Method for giving alarm on out-of-limit concentration of inhalable particulate matter (PM) in air

Abstract

The invention discloses a method for giving an alarm on the out-of-limit concentration of inhalable particulate matter (PM) in the air. The method is characterized by comprising the steps of collecting quantitative air to be detected, and enabling the collected air to pass through an elastic filter membrane, wherein the filter membrane is capable of collecting PM2.5 of the sample air, a light conductive sheet is adhered to the central position of the lower part of the elastic filter membrane, and the filter membrane arranged along the transverse direction deforms downwards under the action of gravity in the PM2.5 collection process; arranging two metal plates at certain height under the filter membrane, wherein the distance between the metal plates is slightly smaller than the width of the metal sheet; enabling one ends of the two metal plates to be respectively connected into an alarm circuit; and after the filter membrane is in contact with the metal plates, alarming to indicate that the content of PM 2.5 in the air to be detected exceeds the standard. After the method is adopted, alarming is carried out when the concentration of inhalable PM in the air in a room exceeds the limiting value under the condition of daily standard; furthermore, the method has the advantages of being simple in implementation, low in cost, sensitive and reliable in detection, etc.

Description

technical field [0001] The invention relates to the technical field of air pollutant monitoring; in particular, it relates to a new method for real-time monitoring and alarming of the concentration of inhalable particulate matter in indoor air. [0002] Background technique [0003] With the advancement of industrialization and the improvement of people's living standards, environmental issues, especially air quality issues, have increasingly attracted people's attention. In the winter of 2011, severe smog occurred in northern my country, which did great harm to people's healthy life. The main reason for the formation of smog is the high concentration of inhalable particulate matter in the air. Inhalable particulate matter refers to the particulate matter in the atmosphere with a diameter less than or equal to 10 μm. Particles with a diameter of less than 2.5 μm are more harmful to the human body. They can directly invade the alveoli of the human body, and can also enter t...

AI Technical Summary

Problems solved by technology

This design scheme uses a complete analytical balance as part of the device for accurate weight measurement, but the analytical balance is a precision measuring instrument with an average price of more than 10,000 yuan, which makes the device itself extremely expensive and difficult to popularize for civilian use

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