Pfeiffer Vacuum

4.5.3.1 Air cooled multi-stage Roots pumps

The versions shown in Table 4.14 can be supplied with either a three-phase or a single-phase mains power connection. Irrespective of the mains voltage and frequency, all pumps are equipped with a frequency converter.

Air cooled multi-stage Roots pump configurations
Model Standard version ”G“ version for corrosive gases ”CV“ version for condensable media
Without gas ballast Manual gas ballast valve Permanent gas ballast with inlet filter Manual gas ballast valve Permanent gas ballast with inlet filter
ACP 15
ACP 28
ACP 40

Table 4.14: Possible configurations of air cooled multi-stage Roots pumps

Air cooled multi-stage Roots pumps
Model Pumping speed Ultimate pressure with/without* gas ballast Applications
ACP 15 14 m³ · h-1 3 · 10-2 hPa Noncorrosive gases, argon, backing pumps for turbopumps
ACP 28 27 m³ · h-1 3 · 10-2 hPa
ACP 40 37 m³ · h-1 3 · 10-2 hPa
ACP 15 14 m³ · h-1 1 · 10-1 hPa* Standard applications with a humidity > 5% or desorption from chamber walls, regeneration of cryo pumps
ACP 28 27 m³ · h-1 1 · 10-1 hPa*
ACP 40 37 m³ · h-1 1 · 10-1 hPa*
ACP 15G 14 m³ · h-1 1 · 10-1 hPa* Load locks and transfer chambers, backing pumps for turbopumps with high incidence of light gases, process gases with low corrosive gas concentration, particle-laden process gases, oxygen and oxidating media
ACP 28G 27 m³ · h-1 1 · 10-1 hPa*
ACP 40G 37 m³ · h-1 1 · 10-1 hPa*
ACP 28CV 27 m³ · h-1 2 · 10-1 hPa* Drying, distillation, applications with vaporizing fluids
ACP 40CV 37 m³ · h-1 2 · 10-1 hPa*

Table 4.15: Air cooled multi-stage Roots pump performance data

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