New hydraulic fluid delivered in a barrel: up to 23/21/18 “This is to be expected since the code to the right excludes smaller particulate sizes that are covered in the code on the left (higher particulate counts in the left code).” “On the other hand, if the code goes down by one, the amount of particulates in a particular size range would be cut in half.”īrown explained that the normal ISO code has three numbers that are declining in value from left to right, covering the 4, 6, 14 Micron and larger size particulates. the 22 in example above increased to 23, would mean that the number of 4 Micron, and larger particulates would be doubled,” he said. “This explains how the ISO code is determined for a particular fluid sample,” he said. Matt Brown Product Manager Filter Systems at Schroeder Industries gives the following table as an example. > 4 μm, > 6 μm and > 14 μm, and coded for easy comparison. Particle counts are determined cumulatively, i.e. The objective of the ISO 4406:1999 is to classify particulate contaminants in hydraulic fluids.
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