The main methods for detecting leaks in vacuum systems include the following:
Pressure leak detection method: This method is to fill a certain pressure of gas (such as air or water) into the vacuum system, and then check whether the gas leaks out from the leak point. Specific operations include water filling leak detection and pressure testing. Water filling leak detection needs to be performed when the system is shut down and cold. The disadvantage is that it can only detect leaks that exist under expansion pressure. The pressure testing method is to fill positive pressure gas and apply soapy water to check the leak point. The disadvantage is that it is time-consuming and labor-intensive and is greatly affected by the environment.
Vacuum leak detection method: This method is to evacuate the system to be tested into a vacuum state, and then detect the leak point by applying a leak-indicating substance externally. The advantage is that the detection can be performed while the system is running, and the disadvantage is that the sensitivity is affected by environmental factors.
Helium mass spectrometry leak detection method: Use helium as a tracer gas to detect leaked helium through a mass spectrometer. This method has high sensitivity and can detect extremely small leak rates, but the equipment is expensive and the operation is complicated.
Halogen leak detection method: Use halogen compounds as tracer gases to determine leaks through the principle of ionization detection. The advantage is low cost, but the sensitivity is slightly inferior to helium mass spectrometry leak detection.
Ultrasonic leak detection method: Identify leaks by detecting ultrasonic waves generated by leaks, but are easily disturbed by other noises.
Definition and importance of vacuum system: A vacuum system refers to a system that achieves a highly pure and stable vacuum state in a closed space. The effective operation of a vacuum system depends on its sealing, and any leak will affect the performance of the system and product quality. Therefore, vacuum leak detection is essential to maintaining system performance, improving product quality, and ensuring safety.
