My understanding of the HiacRoyco APC's is that you can see down to 2um. Anything below that becomes a push. There is a gentlemen out there that may give yoou a better answer. Bob Harsh CET 805-915-2500
Our Hiac has a setting for 100 um. We have never set it up to test any particles that big. We test at >4,6,10,14, and 25 um. Our main concern is in the >6 & 14 um range.
That's my story and I'm sticking to it.
Posts: 54 | Location: Diablo Canyon Pwr. Plt., Calif. USA | Registered: Thu February 05 2004
Originally posted by Global Supplier: Particles less than 2 um have the same size as oil particles and then you would count the oil particles...
..that doesnt make any sense. What is an oil particle? And how is it possible to filter an oil sample through an 0.8µm membrane filter when preparing a particlecount sample for microscopy?
Our LaserNet Fines particle analyzer has a 100µm prefilter and the sample cell is about 100µm. Particles larger than 100µm in analysis is usually very long and thin.
The old ISO was 2/5/15 microns, then it changed to 4/6/16 due to "advances in technology", really meaning, "what we thought was a 2 micron absolute standard is now known to be 4 microns, etc". Read between the lines and you can probably say that 4 microns is the practical lower limit of what particle counting can detect.
