http://www.sdt.eu Poorly lubricated bearings are a primary contributor of premature machinery failure. Companies looking to optimize lubrication practices have adopted a conditional approach. By monitoring the friction levels of bearings with ultrasound they can determine when the lubricant has deteriorated and needs replacement. Trending against an establish decibel value, increased friction levels are quickly spotted and alarms triggered. It becomes a standard practice to sort good bearings from those that require the attention of the lubrication technician.