INFORMATION

So what do the ISO codes means?

I only report 2 numbers in ISO code?

What is the difference between 5/15 and 4/6/14?

So what does the ISO code mean?

The ISO code  refer to the  ISO 4406:1999 where a 3 digital code is used to identify cleanliness an example of this is 19/17/13. The first number (19) refers to the number of 4µm particle in a given volume of oil. The second (17) is for the 6µm particles, while the thrid (14) is for the 14µm particles.

Using the table below we can see how the number are allocated. For the sample above we see the there is between 640 - 1300 particles per mL greater than 6µm, which has a code of 17. 

I only report 2 Numbers in the iso code?

I have been asked this a number of times. "But we only report 2 codes" the is the later of the two. Taking the example of 19/17/13, this would be come 17/13 and you will only be reporting the >6µm and >14µm particle. I have notice that many of the OEM's prefer this reporting standard.

What is the difference between 5/15 and 4/6/14 or 6/14?

This has little to do with the reporting and more to do with the calibration. IN 1999 the old calibration standard for particle counters was changed. The old calibration according to the ISO4402, required particle counters to be calibrated at 2µm, 5µm, 10µm, 15µm, 20µm, 25µm, 50µm and 100µm. At this time the reporting standard was the ISO4406. Due to a number of reasons the calibration needed to be change. To reduce the impact on industrial the diameters at which this calibration was also changed to 4µm, 6µm, 10µm, 14µm, 21µm, 25µm, 38µm and 70µm. The ISO code was calculated remained the same the ISO4406 was revised to ISO4406:1999. Therefore in terms of ISO code under the old standard 5 and 15 eg 17/13 should be the smae under the new standard (4)/6/14 eg 17/13. (plus or minus one code).

   

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