A735-01-880 Issue C
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Introduction
1.6 Gas ballast control
To pump high vapour loads, gas ballast can be delivered into the pump to prevent condensation of the vapour carried
by the pumped gases.
Air can be introduced to the low vacuum stages through the gas ballast control (Figure 1, item 3). Alternatively, an
inert gas such as nitrogen can be supplied through a suitable external valve and by using the appropriate adaptor,
available as an accessory. Refer to Section 7.
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