7 Gas Selection and Plumbing
GC/MS Gas Requirements
Site Preparation Guide 47
The use of hydrogen is specifically prohibited with the 7200/7250 GC/Q-TOF.
Table 23 7200/7250 Q-TOF GC/MS carrier and reagent gas flows
Carrier and reagent gas requirements Q-TOF Typical pressure range Typical flow
Helium (required for carrier and IRM) 7200 173 to 207 kPa
(25 to 30 psi)
1.0 to 2.0 (mL/min)
Nitrogen for RIS transfer line actuator 7200 6.1 to 6.8 bar
(612 to 690 kPa, or
(90 to 100 psi)
Up to 30 L/min
Nitrogen for collision cell (nitrogen source is supplied to
EPC module in GC.)
7200/7250 0.7 to 2.0 ar
(70 to 207 kPa, or
10 to 30 psi)
1 to 2 (mL/min)
Helium for collision cell (helium source is supplied to
EPC module in GC.)
7250 0.7 to 2.0 bar
(70 to 207 kPa, or
10 to 30 psi)
4 (mL/min)
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