130 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 7000 Series Triple Quad GC/MS uses two vacuum pumps to obtain the
vacuum levels needed. The foreline pump creates a low vacuum, then a high
vacuum pump engages to create the vacuum needed for operation. The 7000
Series Triple Quad GC/MS uses one turbomolecular (turbo) pump.
Most of the vacuum system operation is automated. Operator interaction and
monitoring is accomplished through the data system.
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