ISO-4406 Solid Contamination Code
International Standards Organization (ISO)
specifies the code to be used in defining the quantity of solid particles in
the fluid used in a given hydraulic fluid power system. Method
for coding the level of contamination by solid particles. The purpose of
this code is to simplify the reporting of particle count data by converting
the numbers of particles into broad classes or codes, where an increase in one
code is generally a doubling of the contamination level. The code for
particle count comprises the following two-(2) part scales:
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