What is a portable gas detector?

Nowadays, portable gas detectors on the market generally have sound, alarm light and vibration alarm. It should be noted that not only the detected distance and decibel value (for example, at 750 px >；; 95Db), and at the same time pay attention to the sound penetration. There is also a fall alarm function. If the operator falls and loses consciousness for more than 20 seconds, the instrument will automatically give an alarm. If it lasts for 10 second, it will become a high alarm. There is also an instant alarm function. If the operator realizes that there is an emergency at the scene, he can manually touch the button through the instrument and give an alarm to the people around him. These two items are exclusive patents of American-funded Mei Xian Company.