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2. With the main power switch in the OFF posi-
tion, plug the control unit into a suitable power
source.
3. Turn the power to ON.
4. Observe the reading for an indication of one of
the following conditions:
− If the pump is free of leaks and is at a low
pressure, the pressure indication shall
quickly fall to or below the 10
range as the volume of gas is pumped.
− If the pressure inside the pump is at or near
atmospheric level, an arc may strike inside
the high voltage feedthrough giving a popping
sound and the pump current will fluctuate. If
this occurs, turn the power OFF immediately.
5. If the vacuum integrity has been lost, the pump
should be leak-checked with a mass spec-
trometer leak detector before installation on the
system.
Short circuits
If there is a short circuit between the anode and
cathodes in the pump, the short-circuit current of
the control unit will be drawn and zero voltage will
be indicated. If a short circuit exists in the control
unit or high voltage cable and connector, zero
voltage will also be observed when the high volt-
age connector is disconnected from the pump (re-
fer to the control unit manuals).
TYPICAL INSTALLATION
A typical installation is shown in the following fig-
ure and consists of:
1. VacIon Plus pump.
-8
Torr (mbar)
2. A Valve to seal off the pump from the rest of
3. The control unit.
4. A clean roughing pump (i.e. turbo or sorption).
5. A thermocouple gauge capable of indicating
6. A valve to seal off the roughing pump from the
7. High voltage cable.
8. Backing pump.
Fig. 21 - Typical installation
16
TECHNICAL INFORMATION
the system (if required).
pressure from atmosphere to 10
range.
vacuum chamber. Roughing lines, are usually
made of stainless steel or copper tubing, or
other low vapour pressure material.
-3
Torr/mbar
87-900-063-01(C)
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