96 Troubleshooting and Maintenance Manual
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 7200 Accurate-Mass GC/MS System uses four vacuum pumps to
obtain the vacuum levels needed. The Agilent 7200 Accurate-Mass GC/MS
System uses three turbomolecular (turbo) pumps to 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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