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When testing using helium, it is possible to flood the mass spectrometer with helium if there is a large leak. One just evacuates both inside and outside, then backfills to 150mbar absolute pressure. This is useful if you are trying to test a 60 litre automotive fuel tank that can only withstand 150mbar pressure. It is possible to have high vacuum connected to the Mass Spectrometer and a partial vacuum in the part. This may mean putting the part under test inside a leak tight chamber. You need to arrange these pressures either side of the leaking boundary. Can the part or assembly withstand this pressure? It is possible to test a part at high pressure and high vacuum at the same time. The high vacuum technique requires that the test volume to which the instrument is connected is at high vacuum, such as less than 3mbar absolute pressure. It is worth remembering that leakage is a flow of fluid from a higher pressure to a lower pressure through a fault in an assembly or manufactured part. On a safety note, please remember that bottled helium contains no oxygen and is therefore an asphyxiant.
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On rare occasions, a certifiably pure gas can be used. Most tests use readily available Balloon Gas. or 1cc is approximately 1mbar litre per second. For reference 1 cubic millimetre per second is approximately 1×10 -3mbar.l.sec -1. There are 2 basic techniques high vacuum testing which allows leak test thresholds to be set down as low as 1×10 -12mbar.l.sec -1, or sniffing which is generally used for helium leaks down to 1×10 -6mbar.l.sec -1. This should result in a longer product life. Using this technique you can leak test to find smaller leaks than with other test processes, using a largely temperature independant, dry technique. What are the benefits of Helium Leak Testing? Helium leak testing can generally be between one thousand and one million times more sensitive than using pressure decay techniques. Although, it is also possible to use a residual gas analyser. In most helium leak testing applications, a mass spectrometer is used to detect helium. Being inert, helium is relatively safe to use (rather than hydrogen) and will not react with any of the materials within the part to be tested. Helium is one of the smallest gas molecules and is inert. This guide to helium leak testing should outline the basics of using this leak testing method. The helium is used as a tracer gas and its concentration is measured. Helium leak testing is used to find small leaks or larger leaks in bigger volumes.
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Helium test time calc crack#
Valve Reseat – Measure the amount of pressure at a check valve closure ( used in conjunction with the Crack test that will find the opening pressure)Ĭreep ( Ramping Fill) – Ramping fill pressure decay test that can be set for multiple stages.Guide to the Fundamentals of Helium Leak Testing What is helium leak testing? Pressure Increase – Pressurize one side of a multichambered part and inspect for an increase on the adjacent side Using one or more specialty tests, in concert with standard leak tests, can provide the highest level of quality assurance for the development and manufacturing of any product.īackpressure Flow – While holding the flow rate constant, measure the back pressure created by the part At Zaxis, we offer several high precision specialty tests to ensure product viability. In some cases, the standard leak tests are not enough.
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Imagine the air creates a hiss that is detected by its frequency. Ultrasonic – This method relies on higher-pressure air creating a sound that is picked up with a high sensitivity microphone.Smaller gas molecules are used to find smaller leaks. Tracer Gas – This is another name for helium testing where other gases, such as hydrogen, are used.Any air leaking into the part is picked up by the helium sniffer inside the tester. Helium Spray – Vacuum is pulled on the part through a tester equipped with a helium sniffer.Helium Sniff – Similar to Helium Accumulation but the operator uses a wand to sniff the part and find where the helium is leaking out of the part.This method puts the part under helium pressure and then captures the escaping helium in an umbrella shaped cone as it rises. Helium Accumulation – Helium is light, so it rises.Helium is used because of the molecule size helium gets out of smaller holes than air or nitrogen can. A sensor in the chamber then detects any helium leaving the part and entering the chamber. Hard Vacuum (Helium) – A part is charged with helium and then placed in a chamber.Bubble/Submersion – This test simply putts pressure on the part, then dunks the part under water and looks for bubbles.