The fixed gas detector is permanently installed in a specific place for long - term continuous monitoring of gas concentration. The outer shell is made of high - strength, corrosion - resistant materials to adapt to harsh industrial environments and ensure long - term stable operation. The internal sensors are carefully selected and calibrated to have high precision and stability. Its advantage lies in its ability to achieve 24 - hour uninterrupted monitoring, promptly detecting abnormal situations such as gas leaks; it can be linked with an alarm system, and immediately issue an alarm once it detects that the concentration of dangerous gases exceeds the standard; and it is easy to install and can be flexibly arranged according to on - site needs. It is widely used in places such as chemical workshops, petroleum storage tank areas, and tunnels to provide reliable protection for site safety.