Turn off the main gas valve at home, open windows for ventilation, and listen to the household gas leak alarm to see if the ventilation continues for a long enough time. If it doesn't scream, it means there is indeed a gas leak. If it still beeps, it means that the household gas leak alarm is broken and needs to be replaced with a new one. Household gas leak alarms are very sensitive and cannot be used to determine whether there is a small gas leak by smelling the smell of gas.
Extended information:
Gas leak alarm is a very important gas safety device. It is the last protection for the safe use of city gas. The alarm detects low-concentration combustible gases in the surrounding environment through a gas sensor. Through the sampling circuit, the detection signal is transmitted to the controller or control circuit in analog or digital quantities. When the combustible gas concentration exceeds the setting value in the controller or control circuit, When the value is reached, the controller sends an alarm signal or performs actions such as closing the gas valve through the actuator or execution circuit.
The sensors used to detect combustible gases in combustible gas alarms mainly include oxide semiconductor type, catalytic combustion type, hot wire gas sensor, and a small number of other types, such as chemical battery sensors. These sensors produce chemical or electrochemical reactions on the sensor surface through adsorption of combustible gases in the surrounding environment, causing changes in the electrophysical properties of the sensor.
Gas leak alarms are widely used in urban security, communities, factories, companies, schools, families, villas, warehouses, resources, petroleum, chemicals, gas transmission and distribution and many other fields.
Functional features of the gas leak alarm:
1. Can sense gas, natural gas, and liquefied petroleum gas;
2. Patented sensor that is normal temperature and does not Produces passivation phenomenon, low power consumption, long life;
3. Intelligent control of single chip microcomputer, prevents false alarms and missed alarms;
4. Power light: green light, lights up after power on On, it goes out when the alarm occurs; alarm light: red light, lights up when the alarm occurs, and goes out when the alarm stops;
5. Turn on the power, and after the green light lights up or flashes for 3 minutes, the alarm starts to work normally;
6. When the detected gas reaches the alarm point, the alarm starts to alarm, the green light goes out, the alarm light comes on, and the buzzer emits an alarm sound of "B, B, B...". When the concentration drops below the alarm point, the alarm will stop alarming. (The carbon monoxide alarm has a delay function);
7. If the manual detection function is added, when the button is pressed, the green light goes out, the alarm light lights up, and the buzzer emits "B, B, B..." alarm sound;
8. If the exhaust fan function is added, when the alarm alarms, the connected exhaust fan will start to automatically eliminate harmful gases;
9 . If the function of connecting a manipulator or a solenoid valve is added, when the alarm alarm occurs, the connected manipulator or solenoid valve will automatically close the gas valve, thereby cutting off the source of harmful gases;
10. If the function of networking is added When the alarm alarm occurs, the management center or control center receives the normally open and normally closed (NO, NC) signals at the same time.
(For those with added wireless function, the alarm host will receive a wireless signal for 2-3 seconds)
Baidu Encyclopedia - Gas Leak Alarm