Original Post
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Paul,
Instrument under new ISO code reads the following sizes: >4µ, >6µ, >14µ, etc. If you previously read >2µ as the smallest particles, it make sense that the “first” number is higher than before. New ISO code has been introduced primarily from the accuracy reading stand point, because those new sizes are calibrated by the NIST traceable standards. Old standards for calibration of 2µ sizes were not consistant, and therefore, it was no surprise that two instruments could give results that were significantly different in the smallest range. On the other hand, you might be getting high results because the calibration was screwed up. I would advice you to send a sample to an outside commercial lab and verify you reading.
Instrument under new ISO code reads the following sizes: >4µ, >6µ, >14µ, etc. If you previously read >2µ as the smallest particles, it make sense that the “first” number is higher than before. New ISO code has been introduced primarily from the accuracy reading stand point, because those new sizes are calibrated by the NIST traceable standards. Old standards for calibration of 2µ sizes were not consistant, and therefore, it was no surprise that two instruments could give results that were significantly different in the smallest range. On the other hand, you might be getting high results because the calibration was screwed up. I would advice you to send a sample to an outside commercial lab and verify you reading.
