Maintenance and Service 8-19
Installation of an External Vacuum Pump
It is possible to use an external pump with your CPC. The pump
must provide sufficient vacuum to maintain a critical pressure
across the aerosol flow orifice and bypass/makeup air variable
orifice, while providing adequate inlet flow for instrument operation.
The external vacuum pump must maintain at least 50 kPa (15
in.Hg) of vacuum pressure at 100 kPa (1 standard atmosphere) to
achieve critical flow of 1.5 L/min volumetric flow at the inlet. If
multiple CPCs are connected to the same pump, the inlet flow
specification must be increased accordingly.
Install an external vacuum pump by following the instructions
below:
1. Read warnings and cautions at the beginning of this chapter.
2. Unplug the instrument and remove the instrument cover by
loosening the six side panel screws (they don’t have to be fully
removed). Lift the cover up. Do not remove the screws holding
the clear butanol reservoir cover.
3. Locate the top of the internal vacuum pump shown in
Figure 8-12.
Figure 8-12
Top View of Instrument Showing Pump Top and Pump Inlet and Exhaust Fittings
and Tubing
PUMP
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