Page 1-2 Lasair II Particle Counter Operations Manual
Chapter 1: Getting Started
Air moves from the sample inlet through the sample chamber. A laser beam is
projected through the sample chamber so that any particles in the sample will scatter
the light. The scattered light energy is picked up by the collecting optics and
converted to a voltage pulse with the amplitude of the voltage pulse corresponding
to the size of the particle.
The incoming particle data is allocated according to size to the appropriate channel.
Both differential and cumulative counts are displayed.
Once sampled, air leaves the sampling chamber, through the pump, and into tubing
leading to a HEPA filter that removes 99.97% of particles 0.3 µm or larger. From
the filter, the sampled air exits through the sample outlet.
Description
The Lasair II particle counter is a portable, lightweight, and durable airborne-
particle counter. Its compact size and comfortable carrying handle enhances its
portability. The Lasair II particle counter can be used for the following applications:
• Cleanroom monitoring
• Facility certification
• Troubleshooting
• Trending analysis
• Statistical process control.
Its external features include a 1/4 VGA color LCD display screen, softkey panels,
sample probe, and a built-in thermal printer.
Depending on the model, the Lasair II particle counter measures particle sizes in
the range of 0.3 to 25.0 µm. It uses six channels with preset thresholds so that you
can size the particle count. The particle counter has an optional Temperature/
Relative Humidity (T/RH) sensor, and up to four analog environmental sensors can
be connected using the 4–20 mA input.
Lasair II particle counter allows you to:
• Set up the sampling, analog data and alarm parameters
• Connect environmental sensors for continual reading
• Start and stop particle sampling
• Display sampling results, counter status, and analog data
• Print sample results
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