The product complies with HJ 653-2021 Technical Requirements and Detection Methods for Continuous Automatic Monitoring Systems for Ambient Air Particulate Matter (PM10 and PM2.5).
Instrument Principle
β rays are high-speed electrons. When they penetrate a substance, part of them is absorbed, causing intensity attenuation. Under certain conditions, the amount of attenuation depends only on the mass of the absorbing substance and is independent of other physical properties of the absorbing substance (such as particulate material, color, gloss, shape, etc.), allowing direct measurement of atmospheric particulate mass concentration. This instrument uses low-energy ¹⁴C as the β ray source. The rays pass twice through clean filter paper and filter paper with collected particulates before and after collection. Based on the change in beta ray absorption, the mass of particulates is calculated using the Lambert-Beer law.
Application Scope
TH-2000PM (portable) Atmospheric Particulate Matter Concentration Monitor is a new instrument developed by our company in accordance with the latest standards of the Ministry of Environmental Protection. Based on the beta ray principle and equipped with different sampling cutters, it can monitor TSP, PM10, PM2.5, PM1 concentrations in ambient air over the long term. It is mainly used for grid-based monitoring, construction site dust monitoring, portable air automatic stations, and rapid and accurate determination of particulate matter concentrations in environmental enforcement work.
Instrument Features
• During sampling, the instrument intelligently and dynamically heats the collected sample gas to reduce the impact of sample gas humidity on monitored concentration;
• The sampling structure adopts a straight-through design to avoid the influence of dust accumulation in the gas path on measurement results;
• Flow measurement uses digital sensors, and the control section employs PID precise control regulating valve for high flow stability and accuracy;
• High-performance embedded real-time system for data acquisition and processing, featuring high stability, high reliability, and strong real-time performance;
• Massive historical data storage space (at least one year), with U-disk support for copying historical data and instrument status information;
• 7-inch full-touch screen with Chinese interactive interface, simple and convenient operation, auto-start on incoming power;
• The instrument is safe and stable, using a low-density, low-activity, long half-life (5700 years) ¹⁴C β source;
• Optional GPRS communication module, enabling mobile APP query and providing an environmental quality query service platform;
• Instrument can be optionally equipped with wind direction and speed monitoring system, GPS positioning, and noise monitoring system;
• The instrument can be placed outdoors long-term, with sealed enclosure that is waterproof and dustproof.
