When the combustible gas concentration, temperature, humidity, and infrared intensity exceed the preset alarm value, the corresponding sound alarm sounds directly through the buzzer until it stops after returning to normal; if the combustible gas concentration, temperature, humidity, and infrared intensity do not reach the alarm Value, then continue to check whether the warning value is reached. If the combustible gas concentration, temperature, humidity, and infrared intensity are always above the warning value and below the warning value during the detection time, a corresponding frequency warning sound will be issued, and the warning can be detected on the host computer. The reason; if the combustible gas concentration value exceeds the alarm value during the warning detection time, it will directly alarm; if the environment returns to normal within the specified time, the timer will be cleared without warning; if the combustible gas concentration, temperature and humidity, infrared intensity If the alarm value and pre-warning value are not reached, the test will continue.