8-6 Model 3772/3771 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. This filter
should generally be replaced only if it becomes blocked. 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 toward the drain bottle, approximately 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). If the
feature is on and no liquid flows in the liquid column, the micro-pump filter
needs to be changed.
1. Read the warnings and cautions at the beginning of this chapter.
2. Unplug the instrument and lift off the cover by first removing the cover
screws.
3. Find the filter shown in Figure 8-3.
4. Remove the tubing from the barbed fittings at the back and front of the
filter.
5. Replace the filter with the 25 µm filter (P/N 1500192) found in the
accessory kit. This filter has no preferred direction.
Figure 8-3
Replacing the Micro Pump Filter
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