Pfeiffer Vacuum A Passion for Perfection

2.8.3.4 Accessories

(Figure 2.26)zoom figure
Figure 2.26: Accessories for turbopumps

In addition to the electrical operating devices described above, various accessories are also available for special applications. Some DCU power supplies enable a TPR 280 vacuum gauge to be connected in order to measure pressures in a vacuum system.

With the aid of the „backing pump” relay box (6) the DCU power supply (2a) can be converted to a pumping station controller that can switch on both turbopump (1a) and backing pump simultaneously.

Either a fan (4), or water cooling (3) for high gas loads, can be attached to cool the pumps.

An electric vent valve (8) vents the turbopumps if the RPM declines below a given speed. In the event of a brief power failure, the vent valve will remain closed to maintain the vacuum. The pumping station will then re-start immediately when mains voltage is restored. However this necessitates a backing pump with a safety valve that will close automatically in the event of a power failure.

For UHV applications, a heater (9) can be connected to the pump that switches on automatically after a preselected RPM is attained, and switches off when RPM decreases.

Electromagnetic sealing gas valves (7b) with matching throughputs, as well as sealing gas throttles (7a) for pumps of various sizes, are available for corrosive gas pumps.

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