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  • Wired 8.08: A Helium Shortage?
    - and therefore helium-3 - before the fusion technology is even developed. Nearly all of the world's helium supply is found within a 250-mile radius of Amarillo, Texas (the Helium Capital of the World). A byproduct of billions of years of decay, helium is distilled from natural gas that has accumulated
  • How to Convert from Helium to Hydrogen as a Carrier Gas in Gas Chromatography (.pdf)
    conditions. 1. Leak check the system; leaks may affect the determination of the actual flows. you are using for your analysis. 2. Measure and record the existing dead volume time and calculate the Linear. Gas Rate (LGR). 3. Measure and record the Septum flow at the initial run temperature. 4. Measure
  • Leak Testing Meets - New Semiconductor Industry Needs
    Helium leak detectors have evolved quite dramatically in recent years. Thanks to the electronics revolution, expanded features and interface capabilities have become more user friendly and more suitable for advanced applications, such as those found in the semiconductor industry. Manufacturing
  • Leak Testing Meets - New Semiconductor Industry Needs
    Helium leak detectors have evolved quite dramatically in recent years. Thanks to the electronics revolution, expanded features and interface capabilities have become more user friendly and more suitable for advanced applications, such as those found in the semiconductor industry. Manufacturing
  • Critical Leak Requirements in GC/MS, LC/MS and Analytical Instruments (.pdf)
    for chromatography consists of an injection port at one end of a metal column packed with substrate material and a detector at the other end. A carrier gas propels the sample down the column while flow meters and pressure gauges in the instrument maintain a constant flow. Critical Leak. Parker Hannifin
  • Selecting Makeup Gas for GC with FID (.pdf)
    such as helium. larger than. gas flow rate is in the order of a few mL/min. or nitrogen is delivered to the chromatographic. In contrast, the optimum flow rate for detec-. system between the column and the detector. The. the flow rate. tion of the compounds of interest is typically. makeup gas should
  • Medical Device Link .
    with molecular weights close to helium.3 This can affect the accuracy of helium detection and limits the minimum detectable leak to approximately 1.0 x 10 -9 atm-cc/sec or greater. The performance of most traditional helium leak detectors when measuring leaks in semiconductor or electronic packages can
  • Medical Device Link .
    the location of thin channel leaks. It features retrievable validation data and a graphic display. 143 California St., Newton, MA 02458. Featuring an oil-free diaphragm and molecular drag pump, a portable helium leak detector works in cleanrooms, pharmaceutical manufacturing facilities, and other
  • Medical Device Link .
    that would block the larger molecules of most other air-component gases (e.g., oxygen and nitrogen). In situations where helium-based leak testing can detect pores small enough to block the passage of microbes, this technique can be used to help audit packaging processes or to production test package
  • Medical Device Link .
    the leak test can be started. Up to four intelligent detector modules can be connected to the control unit for remote programming with up to 10 programs each. Each of the gas boxes functions independently of the others irrespective of their power or operational status. Program editing or removal can

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