What is the accuracy of helium mass spectrometer leak detector? Comparison of leakage rate of inventory leak detection methods

There are many leak detection methods using helium mass spectrometry leak detector, the main ones are: positive pressure method, negative pressure method, helium mask method and back pressure method, positive pressure method is divided into suction gun method and accumulation method, and the corresponding equipment type and detection accuracy of each method are different. The evaporator and condenser of automobile air conditioning often use the hollow box method in the back pressure method.

According to the specific situation, the leak detection method that can meet the main requirements is more appropriate. Practice has proved that the quality and working experience of the leak detection personnel are also one of the important bases for selecting the leak detection method.

Helium mass spectrometer leak detector requirements for leak detection personnel

The requirements for leak detection personnel are as follows:

① Have a high sense of responsibility and serious work attitude;

② Have rich practical experience in leak detection;

③ Have a certain knowledge of mechanical structure, physics, chemistry, materials and welding;

Understand the structure of the inspected part and its operation process, familiar with the principle and performance of the leak detection method or instrument used;

⑤ Master the leak-detection characteristics of the leak-indicating substances used.

For example, helium gas is light, and the principle of from top to bottom and from near to far should be observed when using the injection method for leak detection (that is, from the upper part of the tested part to the lower part and from the leak detector to the far part); When using the suction method to detect leaks, the principle should be observed from bottom to top and from near to far. However, the halogen gas is heavy, in addition to observing the principle from near to far, in the injection method and suction method, the principle should be observed from the bottom up and from the top down.

If the leak detection personnel meet the above requirements, they can explain and solve the various phenomena in the leak detection work, and complete the leak detection task of identifying the leak, finding the leak hole and determining the leak rate.