Common Methods of Detection for Systems for the Detection of Toxic and Noxious Gases
The application of toxic gas detectors in industry divides toxic and harmful gases into two categories based on their hazards: combustible gases and toxic gases. Due to their different properties and hazards, their detection methods also vary. Toxic gases can exist in production materials and can be detected by toxic gas detectors. Like most organic chemicals (VOCs), they may also exist as by-products in various stages of the production process, such as ammonia, carbon monoxide, hydrogen sulfide, and so on. They are the most hazardous factors to workers. This kind of harm not only includes immediate harm, such as physical discomfort, illness, death, etc., but also includes long-term harm to the human body, such as disability, cancer, etc. The detection of these toxic and harmful gases is an issue that developing countries should start to pay full attention to. The TWA (8-hour statistical weighted average), STEL (15 minute short-term exposure level), IDLH (immediate lethal dose) (ppm), and MAC (maximum allowable concentration in the workshop) mg/m3 of common toxic and harmful gases. Depending on the type of gas, the TWA, STEL, IDLH, MAC values may vary to some extent. Currently, for the detection of specific toxic gases, we commonly use specialized gas sensors. It can include the above. All gas sensors listed, including the photoionization detector introduced in the previous two chapters. Among them, the method for detecting inorganic gases that is relatively common, technologically mature, and has comprehensive indicators is the constant potential electrolysis method, which is commonly known as electrochemical sensors. At present, we attach great importance to the detection of gases that can cause acute poisoning, such as hydrogen sulfide and hydrogen cyanide. However, we do not pay enough attention to the detection of gases that can cause chronic poisoning, such as aromatic hydrocarbons and alcohols. In fact, the latter poses no less harm to the health and safety of workers than gases that can cause acute poisoning! They may cause cancer and other hidden diseases, affecting the lifespan and health of workers. The emergence of this phenomenon is not only due to cognitive reasons, but also due to the lack of suitable organic gas detectors that can detect lower concentrations in the market in the past. With the development of science and technology and the improvement of people's health awareness, people are no longer satisfied with just "coming to work happily and going home safely", but are pursuing higher quality of life and living conditions. People not only care about today's work, but also about tomorrow - their life after retirement. Therefore, the use of toxic gas detectors in industrial hygiene and safety work to protect personnel safety requires continuous introduction of new concepts and ideas in order not only to avoid immediate dangers, but also to pay attention to avoiding future tragedies. All of these need to be continuously improved and enhanced through the formulation of regulations and the improvement of people's quality.
