Instruction manual

EXT Split Flow Compound Turbomolecular Pumps
INSTALLATION
PAGE
14
Issue F 14 Mar 07
3.3.2 Inlet-screens (supplied fitted)
Do not remove the inlet-screens unless you can be sure that there is no danger that debris can fall into
the pump. If the screens are removed, the pumping speed through each inlet will increase by
approximately 10%.
To remove an inlet-screen carefully extract it from the inlet-flange using a bent wire hook. To replace a
screen which has been removed, install it as shown in Figure 6, with the BOC Edwards logo uppermost.
Ensure that the dimples on the rim of the screen engage in the groove in the pump flange. If necessary,
gently bend the tabs of the screen outwards to ensure a tight fit.
Figure 6 – Correct installation of inlet screen
3.3.3 Inlet connection and orientation
The pump can be mounted in any attitude range shown in Figure 7, from vertical and upright through to
horizontal (±2
o
), although it is most commonly mounted vertically. If you mount the pump horizontally,
the backing port should point vertically downwards (±20
o
) to reduce the risk of contamination from the
backing pump oil.
Make sure that the pump’s main inlet and side inlet and all components fitted to the pump-inlets are clean
and dust-free. If the pump-inlets are not kept clean, the pump-down time may be increased.
The inlet-connections of the EXT Split Flow Pump are ISO flanges.
WARNING
Removal of inlet-screens will expose the risk of injury from sharp edges.
CAUTION
Do not invert the pump.
1. Inlet-flange 2. Inlet-screen