1, consistency
For some leak detection methods, the detection results are basically the same regardless of whether the inspectors are skilled or not; Some methods are used by both experts and laymen, and the results are completely different. If possible, methods that can be correctly detected without skilled special technology should be adopted. Each method has different technical keys, and different leak detectors may not get consistent leak detection results.
2. Stability
Air tightness detection is a comprehensive measurement and testing technology. If the test data is unstable, it is meaningless. Correct air tightness detection requires not only the stability of the detection instrument, but also the good stability of the detection method itself.
3. Reliability
Failure to detect leakage does not mean that there is no leakage, which should be judged. When using a certain method for leak detection, we should know whether the method is reliable or not. The reliability of leak detection results is related to the consistency and stability of the above methods.
4. Leak detection principle
No matter which air tightness detection method is adopted, it is necessary to understand its basic principle. The air tightness detection method covers a wide range of contents and embodies various measurement and detection technologies. It is not easy to know the principles of many detection methods in detail. This book will briefly introduce the basic principles of common leak detection methods.
5. Response time
No matter what method is adopted, it always takes some time to detect the leakage rate. Response time may affect the accuracy and sensitivity of leak detection. Generally speaking, extending the detection time will improve the sensitivity, but if the detection time is too long, the detection accuracy may be reduced due to the change of environmental conditions. The response time includes the response time of the air tightness testing instrument itself, the lag time of gas flow and the time required for various preparatory work. This must be taken into account when choosing the leak detection method.
6, the judgment of the leakage point
Some air tightness detection methods can only judge whether there is leakage in the system, but can't determine where the leakage point is. Some leak detection methods can not only determine the leakage point, but also determine the leakage rate. If only to find out whether the equipment is qualified, the former method can be used. The latter method must be adopted when carrying out maintenance or finding the cause of leakage, and sometimes there will be missed inspection when using the latter method.