Maintaining
78
5
5.2.3 Gas-Ballasting the Rotary Pump
The rotary pump draws large quantities of solvent vapors. The vapors tend to condense in
the pump oil, diminishing pumping efficiency. Gas-ballasting purges condensed
contaminants from the oil.
Gas-ballast the rotary pump when these conditions apply:
•
With ESI operation, once a week
•
With frequent APCI operation, once a day
•
When the pump oil appears cloudy
•
When the vacuum pressure is higher than normal
•
When condensate forms in the rotary pump exhaust line
•
When you change the rotary pump oil
1.
Shut the vacuum system isolation valve, moving its handle fully to the right
(
2.
When the oil is clear, return the gas-ballast control to its normal position.
3.
Open the vacuum system isolation valve (
STOP
Attention:
Failure to routinely gas-ballast the rotary pump shortens oil life and,
consequently, pump life.
STOP
Attention:
Do not vent the instrument when the rotary pump is gas-ballasting.
STOP
Attention:
Do not gas-ballast the rotary pump while the detector is in operational mode.
STOP
Attention:
Never gas-ballast the rotary pump for more than 2 hours.
Summary of Contents for Micromass ZQ 2000
Page 6: ......
