8-20 Model 3775 Condensation Particle Counter
4. Disconnect tubing from the barbed fittings shown in
Figure 8-12.
5. Using a polyethylene tee having
3
⁄16” tube barbs to connect the
tubes as shown in
Figure 8-13.
6. Connect your external vacuum pump to the Makeup Air port at
the back of the CPC using plastic tubing capable of providing
high vacuum without collapsing under the vacuum load.
7. Replace the cover and tighten the cover screws.
8. When operating the instrument, turn the internal vacuum
pump off.
Figure 8-13
View of Instrument Interior Showing Tee Connection for External Pump
False Count Check
If you find that the CPC is continually counting a lot of particles
even with a high efficiency (HEPA or ULPA) filter on the inlet, the
CPC may have developed a leak or the aerosol flow path may have
become contaminated with butanol.
To eliminate the possibility of butanol contamination, follow the
directions in the following section for “
Flooded Instrument.” If the
false count problem continues, it is most likely due to a leak.
Contact TSI for assistance.
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