Particle Counting - Bottle Sampling vs. Online Counters
Technicians who uses online particle counters on oil systems, can sometime wonder, whether the ISO codes are correct, being lower than the equivalent ISO code based on a bottle sample. This is especially true when the oil system is small and fitted with a very efficient “over-dimensioned” offline filter e.g. running 50 percent circulation ratio per hour. When comparing to bottle sampling, there will always be a difference in ISO codes, but this becomes very significant when the oil system is really clean. This article will explain why this can be the case.