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  • Medical Device Link .
    than 1.0 x 1013 atm-cc/sec for helium.2 The procedure is called cumulative helium leak detection, or CHLD. CHLD is a new approach to the detection of very fine leaks in sealed packages. It differs from previous methods in that it accumulates all leakage material from the package under test
  • Medical Device Link .
    connectors are available that will seal over the ends of these types of catheters (Figure 3). Alternatively, high-pressure helium can be used within the device, but this can be an expensive testing method for high-volume products unless the helium is reused or reclaimed in some way. Liquid-filled
  • Medical Device Link .
    is then evacuated, inviting the helium to pass through any leakage points in the test part into the surrounding vacuum. A mass spectrometer then samples the vacuum chamber and ionizes any helium present. Even trace amounts of the element are readily detected. Helium techniques are also particularly useful
  • Testing Medical Devices and Package Integrity
    leakage rate for bubble. testing is 10-5 Pa⋅ m3/s [2], making this the least accurate of leak testing methods. Another leak test, helium mass spectrometry, involves the detection of helium molecules. that have moved from the high concentration helium environment inside the part to the. outside
  • Medical Device Link .
    -to-metal seals with a leak rate of less than 10-8 He/cm3/sec of He at STP. It was thought that, at this low level of leakage of a small atom such as helium, the exclusion of moisture and its corrosive effects would be assured. Hermeticity has been defined in various ways; for example, as "the state
  • Medical Device Link .
    , potentially blocking actual leaks that are temporarily in contact with the plates. Tracer-Gas Methods. Recently, more-sensitive methods using tracer gases such as helium and hydrogen have proven to be effective for testing the leak integrity of medical equipment. Tracer gases are necessary because
  • Practical Vacuum: Good Design, Procedures and Maintenance Equals Good Vacuum (.pdf)
    and acetylene decomposed at fur-. air and reduce flammable gas concentra-. (hydrogen) or asphyxiant (argon, helium. nace temperatures above ~ 800˚C (1470˚F). tions due to the flammability of source and. and nitrogen) and cannot be vented to the. provide the free carbon for diffusion. With. by-product gases
  • Critical Leak Requirements in GC/MS, LC/MS and Analytical Instruments (.pdf)
    /pneutronics. tested using a helium mass. spectrometer to check for porosity. and permeability of the seat and seal. The valve type, seal, wattage, and. spring force all play a role in. determining minimum leak rates. Factors to consider that directly. affect leak rates include: • Pressure. Figure 1: GC

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