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Gas Required for Spectrometers

Mass spectrometers require high-purity gases, typically nitrogen or helium, delivered at specific pressures and free from contaminants to ensure accurate and reliable operation.Types of Gases
  • Nitrogen (N₂): Commonly used as a source gas, collision gas, and C-Trap bath gas in instruments like the Orbitrap Astral. Ultra-high purity (UHP, 99.999%) nitrogen is mandatory for optimal performance .
  • Helium (He): Often used as a carrier gas in gas chromatography-mass spectrometry (GC-MS) systems for sample transport and separation .
  • Other gases: Depending on the instrument, high-purity argon or hydrogen may be used for specific ionization or collision processes .
Purity Requirements
  • Ultra-high purity (UHP, 99.999%) is required for critical functions such as reagent carrier gas and collision gas .
  • High purity (HP) gases may be acceptable for less critical functions, but contaminants like particulates, oils, or moisture can damage the instrument .
  • Avoid using particulate filters in gas lines, as they can introduce contamination .
Pressure and Delivery
  • Typical nitrogen pressure for Orbitrap instruments: 600 ± 50 kPa (87 ± 7 psi), with a maximum line pressure of 650 kPa (94 psi), .
  • Gas lines must be clean, free of particulates and oils, and made of suitable materials such as copper or stainless steel for UHP gases .
  • If the laboratory gas supply serves multiple instruments, a pre-regulator should be installed to maintain stable pressure for the spectrometer .
  • Tubing length and connection fittings (e.g., 1/8” Swagelok) should be compatible with the instrument and allow easy access for installation and maintenance .
Consumption Considerations
  • Gas consumption varies depending on the type of analysis and instrument usage. Continuous operation can require significant volumes of gas .
  • Ensure the supply system can maintain the required pressure and purity even when other laboratory equipment is using the same gas source .
Summary

For reliable spectrometer operation, laboratories must provide high-purity gases at controlled pressures, with clean, compatible delivery lines. Nitrogen and helium are the most common gases, with UHP nitrogen being essential for collision and carrier functions. Proper installation, monitoring, and maintenance of gas lines are critical to prevent contamination and ensure accurate mass spectrometry results .

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