Standalone combustible gas detectors come with a measuring range of 0-100% LEL, built-in MCU for processing, and complete the functions of the detector through programs solidified in the MCU. The modular design makes it more stable, safe and reliable. When the detector detects that the combustible gas has leaked to the alarm setting value, it will send out an audible and visual alarm to remind the user to take timely measures, and the solenoid valve can be linked to close the combustible gas to ensure the user's declared property safety.