![]() Fluids used in mobile fluid power systems are typically formulated to contain high antifoam concentrations. Silicone-based antifoam agents such as polydimethylsiloxane are common additives causing problems. Phantom particle counting is a documented problem, encountered when using laser-based LBM particle counters to verify the cleanliness of mineral based fluids containing certain insoluble additives. How is this possible? What you’re likely experiencing is a classic case of “phantom” particle counting. You even went through the trouble of making sure there was an element actually in the filter. You’ve checked that the filter element is not clogged and not in bypass. After eight hours, the cleanliness has only dropped to 22/20/13. You have been using a laser light-blockage method (LBM), automatic particle counter to verify the fluid cleanliness. IMAGINE THIS: You have been filtering 150 litres of hydraulic fluid off-line with staged 5 and 1 micron filter elements at a rate of 25 litres per minute (1,500 litres per hour). The increased use of siloxane based anti-foaming agents is causing issues with laser counter technology.
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