INSTRUCTIONS FOR USE
The pump operation is optimized using one of the special Var-
ian controllers (Dual, MidiVac or MiniVac) only.
6. The pressure in the pump can also be determined by read-
ing the current and converting this reading to pressure with
the appropriate pressure versus current graph shown in the
appendix “Technical Information” of this manual.
CAUTION
NOTE
The safety specifications agreement using the pump is guaran-
teed using the Varian controller only.
The steps on the pressure – current charts are a characteristic
of the Dual step voltage operation. When the current drawn by
the VacIon pump reaches the specified values, the controller
will change the high voltage output to a lower applied voltage.
The VacIon
Plus
pump can be installed in any position. For
convenience, a pump is usually mounted vertically with the inlet
up. Pumps can be supported by the mounting flange in any po-
sition. For detailed information about the pump installation, see
the appendix “Technical Information”.
7. When venting the pump, use dry nitrogen. This will avoid
water vapor absorption on the pump walls.
USE
,
WARNING!
All the instructions for the correct use of the VacIon
Plus
pumps
are contained in the control unit manual. Read the manual care-
fully before using the pump. Rough pumping down to 1x10
When employing the pump for pumping toxic, flammable, or
radioactive gases, please follow the required procedures for
each gas disposal. Do not use the pump in presence of explo-
sive gases.
-4
Torr (mbar) is recommended for the most rapid starting. Rough-
ing with an oil-sealed mechanical pump is not desirable, but
when used, a trap in the roughing line is recommended to re-
duce pressure due to water vapor and oils from the mechanical
pump. Be careful to minimize the time that the mechanical
pump is open to the system and ion pump, since mechanical
pump vapors will start diffusing into the system at pressures
below 1x10
,
WARNING!
When the heating element is installed, do not touch the pump
during the heating and cooling phases. The high temperature
may cause a serious damage.
-1
Torr (mbar) and cause contamination. In systems
where oils must be completely eliminated, turbopump roughing
pumps should be used. Hygroscopic deposits and hydrogen
absorption into titanium may cause starting times to increase
with age. During exposure to air, the deposits of titanium com-
pound absorb water vapor. In subsequent start ups, pump heat-
ing causes release of the water vapor and some previously
pumped hydrogen; thus, the starting time may be lengthened.
CAUTION
Do not put any electronic device near the pump otherwise the
magnetic field around it may cause a device malfunctioning.
MAINTENANCE
Operating procedure
The VacIon
Plus
series pump does not require any mainte-
nance. Any work performed on the pump must be carried out by
authorized personnel.
Check that the controller HV polarity is correct for the pump:
positive polarity for Diode pumps and negative for StarCell
pumps. Refer to the relevant pump control unit instruction man-
ual and follow the procedure below when operating the pump:
,
WARNING!
1. With a clean roughing pump, establish a minimum starting
pressure in the vacuum system per the table on page 9 for
the type of ion pump.
Before carrying out any work on the pump, disconnect it from
the High Voltage supply.
2. Plug the control unit into a suitable power source and
switch the power ON.
If a pump is to be scrapped, it must be disposed of in accor-
dance with the specific national standards.
3. Observe the voltage, current, and roughing pressure. If
started at 5x10
-2
Torr (mbar), a controller voltage of ap-
proximately 300 to 400 volts is typical. A current value near
the short-circuit current of the control unit could indicate
that an unconfined flow discharge exists in the pump and
system. A temporary rise in roughing pressure will usually
be noticed during any starting procedure.
DISPOSAL
Meaning of the "WEEE" logo found in labels
The following symbol is applied in accordance with the EC
WEEE (Waste Electrical and Electronic Equipment) Directive.
4. Allow the roughing valve to remain open after turning on the
ion pump until an adequate starting pressure is reached. If
the ion pump voltage drops after closing the roughing
valves, reopen the valve for additional rough pumping. As
the pressure decreases, the voltage again will rise, and the
roughing valve may be closed.
This symbol (
valid only in countries of the European Com-
munity
) indicates that the product it applies to must NOT be
disposed of together with ordinary domestic or industrial waste
but must be sent to a differentiated waste collection system.
The end user is therefore invited to contact the supplier of the
device, whether the Parent Company or a retailer, to initiate the
collection and disposal process after checking the contractual
terms and conditions of sale.
5. When the voltage has increased to 2-3 kV, place the control
unit in the PROTECT condition. The system is now auto-
matically protected against pressure increases to 10
-4
Torr
(mbar) when the pump is left unattended. If such an in-
crease should occur, the control unit will be turned off
automatically.
8
87-900-106-01(B)