4-8 Model 3775 Condensation Particle Counter
Butanol
Consumption
The water removal feature removes condensed
butanol as well as water, increasing butanol
consumption. The operator may elect not to use
water removal in cool/dry environments, to preserve
butanol. When water removal is not used, butanol is
recycled.
A full bottle of butanol (1 liter) lasts about three
weeks (35
°C, 90% RH) with the water removal system
ON, about six weeks (room condition) when water
removal system is OFF.
Inlet Flow Mode
Select this option and turn the knob to select between High and
Low aerosol inlet flow modes. High inlet flow is used to reduce
diffusion particle losses which occur in the sample tubing. Low inlet
flow is preferred when the CPC is used as part of an SMPS system
to measure particles in a wider size range. The nominal flow rate is
1.5 L/min for high flow mode and 0.3 L/min for low flow mode.
Totalizer Mode
This operation mode allows particle counts to be accumulated and
displayed as shown in Figure 4-6. Totalizer mode is generally useful
for tests at very low particle concentrations, such as evaluation of
high efficiency filters. Depress the control knob to turn on the
Totalizer Mode. Totalizer Mode Screen is displayed as shown in
Figure 4-6. The CPC will count time and particles once the START
button is selected. Concentration is calculated from the time and
count data.
Figure 4-6
Totalizer Mode Data Screen
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