curve: Connect to computer or connect IOS system through bluetooth to draw the dynamic curve of PM2.5 in real time .
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Pm2.5 detector operating mechanism