Leakage of liquefied petroleum gas (LPG) may pose a threat to life. Even at a low concentration, it can cause suffocation. When the concentration is high enough, it can cause fire or explosion.

Another is that high levels of carbon dioxide can cause respiratory problems, and long-term exposure to it can lead to death.

Therefore, it is very important to use gas sensors to monitor and warn the concentration of liquefied petroleum gas and carbon dioxide.

All sensor systems consist of two parts: a sensor element for measuring one or more electrical parameters, such as resistance, capacitance, and a circuit for measuring the changes of these parameters. Most of these sensors work with batteries, so they can work uninterruptedly for several years. Therefore, reducing their power consumption is the general trend.