8-8 Model 3775 Condensation Particle Counter
3. Locate the filter in Figure 8-2. Before replacing the filter note
the direction arrow on the filter. It points to the 3-way solenoid
valve that controls the inlet flow operation mode.
4. Remove the tubing from both ends of the filter.
5. Replace the filter with the one in the accessory kit (P/N
1602094), orienting the directional arrow and tubing correctly.
Flow arrow should point to the 3-way solenoid valve.
Makeup Air Filter
The Makeup air filter is identified in Figure 8-3 and is referenced in
the flow schematic,
Figure 5-1. This filter is used to protect the
variable orifice controlling flow at a nominal 1.2 L/min. The
Makeup Air Filter is used during the low-flow operation mode. This
filter is generally not replaced unless the instrument sample flow is
compromised as the filter loads. Makeup air is sampled from
ambient environment.
Figure 8-3
Replacing the Makeup Air 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. Locate the filter in
Figure 8-3.
4. Remove the tubing from both ends of the filter.
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