Gas ballasting the roughing pump 5-17
2. Run the pump for 30 to 60 minutes.
Tip: It is normal for the roughing pump temperature to increase during
ballasting. To maintain an ambient temperature of 40 °C (104 °F)
where the pump is located, ensure there is adequate ventilation.
3. Use the flat-blade screwdriver to turn the gas ballast valve to the closed,
, position.
Gas ballasting a pump fitted with a handle-operated gas ballast
valve
To gas ballast the roughing pump
1. Move the gas ballast valve handle on the pump a counterclockwise from
the horizontal position to the vertical 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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