5-4 Model 3786 Ultrafine Water-based Condensation Particle Counter
Water in the Sample Inlet
Water flowing out of the sample inlet or gurgling inside the inlet may
result from several situations including:
• Tipping of the UWCPC beyond ten degrees.
• A warm humid aerosol sample is condensing within the cooled
inlet.
• The drain reservoir is overfilled.
Water in the inlet can be cleared by removing the inlet assembly,
slipping off the wick, and drying the sample path with a cotton
swab.
The reservoir should be drained.
Some inlet conditioning should be provided to lower the dew-point of
the aerosol sample if the cause of water in the inlet is due to
condensation.
Little or No Water Flows During Drain Cycle
The lack of water flow from the drain port during a drain cycle is an
indication that some reduced pressure exists on the sample inlet or
little or no water is in the reservoir. Water in the drain tube
connecting the UWCPC to the drain bottle can also impede draining.
The Drain bottle must be positioned below the instrument level to
allow proper draining. Remove any connection to the sample inlet
and reinitiate the drain cycle. Alternatively, connect the Vent
connection to the Drain bottle to equalize the pressure. The reservoir
will not drain completely during a drain cycle, but draining can be
assisted by tipping the UWCPC to the side toward the drain port. Do
not tip the UWCPC toward the sample inlet as the internal drain
port connection to the reservoir is on the side. To prepare the
UWCPC for shipment, refer to the Transporting section in Chapter 2,
“
Unpacking and Setting Up the UWCPC,” for details on how to
completely dry the UWCPC.
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