Instrument Operation 4-9
screen as shown in Figure 4-7. If any of the status parameters deviates
from the normal condition, the status light is off and there are two
exclamation marks around the parameter: one before and one after, as
shown in Figure 4-8.
Figure 4-7
Status Display
Figure 4-8
Status Parameter Display for Diagnostics
Saturator Temp (Temperature)
Saturator temperature is 39.0 °C when the instrument warm up is complete
and the instrument has stabilized. The saturator provides saturated butanol
vapor that mixes with aerosol particles in the condenser.
Condenser Temp (Temperature)
Particle growth occurs in the condenser as butanol vapor from the
saturator is cooled, supersaturated, and condenses on sampled aerosol
particles. The condenser temperature is maintained at 22.0 °C.
Optics Temp (Temperature)
The optics temperature is maintained at 40.0 C. This is above the
saturation temperature and prevents butanol from condensing on the
lenses and other internal components in the particle detection optics.
Cabinet Temp (Temperature)
The cabinet temperature measures the temperature inside the CPC.
Ambient Pressure
Ambient pressure is the barometric air pressure in kPa. Inlet air pressure is
very close to the barometric pressure when sampling directly from the
ambient environment. A restriction at the inlet will change the inlet air
pressure. The instrument is designed to operate with an inlet pressure
between 75 and 105 kPa.
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