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7.10
Vacuum System for Cell Harvesting:
7.11
System Components
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7.12
System Operation
The vacuum system provides high throughput flow wich allows up to 96+ sample system to be handled. The
attached inlet trap is provided to inhibit the accidental ingestion of liquid into the pump.
Vacuum level is preset at 26"Hg when the inlet is plugged with a rubber stopper. The vacuum gauge provided
allows to check the vacuum level -- that is pressure below atmospheric. The reference point for the vacuum
gauge is atmospheric pressure. Please keep in mind that atmospheric pressure tends to vary from day to day.
As a result of this variability, the dial vacuum gauge will indicate slightly different maximum vacuum
readings from day to day.
The preset vacuum level may be adjusted by opening or closing the orifice. A small leak through the orifice is
provided to allow easy restart of the pump if you are turning off then immediatly turning on the pump as is
found with some cell harvesting applications.
By turning clockwise the screw located on top of the orifice, the vacuum level can be dropped to as low as
27.6". The deeper vacuum is particulary useful for removing sticky or viscous substance. If you close off the
orifice, please keep in mind this will lead to restart problems if you are turning off then imediatly turning on
the pump. If you encounter a restart problem after closing the orifice, you will need to incorporate into your
procedure bringing the cell harvester up to atmospheric prior to restarting of the pump.
Section 7: APPLICATION INFORMATION
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19
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