Gas detectors are mainly used for the detection of toxic, harmful and flammable gases. The toxic gas detectors are used in coal mines, petroleum, chemical, gas transmission and distribution, biochemical medicine, agricultural pesticides, building materials, coking, building materials and other fields. There are applications.
For all kinds of different production occasions and testing requirements, the choice of a suitable gas detector is a must for every person engaged in safety and health work. Here we will introduce some specific conditions of the use of gas detectors for your reference.
1) The gas detector should first 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.
2) Determining the use situation: The type of gas detector is different depending on the industrial environment.
A) Fixed gas detector: This is a detector that is used more on industrial equipment and in the production process. 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.
3) Portable gas detector: Because the portable instrument is easy to operate and compact, it can be carried to different production sites. The electrochemical detector is powered by alkaline battery and can be used continuously for 1000 hours. The new LEL detector, PID and compound instrument Rechargeable batteries (some have used non-memory nickel-metal hydride or lithium-ion batteries), so they can work continuously for nearly 12 hours, so gas detectors are increasingly used as instruments of this type in various factories and health departments. wide.
Gas detectors, also known as gas alarms, can be used with a diffused gas detector that is worn on an open environment, such as an open work shop, as it can be displayed continuously, in real time, and accurately. The concentration of toxic and harmful gases on site. Some of these new instruments are also equipped with vibration alarm Accessories - to avoid audible alarms in noisy environments, and to install computer chips to record peaks, STEL (15 minutes short-term exposure level) and TWA (8-hour statistics) Weighted average) - Provides 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 combustible gases is relatively light, and most of them are distributed in the upper part of the confined space; the specific gravity of carbon monoxide and air is similar, generally distributed in the middle of the confined space; and the heavier gases such as hydrogen sulfide are present in the confined space. The lower part of the space (as shown). At the same time, the oxygen concentration is also one of the types that must be detected.
In addition, a gas 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 have a built-in pumping function - so that it can be non-contact, sub-site detection; with multi-gas detection function - to detect different spatial distribution of dangerous gases, including inorganic Gas and organic gases; with oxygen detection function - to prevent hypoxia or oxygen enrichment; portable device that is small in size 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.
Toxic gas detectors are very convenient when used for industrial hygiene testing and health surveys, with data logging and statistical calculations, as well as instruments that can be connected to computers.
At present, with the development of manufacturing technology, portable gas detectors or hybrid gas detectors or a variety of gas detectors is also a new choice for us. Since the detector can be equipped with a plurality of gas (inorganic/organic) detection sensors required on a single host, it has the characteristics of small size, light weight, correspondingly fast, and simultaneous multi-gas concentration display. More importantly, the pump-type hybrid gas detector is cheaper than multiple single-diffusion gas detectors and is more convenient to use. It should be noted that when selecting such detectors, it is best to select instruments with individual sensor functions to individually switch to prevent other sensor usage from being affected by one sensor damage. At the same time, in order to avoid the occurrence of blockage of the getter pump due to water ingress, it is safer to select an intelligent pump design with a pump stop alarm.
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