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Introduction
A730-01-880 Issue E
Figure 1 - XDS35i scroll pump
1.3 Description
The XDS35i pump is shown in Figure 1. Refer to Figure 1 for item numbers in brackets in the following descriptions.
The XDS pump is a compact, reliable vacuum pump which is suitable for use on vapour handling processes. The XDS
pump may be used for some pumping applications involving corrosive substances and particulates; for information on
pumping flammable gases, please refer to Section 4.5 and contact Edwards for any further assistance.
The body of the pump includes a fixed scroll and an orbiting scroll. The orbiting scroll is controlled by the electric
motor through an eccentric cam on the motor drive shaft. The movement of the orbiting scroll, meshed with the
fixed scroll, forms successive crescent shaped volumes in the pump. Gas that enters the pump through the inlet is
compressed by the movement of the orbiting scroll and swept towards the centre of the fixed scroll. The compressed
gas enters the exhaust port near the centre of the stationary scroll and is exhausted from the pump through the
outlet.
The XDS is a truly dry vacuum pump, as all the bearings, with their hydrocarbon lubricant, are isolated from the
vacuum space.
The inlet of the pump has a NW40 (1) inlet and inlet strainer.
1. NW40 inlet port
2. Gas ballast control
3. Cooling fan
4. NW25 exhaust port
5. Fan connector
6. Rubber feet
7. Electrical connector
8. Voltage changeover switch cover
9. On/Off switch
10.15 way connector
11.Hour counter
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