Agilent IDP-3 Mode D'emploi page 167

Technical Information
Mechanical Connections
Pump Inlet
Use NW16, or larger, clean vacuum hardware with as short a length as practical
between the pump and vacuum chamber.
Insert a bellows or flexible vacuum hose between the pump and vacuum chamber
to provide both vibration isolation and strain relief.
Pump Exhaust
A female 1/4" National Pipe Thread exhaust fitting is located on the front of the
pump. Additionally, a 10 mm (3/8") hose barb fitting is provided. To avoid
overheating the pump, do not restrict the exhaust flow with long lengths of small
diameter tubing. Use as short as practical lengths of 10 mm ID, or larger, diameter
hardware.
Gas Ballast
The standard configuration of this pump is shipped with the gas ballast port sealed
off by a 1/4-20 thread screw (item 6 on Figure 17 on page 159). This configuration
is suitable for relatively dry applications, however, in presence of water vapour,
solvents, etc., are being pumped, remove the seal screw and replace it with the
provided adapter and 1/8" NPT sintered filter plug. Do not exceed 25 in-lb of torque
when installing the adapter into the manifold.
For applications where the ingress of atmospheric air is undesirable, dry nitrogen at
a flow rate of approximately 5 l/min can be provided to the gas ballast. Remove the
1/8" NPT sintered filter plug from the adapter and replace it with an appropriate
fitting (supplied by end user).
WARNING
The gas ballast must be sealed whenever pumping any gas not intended
to be vented to atmosphere.
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