How do you test for helium leak?
In most helium leak testing applications, a mass spectrometer is used to detect helium. Although, it is also possible to use a residual gas analyser. Helium leak testing can generally be between one thousand and one million times more sensitive than using pressure decay techniques.
Why is helium used in leak detection?
Why use helium for leak detection? Helium is the best choice to find leaks because it is non-toxic, inert, non-condensable, non-flammable, present in the atmosphere in trace amounts (5 ppm). Due to its small atomic size, helium passes easily through leaks.
How can you tell if gas is helium?
Helium (from Greek: ἥλιος, romanized: helios, lit. ‘sun’) is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its boiling and melting point are the lowest among all the elements.
How does helium leak detector work?
Helium Leak Detection The spectrometer itself works in the following way: any helium molecules sucked into the spectrometer will be ionized, and these helium ions will then “fly” into the ion trap where the ion current is analysed and recorded. Based on the ionization current the leak rate is then calculated.
How is a leak test done?
The leak test is performed by immersing a part, usually a sandwich composite structure, in a hot water tank. The temperature of the water induces the expansion of air in the structure, and if a crack or a delamination is present, gas bubbles escape the structure and are immediately detected by visual inspection.
Why leak test is done?
A leak test is performed to identify weak spots as well as to improve product design. The test is performed by using high pressure to check if there is a pressure drop caused by an unintended crack or hole. Another method of leak testing is pressurizing with gas.
How much helium does an MRI use?
A typical MRI scanner uses 1,700 litres of liquid helium, which needs to be topped up periodically.
What is a helium leak tester?
Helium leak testing is a non destructive examination method which is used for detection and localization of leaks by measuring leakage in systems or objects under vacuum or pressure. In Helium leak testing a pressure difference is produced between the outer and the inner side of the object to be examined.
Why is helium used in vacuum leak detection?
Helium is used in vacuum leak detection because it is safe , has small molecules, comprises a very small part of the atmosphere, & is very distinguishable. 708-425-9080 Home
Why do you need a gas leak detection system?
Reasons For Detecting Gas. Gas Detection is often necessary or desirable for a number of reasons.
What is a helium leak detector?
Helium Leak Detection. A helium leak detector, also known as a Mass Spectrometer Leak Detector (MSLD), is used to locate and measure the size of leaks into or out of a system or containing device. The tracer gas, helium, is introduced to a test part that is connected to the leak detector.