When using airborne ultrasound to record readings for trending such as bearing readings, be sure to use the same instrument and serial number of both the ultrasonic receiver and contact probe. Some of the ultrasonic instruments in the marketplace are not "repeatable" from one unit to another. If you lose or break a contact probe and receive a replacement, be sure to disregard those previous readings if the newer contact probe or instruments are not within an acceptable range of 2-3 db's. Some contact probes can vary widely. In other words you may or may not replace a good or failing bearing causing an unexpected downtime. If multiple models exist within your plant be sure to compare the readings to a known source and record those readings for reference.
Tip #2 - Ask your Ultrasonic vendor about repeatability!
Tip provided by Ultra-Sound Technologies, LLC
http://www.ultra-soundtech.com
Tel: (770) 517-8747 Phone
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Posted by beckyp at February 24, 2005 10:39 AM