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By W. Umrath

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Since the quantity of air involved during a pumping process that uses condensers is not necessarily constant but alternates within more or less wide limits, the considerations to be made are more difficult. Therefore, it is necessary that the pumping speed of the gas ballast pump effective at the condenser can be regulated within certain limits. 1. Pumping of permanent gases with small amounts of water vapor. Here the size of the condenser Ð gas ballast pump combination is decided on the basis of the pumped-off permanent gas quantity.

Parameter: particle size 34 Fig. 32 Mean gas velocity vg during compression without purge gas (left) and with purge gas (right) in stages 2, 3 and 4 Vacuum generation • Losses in pumping speed and a reduction in ultimate pressure can be kept very small due to the special way in which the gas is made to pass through the pump. 2 Purge gas flow Claw pumps without internal compression for chemistry applications (“ALL·ex” ) Fig. 33 Ultimate pressure of the DRYVAC 100S as a function of pure gas flow in stages 2 Ð 4 depositing particles in the operating chamber of the pump and the resulting impairment increases with increasing pressure.

This pump has a nominal pumping speed of 250 m3/h and an ultimate pressure of < 10 mbar. At 10 mbar it still has a pumping speed of 100 m3/h. 5 kW of electric power. Vacuum generation 1000 m Saugvermˆgen Pumping speed Cooling gas Exhaust gas 3 . h-1 100 10 8 6 4 2 1 1 2 4 6 8 10 100 Ansaugdruck Intake pressure Fig. 37 Circulation of the cold gas in the ÒALLáexÓ with cooler / condenser mbar 1000 Fig. 39 Pumping speed characteristic of an ALLáex 250 Vmax Exhaust slot 1 Volume of the pump chamber starts to increase Intake slot Suction Cold gas inlet Vmin 100 (10) 1000 Pmbar (100) 100 (10) 1000 Pmbar (100) Vmax 2 Volume of the pump chamber at maximum End of suction Vmin Cold gas inlet Vmax 3 Volume of the pump chamber stars to decrease (without compression).

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Fundamentals of Vacuum Technology by W. Umrath

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