Spectrex Laser Particle Counter

Operation Theory
Utilizing the principle of "near angle light scatter", a revolving laser beam passes through the walls of a glass container or a flow-thru cell.  When it is directed through a central "sensitive zone" the PC-2200 not only counts the particles in suspension, but tabulates their size as well.  The analog signals generated by the light pulses are routed to a computer and digitized.

   
Optical Schematic of the Laser Particle Counter

Calibration
Spectrex provides three sealed calibration standards with each unit.  Each standard contains a precise number of NIST traceable polystyrene spheres of known size in suspension and are sealed with inert Argon gas.  These standards have a proven stability of more than 2 years and provide efficient calibration within 10 minutes.