3-6 Model 3775 Condensation Particle Counter
Butanol Fill Port
Butanol is supplied from the butanol fill bottle to the instrument at
the Butanol Fill port quick connect fitting.
Pump Exhaust Port
The air flow containing butanol vapor exhausts from this fitting at
the back panel of the CPC. Pump exhaust should be directed away
from the work area using a piece of tubing connected to this port. A
supplied charcoal filter can be used on a temporary basis to
capture butanol vapor from the exhaust. Care must be taken that
the exhaust port is not blocked. More charcoal filters can be
ordered through TSI (P/N 1031492 and P/N 1031493). See
Chapter 8 “
Maintenance and Service.”
Makeup Air Port
The CPC samples at a rate of 1.5 L/min through the aerosol inlet
during high-flow mode and 0.3 L/min during low-flow mode. To
maintain a consistent pump operation flow during high flow and
low flow operation modes, makeup air (1.2 L/min) is added through
the Makeup Air port during low flow mode operation. The 1.2 L/min
makeup air flow is combined with the 0.3 L/min aerosol flow prior
to the internal vacuum pump.
Drain Port
This port is used to drain the working fluid (butanol) from the
30 cm
3
liquid reservoir and is used when collecting water extracted
using the Water Removal system. See
Chapters 3 and 4 for more on
the water removal feature.
Instrument Cooling Fan
This fan cools internal electronics and dissipates heat generated
during cooling of the condenser. The fan is provided with a guard
and a removable filter that should be cleaned of dust periodically.
Cover
The cover refers to the removable section of the chassis covering the
top and sides of the CPC. It is secured to the chassis with six
screws on the bottom. The six screws can be loosened to remove the
cover and access to the interior of the Model 3775 CPC.
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