7 Gas Selection and Plumbing
Gas Supplies
Site Preparation Guide 43
Gas Supplies
General requirements
Supply instrument gases using tanks, an internal distribution system, or gas generators. If
used, tanks require two-stage pressure regulators with packless, stainless steel diaphragms.
The instrument requires 1/8-inch Swagelok connections to its gas supply fittings.
See Figure 6.
Plumb the gas supply tubing/regulators so that one 1/8-inch Swagelok female connector is
available for each gas needed at the instrument.
Figure 6. Example Swagelok connector and hardware
Table 15 Carrier, collision and reagent gas purity
Carrier, collision and reagent gas
requirements
Purity
Notes
Helium (carrier) 99.9995% Hydrocarbon free
Hydrogen (carrier) (carrier and
self-cleaning ion source)
99.9995% SFC grade
Nitrogen (carrier) 99.9995%
Nitrogen (drying gas, nebulizer
pressure)
*
* Purity specification is the minimum acceptable purity. Major contaminants can be water,
oxygen, or air. Drying gas and nebulizer pressure gas can be supplied by a nitrogen gas
generator, house nitrogen system, or liquid nitrogen dewar.
99.999% Research grade
Methanol
†
† Required reagent for performance verification in internal CI mode only. Evaporation residue
<.0001%.
99.9% Reagent grade. Purge and
trap grade
recommended.
Swagelok nut and ferrules
Female Swagelok fittings on GC
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