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248083440-1 Rev 5 2-1
2 Introduction
Overview This operating manual introduces the Lighthouse ApexPortable
family of portable Airborne Particle Counters and includes instructions
for inspecting, installing, using and maintaining the instrument.
Description The ApexPortable instrument comes standard with four particle-size
channels of 0.3, 0.5, 1.0 and 5.0 microns (
ApexP3) and 0.5, 1.0, 5.0
and 10.0 microns (
ApexP5) with a flow of 1.0 CFM. Figure 2-1 shows
the standard configuration. Figure 2-1 lists features and specifics about
the
ApexP3 and Table 2-2 lists the ApexP5.
Figure 2-1 ApexPortable Airborne Particle Counter
The instrument uses a LASER diode light source and LASER beam
shaping optics to illuminate a cross section of the air flow path. As
particles move along this path, they cross the LASER beam and scatter
light. The light scattered is collected by an optical imaging system onto
a photodiode. The photodiode converts the image into a current which
is converted to a voltage and amplified by an electronic circuit.
The result is the electronic circuit outputs a voltage pulse each time a
particle crosses the LASER beam. The amplitude of the voltage pulse
is proportional to the light scattered which in turn is proportional to the
size of the particle.
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