Particle count

the number of particles present greater than a particular micron size per unit volume of fluid. Selected methods of particle counting are:

automated optical where particles are directly sized and counted using the dispersion or blockage of light created by a solid particle passing between a light source and a sensor
Image analysiswhere stationary particles are directly sized and counted under the microscope by manual or automated systems;
Electrical resistancewhich measures the volume of a particle as it passes through an orifice in an electrically conductive liquid;
Flow decaywhere count and size data is extrapolated from a standard equation applied to the rate at which flow decreases through a screen as particles block it.

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