8-6 Model 3775 Condensation Particle Counter
Table 8-2
Filter Replacement Schedule
Filter Name (TSI Part Number)
Replacement Schedule
(Operation Time)
Exhaust Filter (1602094)* 2000 hours
Bypass Filter (1602094) >2000 hours
Makeup Air Filter (1602088) 1500 hours
Butanol Fill (1602088) 2000 hours
Micro-pump Filter (1500192) As necessary
*Part numbers are listed for reference only. Replacement filters are
ordered from TSI as Replacement Filter Kit P/N 1031488.
Exhaust Filter
The Exhaust Filter is mounted at the back panel as shown in
Figure 8-1. This filter removes particles in the air stream
exhausting the instrument from the internal vacuum pump. This
filter does not require replacement unless instrument sample flow
is compromised as the filter loads. A drop in the nozzle differential
pressure or reduction in inlet sample flow may indicate a plugged
exhaust filter.
Figure 8-1
Replacing the Exhaust Filter
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. Before replacing the filter, note the direction arrow on the filter
that points to the back of the instrument.
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