They are generally a concept. The biggest difference is that the gas alarm must have an alarm function, while the gas detector does not necessarily have an alarm function. There is no difference in other functions. They all use gas sensors to detect changes in gas concentration. There are two types of portable and fixed. Portable is generally powered by batteries, and there are two types of diffusion and pump suction. The fixed type is powered by power supply and can be monitored in real time for 24 hours.
There are generally three different types of fixed gas detectors. The simplest one has only an alarm function. Although it is also detected by a gas sensor, the instrument has no display screen. When the instrument detects an abnormal gas concentration, the instrument directly sends an alarm signal, but it is impossible to know the specifics. concentration value. The second is that there is only a display function and no alarm function, and it is mostly used to observe the concentration change of gas. The third is that it has alarm function and display function. This instrument is the most widely used and has the most complete functions. It can not only display the change of gas concentration but also send out an alarm signal when the gas concentration is abnormal.
Portable gas detectors are divided into diffusion type and pump suction type according to different detection methods, both of which have alarm function and display function. Diffusion gas detectors place the instrument directly in the environment when detecting, and the measured gas contacts the gas sensor with the air flow, which is suitable for the situation where the detector can directly contact the measured gas; pump-suction gas detectors are usually equipped with small suction Pump and sampler, the instrument sucks the measured gas into the instrument through the sampler and suction pump for sensor detection, which is suitable for the situation where the measured gas is difficult to directly contact with the detector.
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