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Technical Information
Gas Ballast
When pumping gas loads containing water vapor or condensible gases, use the gas
ballast. To activate gas ballast (may be removed using a 9/16 nut driver), remove
the solid 1/4 NPT plug from either port 1 or port 2, and install the sintered filter plug
provided with the pump (see Figure 8 "Outline Drawing and Principal Items").
Figure 33 Gas Ballast
Figure above shows the Gas Ballast plug assembly in both ports 1 and 2.
If hazardous materials are pumped, do not use gas ballast.
CAUTION
Gas ballast port 1 is used for moderate water vapor loads, such as intermittently
pumping out a volume exposed to normal ambient humidity. Gas ballast port 2 is
used for high water vapor loads, such as repetitively pumping out a volume
exposed to excessive ambient humidity, or process gas loads with a high water
vapor content. With both gas ballast 1 and gas ballast 2 in use, up to 120 g/hr water
vapor can be handled. If both gas ballast 1 and gas ballast 2 are open (plugs
removed, allowing for air flow), the sintered filter plug should be installed in the gas
ballast 2 location instead of the gas ballast 1 location.
For applications where ingress of air is undesirable, dry nitrogen at a flow rate of
approximately 5 l/min can be provided to the gas ballast inlet by making a 1/4 NPT
connection to the port. If either gas ballast is to be used for only short intervals, the
removable insert may be taken out of the gas ballast without removing the entire
plug. By removing this insert (may be removed using a 1/8" hex wrench), the gas
ballast allows for air flow through the brass orifice. There is no need to remove the
brass orifice (see Figure 10)
Pumping high water vapor loads can cause a temporary increase in ultimate
pressure, due to adsorption and absorption of water vapor by the internal
CAUTION
surfaces of the pump. Pumping water vapor loads in excess of the water vapor
handling capability of the gas ballast can cause reduced time between tip seal
replacements.
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Agilent IDP-10 Dry Scroll Vacuum Pump User Manual
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