7 Gas Selection and Plumbing
Performance verification
48 Site Preparation Guide
GC/MS systems with a JetClean ion source system installed use helium as the GC carrier gas
and an additional supply of hydrogen gas to the MS analyzer. Table 24 shows typical supply
pressures needed for operation. These values reflect the pressures supplied to the
instruments, not setpoints.
Performance verification
Performance verification requires the following:
• Helium carrier gas.
• For MS systems using chemical ionization or methane reagent gas.
Table 24 JetClean ion source system gas supply pressures
Gas supply Pressure delivered at the GC
Helium 690 kPa (100 psi)
Hydrogen
≤ 621 kPa (90 psi)
*
* Any delivery pressure ≤ 621 kPa (90 psi) is acceptable as long as it is 69 kPa (10 psi) higher
than the maximum hydrogen pressure needed during operation.
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