Mechanical Connections - Agilent Technologies TriScroll 800 Installation And Operation Manual

Mechanical Connections

Pump Location
Locate the pump on a firm, level surface.
Clearance mounting holes provided in the frame can be used
to provide permanent attachment. Attach the provided rubber
mounts to the threaded holes at the frame base to minimize
vibration.
Do not to position the equipment so that it is difficult to
operate the disconnecting device.
Vacuum Pump Isolation Valve
Scroll pumps return to atmospheric pressure quickly when
shut off. Thus, an integrated fast acting, automatic, normally
closed isolation valve is standard equipment to prevent pump
debris from being transported back into the vacuum chamber
when the pump is turned off:
The opening of this valve must occur
startup.
Valve closing must occur
The VPI Valve status is controlled by motor operation. The
VPI Valve:
Opens when the pump is running and
Closes when it is stopped due to switch off or overload
protection.
This TriScroll 800 Inverter Scroll pump includes the
necessary communication cable, needed to operate the pump.
Pump Inlet
Use NW40, or larger, clean vacuum hardware with as short a
length as practical between the pump inlet and the vacuum
chamber.
Use a bellows to provide both vibration isolation and strain
relief between the pump and vacuum chamber.
Pump Exhaust
A female 3/8 National Pipe Thread exhaust fitting is located
underneath the scroll module. This fitting swivels 360°.
Additionally, a NW25 adapter is provided with a 3/8 National
Pipe Thread male thread.
Gas Ballast
The pump incorporates an automatic gas ballast to prevent
water and other condensates from accumulating within the
pump. The standard configuration is a sintered filter installed
in the 1/4" National Pipe Thread gas ballast port (item 8 on
Figure 1 on page 30). This allows enough atmospheric air to
enter the pump in order to purge condensates while not
affecting pump ultimate pressure or pumping speed.
For applications where the ingress of atmospheric air is
undesirable, dry nitrogen at a flow rate of
into the gas ballast port. See item 8 on Figure 1 on page 30.
Blocking of the gas ballast port is not recommended.
28

350 ms after pump

250 ms after pump shut off.

5 lpm can be bled
Bearing Purge
A 1/4" National Pipe Thread bearing purge port (item 5 on
Figure 1 on page 30) protects the main crankshaft bearings in
applications where large amounts of water are being pumped.
In the standard configuration, this port is sealed.
To enable the bearing purge, dry nitrogen at a flow rate of
lpm can be bled into the bearing purge port. This gas supply
should be maintained at 2 psig or less and must be kept below
5 psig.
See "Purge Kit" on page 36.
TriScroll 800 Inverter Vacuum Pump
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