3-4 Model 3786 Ultrafine Water-based Condensation Particle Counter
Status Indicator Lights
Four lights above the display provide a quick indication of the
UWCPC’s current operating status.
Particle
The particle light is flashed for each particle detected. At particle
concentrations in excess of about 5.0 #/cm
3
the flashes turn to a
continuous glow.
Status
A steady glow of the status light indicates that the instrument has
warmed to its operating temperatures and the laser is running at
its normal operating power. A slow blinking of the light (1/second)
is displayed when the operating temperatures are not within
normal operating values. The indicator blinks fast (3/sec) when the
internal laser is either turned off or otherwise not able to operate at
its required power output setting.
Flow
The flow indicator displays a steady glow when the current aerosol
flow rate is within ten percent of its nominal value of
300 cm
3
/minute. The light will rapidly flash when the flow exceeds
110% of its nominal flow and it will flash slowly if the flow rate
drops below 90%. The light will be turned off if the pump is
switched off.
Liquid
The liquid indicator will be lit during normal operation when the
drain reservoir is not full and the growth tube is not dry. The
indicator will flash slowly when the drain reservoir is full and will
be turned off if the full drain condition persists for more than ten
minutes, at which time water injection will cease (see Water
Handling). The indicator will flash rapidly if a dry growth tube wick
is detected.
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