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6
Vacuum System
Overview
The vacuum system creates the high vacuum (low pressure) required for the
GC/MS to operate. Without the vacuum, the molecular mean free path would be
very short and ions would collide with air molecules before they could reach the
detector. Operation at high pressures also would damage analyzer components.
The Agilent 7250 Accurate-Mass GC/MS System uses four vacuum pumps to
obtain the vacuum levels needed. Three turbomolecular (turbo) pumps create
vacuum in the analyzer. These turbo pumps discharge into a manifold operating
at foreline pump inlet pressure. The foreline pump discharges to near
atmospheric pressure.
Most of the vacuum system operation is automated. Operator interaction and
monitoring is accomplished through the data system.
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7250 Accurate-Mass Q-TOF Troubleshooting and Maintenance Manual
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Table of Contents
Troubleshooting
