ApexRp Operators Manual
248083480-1 Rev 3 14
2 Introduction
Overview
This operating manual introduces the Lighthouse ApexRp Remote
Airborne Particle Counter With Pump and includes instructions for
inspecting, installing, using and maintaining the instrument.
Description
The ApexRp instrument comes standard with two channel sizes and a
flow rate of either 1.0 or 0.1 CFM. Optionally, the ApexRp can be
shipped with up to four particle-size channels. Figure 2-1 below
shows the ApexR3p and ApexR03p.
Figure 2-1: ApexR3p and ApexR03p Remote Airborne Particle Counters
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
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