5-16 Maintenance Procedures
Your roughing pump can be fitted with either of the following:
• A screwdriver-operated gas ballast valve. See “Gas ballasting a pump
fitted with a screwdriver-operated gas ballast valve” on page 5-16.
• A handle-operated gas ballast valve. See “Gas ballasting a pump fitted
with a handle-operated gas ballast valve” on page 5-17.
Gas ballasting a pump fitted with a screwdriver-operated gas
ballast valve
Required material: Flat-blade screwdriver
To gas ballast the roughing pump
1. Use the flat-blade screwdriver to turn the gas ballast valve on the pump
a quarter-turn to the open, , position.
Warning: To avoid burn injuries, take great care while working with
the roughing pump: it can be hot.
Caution: To avoid damage,
• do not vent the instrument when the roughing pump is gas
ballasting.
• do not gas ballast the roughing pump while the instrument is in
Operate mode.
• avoid gas ballasting the roughing pump for more than 2 hours.
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