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How the ISO Cleanliness Code is Determined :

When oil analysis samples are submitted to particle counting, automatic particle counting (APC) is typically used — the current calibration standard for APC is ISO 11171. In APC, particles are counted through either laser or pore blockage methods. Different laboratories may report different particle count micron levels. As an example, a lab report may include levels greater than 4, 6, 10, 14, 21, 38, 70 and 100 microns.

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ISO 4406:99 is the reporting standard for fluid cleanliness. According to this standard, a code number is assigned to particle count values derived at three different micron levels: greater than 4 microns, greater than 6 microns and greater than 14 microns. The ISO code is assigned based upon Table 1. This can be seen in the example on the left.

However, without seeing the raw data, the only thing the ISO code can positively identify is whether a sample has achieved the desired target value. The ISO code does nothing to help determine any real trend information unless the value of the raw data at the given micron levels changes enough to raise or lower the ISO code.

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