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Helium is used as a tracer because it penetrates small leaks rapidly. Helium also has the properties of being non-toxic, chemically inert and present in the atmosphere only in minute quantities (5 ppm). Typically a helium leak detector will be used to measure leaks in the range of 10 −5 to 10 −12 Pa·m 3 ·s −1.
A gas detector can sound an alarm to operators in the area where the leak is occurring, giving them the opportunity to leave. This type of device is important because there are many gases that can be harmful to organic life, such as humans or animals. Gas detectors can be used to detect combustible, flammable and toxic gases, and oxygen depletion.
RGAs would also be used as sensitive in-situ leak detectors commonly using helium, isopropyl alcohol or other tracer molecules. With vacuum systems pumped down to lower than 10 − 5 {\displaystyle 10^{-5}} Torr—checking of the integrity of the vacuum seals and the quality of the vacuum—air leaks, virtual leaks and other contaminants at low ...
Sensitivity (leak rate in mbar l/s) Ultrasonics: 10 −1: Bubble test in water 10 −2: Pressure decay 10 −2: Vacuum decay 10 −2: Acoustic emission detectors: 10 −3: Bubble test in soapy water 10 −4: Gas-specific thermal conductivity detector 10 −5: Halogen detector 10 −5: Photoacoustic spectroscopy: 10 −6: Hydrogen sniffer 10 − ...
A Helium analyzer is an instrument used to identify the presence and concentration of helium in a mixture of gases. In Technical diving where breathing gas mixtures known as Trimix comprising oxygen , helium and nitrogen are used, it is necessary to know the fraction of helium in the mixture to reliably calculate decompression schedules for ...
The spacecraft and crew safely reach their destination after NASA and Boeing discovered additional helium leaks and thruster issues.
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