Operating in Electron Impact (EI) Mode 3
Controlling Collision Cell Flow
Operation Manual 49
The MS can be used to measure actual column flow. You inject a
small amount of air or other unretained chemical and time how
long it takes to reach the MS. With this time measurement, you
can calculate the column flow. See “To Calibrate the Column” on
page 58.
Controlling Collision Cell Flow
The collision cell gas flow rate is controlled by an EPC module
located in the GC. The collision cell gas flow consists of
nitrogen. The gas pressure at the EPC outlet controls the flow of
the gas. This pressure is controlled by the MassHunter Data
Acquisition Workstation or directly at the GC keypad. See “To
Set the Collision Cell Gas Flow Rate” on page 61.
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