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INLET FLANGE CONNECTION
The VacIon pump can be installed with any orien-
tation, but should be mounted to fulfill two re-
quirements.
First, a minimum of clearance is necessary for the
removal of the high voltage connector.
Second, the effect of the pump's fringing magnetic
field should be considered (see para. "STRAY
MAGNETIC FIELD").
To avoid accumulation of dust and other particles
or foreign material, the pump should be kept
sealed with its pinch-off tubulation until it is ready
for attachment to the vacuum system.
Do not open the pinch off-seal with a saw or
grinder. These methods will cause metal particles
to be drawn into the pump by the inrushing air as
the pump is opened.
When ready to install the pump, release the inter-
nal vacuum by using pliers to open the copper
tube pinch-off.
WARNING!
The pinch-off seal is extremely sharp. Be careful
when opening. Watch your fingers.
Unscrew the main flange bolts. Remove the ConFlat
flange and the copper gasket plate. Some particles
of copper oxide may adhere to the outer edge of the
flange gasket. Be careful not to allow them or any
other foreign materials to fall into the pump.
Connect the pump to the vacuum chamber with a
short length and large diameter tubulation in order
to retain as much as possible the pumping speed
of the pump. Proceed as follows:
1. Inspect the mating flanges for cleanliness and
absence of scratches on the knife edge.
2. Place a new copper gasket between pump
flange and vacuum chamber flange.
3. Bolt mating flanges of the pump to the chamber
with the screws provided with the ion pump. For
flanges over NW 35 (2.75" o.d.) also mount
washers below the nuts and screw heads.
4. Use silver-plated screws or apply high tem-
perature lubricant to the screw threads. Lubri-
cation simplifies sealing and disassembly. A
recommended lubricant is Fel-Pro C-100.
NOTE
Lubrication is essential to prevent galling of the nut
and screw after bakeout.
5. Attach the nuts and tighten each one to 4.5 - 8
ft.-lbs (0.6 - 1.1 Kgm) of torque. After tightening
a nut, always tighten the opposite nut with re-
CAUTION
spect to the center of the flange. This will par-
tially close the gap between the flange faces.
6. Repeat the sequential tightening for two more
cycles.
7. Continue tightening the bolts until the flange
faces meet and a pronounced increase in
torque is felt.
CONTROL UNIT CONNECTION
The high voltage present in the high voltage cable
which connects the control unit to the ion pump,
can cause severe injury or death. Before mounting
the high voltage connector of the cable on the
pump high voltage feedthrough, or before remov-
ing it, be sure the main power is removed from the
control unit.
To avoid injury, never connect the high voltage to
the pump before it is installed into the system and
all the inlet flanges are properly connected or
blanked off.
Connect the control unit to the ion pump with the
coaxial high voltage cable assembly as follows:
1. Be sure the garter spring is properly mounted
on the pump high voltage feedthrough since the
ground connection is made through the garter
spring.
2. Push the female end of the cable connector
over the high voltage feedthrough.
3. Lock the connector to the feedthrough brackets
with the screws mounted on the high voltage
connector.
4. Push the male end of the cable connector into
the socket on the control unit rear panel. (Refer
to the control unit instruction manual).
Before removing the high voltage connector of the
cable from the control unit, be sure the main power
is removed from the control unit. Wait at least 10
seconds after removing the main power from the
control unit, to allow capacitors to discharge com-
pletely.
To disconnect the coaxial high voltage cable from
the controller, slide the safety locking sleeve (very
little sleeve travel is required) from the control unit
and at the same time pull on the male end of the
cable connector to remove it from the socket on
the control unit.
17
TECHNICAL INFORMATION
WARNING!
WARNING!
87-900-063-01(C)
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