Confirm the type and concentration range of the gas to be tested: The types of gases encountered in each production department are different. All possible situations should be considered when selecting a gas detector. If methane and other less toxic alkanes are the most common, the LEL detector is the most suitable. This is not only because the LEL detector is simple in principle and widely used, but it also has the characteristics of convenient maintenance and calibration. If there are toxic gases such as carbon monoxide and hydrogen sulfide, it is necessary to select a specific gas detector to ensure the safety of workers. If there are more organic toxic and harmful gases, considering the lower concentration of people who may cause poisoning, such as aromatic hydrocarbons, halogenated hydrocarbons, ammonia (amines), ethers, alcohols, fats, etc., you should choose the light introduced in the previous chapter. Ionize the detector and never use the LEL detector, as this can cause casualties. If the gas type covers the above types of gases, choosing a compound gas detector may achieve twice the result with half the effort. Determine the use case: The type of gas detector is different depending on the industrial environment. A), fixed gas detection: This is the use of more detectors on industrial plants and in production processes. It can be installed at a specific inspection point to detect specific gas leaks. The fixed detector is generally two-piece type. The detection head consisting of sensor and transmission is integrated in the inspection site. The secondary instrument consisting of circuit, power supply and display alarm device is installed in a safe place for easy monitoring. Its detection principle is the same as that described in the previous section, but it is more suitable in the process and technology for the continuous and long-term stability required for fixed detection. They are also selected according to the type and concentration of the gas on site, and care should be taken to install them where the specific gas is most likely to leak, such as selecting the most effective height for sensor installation based on the specific gravity of the gas. B), portable gas detector: Because portable instruments are easy to operate and compact, they can be carried to different production sites. The electrochemical detectors are powered by alkaline batteries and can be used continuously for 1000 hours. The new LEL detectors, PID and composite instruments use rechargeable batteries (some have The use of non-memory hydrogen or helium-ion batteries makes them generally work continuously for nearly 12 hours, so the use of such instruments in various factories and health departments is becoming more widespread. If it is open, such as an open work shop using such instruments as a safety alarm, you can use a diffused gas detector that you wear, because it can display the concentration of toxic and harmful gases in the field continuously, in real time and accurately. Some of these new instruments are also equipped with vibration alarm accessories to avoid audible alarms in noisy environments, and computer chips are installed to record peaks, STEL (15-minute short-term exposure levels) and TWA (8-hour statistical weight average) ) Provide specific guidance for worker health and safety. If you enter a confined space, such as reaction tanks, storage tanks or containers, sewers or other underground pipelines, underground facilities, agricultural closed granaries, railway tankers, shipping cargo tanks, tunnels, etc., inspections must be carried out before personnel enters. And to test outside the confined space. In this case, you must select a multi-gas detector with a built-in sampling pump. Because the gas distribution and gas type of different parts (upper, middle, and lower) in the confined space are very different. For example, in general, the proportion of flammable gases is relatively light. Most of them are distributed in a confined space. The carbon monoxide and air have similar specific gravity. They are generally distributed in a confined space. The heavier gases such as hydrogen sulfide are trapped in the air. The lower part of the space. At the same time, the oxygen concentration is also one of the types that must be detected. In addition, a detector that can detect organic gases is also needed if one considers the volatilization and leakage of possible organic matter in the tank. Therefore, a complete confined space gas detector should be a built-in pumping function to enable non-contact, sub-site detection of multi-gas detection functions to detect different spatial distribution of hazardous gases, including inorganic gases and organic gases with oxygen detection. A portable instrument that prevents hypoxia or rich volume and does not affect workers' work. Only in this way can the absolute safety of the workers entering the confined space be guaranteed. In addition, after entering the confined space, the gas components therein should be continuously tested to avoid changes in the concentration of volatile organic compounds or other toxic and harmful gases caused by personnel entering, sudden leakage, and temperature changes. If used for emergency, leak detection and inspection, pumping, short response time, high sensitivity and high resolution instruments should be used to make it easy to determine the location of the leak. Concerned about surprises Label: How to choose a toxic and harmful gas detector Previous: Problems to be paid attention to when purchasing electric valve devices Next: Working principle and purchasing basis of electric valve devices Channel Drain Shower,Tile Insert Square Channel Drain,Anti Odor Stainless Steel Shower Drains,Tile Insert Adjustable Shower Kaiping City Jinqiang Hardware Products Co.,Ltd , https://www.jmpowerdrain.com
In the case of industrial hygiene testing and health surveys, it is very convenient to use instruments with data logging and statistical calculations and functions that can be connected to a computer. 