How Does a Vacuum Leak Detector Work?

The vacuum leak detector is an instrument used to detect the presence of gas leaks in closed systems. By creating a vacuum environment and injecting easy-to-detect gases, combined with sensors and analysis systems, it can detect and alarm gas leaks in closed systems. Its working principle mainly includes the following steps:

The first step is to establish a vacuum environment. The vacuum leak detector uses a pump device to extract the gas from the system being detected to create a vacuum environment that is lower than the outside atmospheric pressure. This step aims to enhance the significance of gas leaks and provide favorable conditions for subsequent detection.

The second step is to inject tracer gas. In the created vacuum environment, an easy-to-detect gas is injected into the system being tested, usually helium or hydrogen. These gases can penetrate potential leaks more efficiently due to their smaller molecular size and strong diffusion ability.

The third step is to implement the measurement. Vacuum leak detectors use built-in sensors or detectors to continuously monitor gas concentration changes inside the detection system. When a gas leak occurs, the leaked tracer gas will cause the gas concentration inside the system to gradually increase. By accurately measuring concentration changes, it is possible to accurately determine whether there is a gas leak.

The fourth step is data analysis and alarm. The vacuum leak detector transmits the gas concentration data captured by the sensor to the control system for detailed data analysis. Once an abnormal gas concentration is detected, it indicates the existence of a gas leak. At this time, the leak detector will immediately trigger audible and visual alarms and other signals to alert the operator to take necessary repair measures in a timely manner.