Let's Get to Know More About Gas Alarms

Gas alarms are a vital safety device designed to detect and alarm gas leaks to protect the safety of homes and industrial environments. Its working principle mainly relies on gas sensor technology, which can monitor the concentration of combustible gases in the environment in real time and issue an alarm when the concentration exceeds a set threshold. The following is the detailed working principle and related information of the gas alarm:

1. Gas sensor

The core component of the gas alarm is the gas sensor, which can sense the concentration of combustible gases in the environment. Common gas sensor types include:

Oxide semiconductor type sensor: Uses the resistance change of semiconductor materials to detect gas concentration. When a combustible gas (such as methane) adsorbs on the sensor surface, it causes a change in the resistance of the semiconductor material, thereby detecting the presence of the gas.

Catalytic Combustion Sensor: Detects gas concentration by catalyzing the flameless combustion of combustible gas on the surface of platinum wire. After combustible gas enters the sensor, an oxidation reaction will occur on the surface of the platinum wire, generating heat to increase the temperature of the platinum wire, causing the resistance of the platinum wire to change. This kind of sensor has high detection sensitivity for combustible gases and is suitable for industrial environments.

Electrochemical Sensor: Detects gas concentration based on the redox reaction between combustible gas and oxygen. When combustible gas enters the sensor, it reacts with oxygen and generates a current signal. This kind of sensor has a better detection effect on toxic gases such as carbon monoxide and is suitable for domestic and industrial environments.

2. Signal processing and alarm

When the gas sensor detects that the combustible gas concentration exceeds the set threshold, it transmits a signal to the controller or control circuit. The controller processes and analyzes the signal, and once it is confirmed that the gas concentration exceeds the standard, the alarm device will be triggered. Alarm devices usually include an audible siren and a flashing light to draw attention. For example, when the natural gas concentration exceeds the alarm threshold, the alarm will sound a high-frequency alarm sound and flash lights to remind users to pay attention to gas leaks.

3. Linkage control

Some advanced gas alarms have linkage control functions and can be linked with other safety equipment (such as electromagnetic shut-off valves, exhaust fans, etc.). When the alarm detects a gas leak, it will not only sound an audible and visual alarm, but also automatically close the gas valve to prevent continued gas leakage, or start an exhaust fan to discharge the leaked gas outdoors, thereby further improving safety.

4. Installation and maintenance

Proper installation and regular maintenance of gas alarms is crucial. The appropriate location should be selected during installation, usually near the gas equipment, such as the air inlet of the gas pipeline, near the burner and other places where leakage is prone to occur. At the same time, regular inspection and cleaning should be carried out to prevent the detector from being eroded and contaminated by dust and affecting its normal operation. In addition, the battery should be replaced or charged in time to ensure sufficient power to ensure continuous transmission of alarm signals.

5. Application scenarios

Gas alarms are widely used in domestic, industrial and commercial environments to ensure the safety of gas use. In homes, gas alarms can be installed in kitchens, bathrooms and other places where gas leaks may occur. Once a leak occurs, the alarm can be reported in time to avoid accidents. In industrial and commercial environments, gas alarms are usually linked with other safety equipment (such as fire alarm systems, ventilation systems, etc.) to form a complete safety protection system.

Summarize

The gas alarm detects the concentration of combustible gas through a gas sensor. When the concentration exceeds the set threshold, it triggers an alarm signal and can be linked with other safety equipment to ensure the safety of homes and industrial environments. Proper installation and regular maintenance are key to ensuring gas alarm performance. Through effective monitoring and timely alarm, gas alarms play an important role in preventing gas leak accidents.