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Technical Information
Obtaining High Vacuum on the NHS-35
When operating at low pressures (below 1x10
lowered by bypassing the por- tion of the cooling coils located at the bend of the
foreline as shown in Figure 10. This procedure raises the temperature of the
foreline and provides additional degassing of the fluid returning to the boiler, thus
making lower pressures possible.
This configuration decreases the maximum throughput capacity of the pump.
NOTE
Use this cooling configuration only if the pump is not meant to operate near the
high pressure end of its operating range.
Electrical Connections
Terminal connections for each pump are different depending on the source
voltage available, the principle difference being a Y or
heaters. The following Table provides the figure number and page of the wiring
diagrams in this manual. The specific wiring diagrams for each pump shows
both Y and
WARNING
Improper operation, severe heater damage, and danger to personnel can
result from an improperly wired diffusion pump system.
WARNING
High voltages (up to 480 V) can kill.
Always break the primary circuit to the pump before starting work on the
heater or its wiring.
High Throughput Diffusion Pumps User Manual
∆
connections and the source voltages for each connection.
Torr), the ultimate pressure can be
-6
∆
connection of the
39
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