Helium Leak Detectors are used for locating and measuring internal or external leaks of a containing device or system. The test part, to which helium is first introduced, is interconnected with a leak detector. The partial pressure of the helium gas which leaks from the test part and enters the system is measured. The results are then displayed on the meter. Find out more information on helium leak detectors by visiting FlexPak.
Methods involved in leak detection
The method of detecting a leak in the system should be determined only after examining the functional conditions of the parts that are to be tested. Moreover, while testing, it is equally important to maintain a level of pressure that is equivalent to the pressure in the system when it functions normally. For instance, a vacuum system is ideally tested after creating a vacuum within the chamber. Similarly, testing a compressed gas cylinder for leaks yields the best results when there is high pressure within the cylinder. To conclude from the above mentioned examples, there are therefore, two methods for detecting leaks: Pressure-testing, commonly described as the 'Inside-out' method, and Vacuum-testing, known as the 'Outside-in' method.
Vacuum-testing: In this method, the part to be tested is first separated and evacuated by using a pumping system. To locate the leak, helium gas is administered to suspected leakage sites by using an adjustable spray probe flow system.
Pressure-testing: In this method, the affected part of the container is pressurized either with pure helium, or a diluted mixture of air and helium. Leaks are located by scanning the potential sites of damage with the assistance of the Sniffer Probe that is connected with the inlet pipe of the detector.