Air quality has always been a topic of constant concern. However, everyone pays more attention to air pollution, while ignoring the potential hazards of subway air.
air quality in the subway
Most subways are built deep underground, and the stations are connected by a complex tunnel system, which is a relatively closed space. The air exchange between the subway station and the outside world can only be carried out through the station entrance and exit and the limited tunnel ventilation shaft.
Some data show that when the population density increases in the morning and evening peaks, 5 million small particles can be produced every minute, such as falling skin flakes, sneezing droplets, fibers on clothes, dust on the soles, etc., which may be destroyed at any time. People inhale.
The highly dense crowds in the station release a lot of odor and carbon dioxide. In addition, the subway environment is humid and hot, and there is no sunlight, which is conducive to the survival of microorganisms or the spread of pathogenic microorganisms. When people with different health levels gather and flow, it is easy to cause the spread and spread of tuberculosis, influenza virus, skin diseases, dysentery and other diseases.
Although my country’s current air quality standards for public transportation are not perfect. “Public Transport Hygiene Standard (GB9673-1996)” and “Public Transport Waiting Room Hygiene Standard (GB9672-1996)” were issued more than 20 years ago and have now been abolished. The “Indoor Air Quality Standard (GB/T18883-2002)” is mainly aimed at the management of residential and office environments, and pays more attention to physical and chemical indicators, such as ozone and other indicators, which are different from public transportation environments, so they are not fully applicable.
In order to facilitate real-time monitoring of air quality in subway stations, SenTec independently developed a multi-functional air quality sensor.
why choose SEM230 air quality sensor ?
The multi-function air quality sensor (SEM230) is a multi-element air environment sensor. It adopts electrochemical and catalytic combustion sensor principles. It can be used to detect temperature, humidity, PM2.5, PM10, atmospheric pressure, light, TVOC in the air environment. , carbon monoxide, carbon dioxide, ozone, methane, oxygen, sulfur dioxide, nitrogen dioxide, hydrogen, hydrogen sulfide, ammonia and other elements, basically covering various indicators reflecting air quality.
During its use, the multifunctional air quality sensor can monitor eleven environmental elements at the same time, and can select at most eight from ten environmental elements such as temperature, humidity, PM2.5, PM10, atmospheric pressure, light, TVOC, CO2, and O3. These elements are used for monitoring with three gases including CO, CH4, O2, SO2, NO2, H2, H2S, and NH3.
air quality sensor features
The sensor adopts imported sensor and control chip, which has the characteristics of high precision, high resolution and good stability. Dual-frequency data acquisition and automatic locking technology, PM2.5 and PM10 are collected at the same time, and the consistency can reach ±10%; the TVOC measurement unit adopts imported high-sensitivity gas detection head, the technology is mature, and uses high-performance signal acquisition circuit, signal High stability and accuracy. High pressure range, wide range of 0-120Kpa pressure range, can be applied to various altitudes. According to the different installation positions of the base, there are two ways: wall-mounted and ceiling-mounted.
in conclusion
Multifunctional air quality sensors can not only be used in subway stations, but also widely used in building HVAC, building energy conservation, smart homes, schools, hospitals, airport stations and other places.
