8-10 Model 3775 Condensation Particle Counter
Micro-Pump Filter
The Micro-pump is used to remove condensed water vapor before it
contaminates butanol in the saturator. The micro-pump filter
protects the pump from contamination which could impede its
performance. The micro-pump filter should generally be replaced
only if it becomes blocked as it requires front panel removal. A
blocked micro-pump filter prevents condensate from being
extracted.
When using the water removal feature it is advisable to check the
drain tubing to the drain bottle to verify liquid movement. The
liquid column will pulse a small amount tword the drain bottle,
aproximatly once per second as the micro-pump actuates. If no
pulsing occurs, first verify that the water removal feature is on (see
“
User Settings” in Chapter 4).
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. The micro-pump filter is accessed from the front of the
instrument. Remove the three screws (see arrows) at the top of
the front panel as shown in
Figure 8-5. Carefully, tip the panel
back, be careful not to bend the sampling inlet.
4. Find the filter shown in
Figure 8-6.
5. Remove the micro-pump filter by carefully removing the tubing
at the ends of the filter barbs. Be careful not to pull the tubing
off the pump fitting or fitting in the saturator.
6. Install a new filter (P/N 1500192) from the accessory kit. This
filter has no preferred direction.
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