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Fixed gas detectors and portable gas detectors are both monitoring devices developed to facilitate gas detection in different usage environments; fixed gas detectors can provide 24/7 real-time monitoring of specific locations. The control alarm host can be installed separately in the duty room or monitoring room. Real-time monitoring of all potential leakage points is carried out to dispatch assistance or promptly notify on-site personnel in case of direct exposure to toxic and harmful gases. For example: chemical plants, sewage treatment plants, pharmaceutical processing workshops, coking coal smelting industries, and so on. Control the leakage points of various harmful gases to prevent the occurrence of potential hazards. Portable gas detectors are compact in design, making them easy to carry and use for occasional inspections. They can be used to check the gas safety in locations that are not fixed, or where potential hazards exist, such as municipal underground pipelines, gas transport vehicles, and coal mine operations in various inspection sites. At the same time, the device can be equipped with sensors for detecting single gases as well as multiple gases, providing effective early warning and monitoring to protect the personal safety of workers and operators. Advantages of portable gas detectors: they are easy to carry, allowing for testing in various environments at any time; they have a built-in sampling pump, enabling fast detection; they are user-friendly, and can provide real-time protection against gas hazards in construction sites. Disadvantages: It cannot perform continuous monitoring; human intervention is required in the environment being tested, and the product also needs to be calibrated periodically. Advantages of fixed gas detectors: Continuous monitoring at specific gas detection points. Suitable for real-time monitoring in industrial facilities and large chemical enterprises, to prevent direct exposure of personnel to toxic and harmful gases. Disadvantages: It requires a separate power supply, and there are specific requirements regarding the environment, wiring, signal interference, and usage. The advantages and disadvantages between the two depend more on factors such as the usage environment, location, type of operation, and monitoring range. Therefore, choosing a suitable and safe gas detector is what is needed for both personal protection and corporate protection.