General Information about predictive maintenance technologies

Magnetic Vs Stud Mounted Acceleromers?   More times than not, data collectors utilize magnetically mounted sensors to measure vibration data on machinery. While magnets are easy to use and will serve adequately 8 times out of 10, one still must be cautious when using them. Magnets are not infinitely strong and therefore will "let go" at high amplitude vibration and at high frequencies. Click on the link to view an actual example of how using a magnetically mounted accelerometer during a vibration survey negatively affected the quality of data collected. (by the time the error was discovered, it was too late to go back for more!)

Triaxial Vibration Sensors used for predictive maintenance route-based data collection have received a bad rap over the years, mostly from misinformation. Conventional wisdom recommends two radial measurements (horizontal and vertical) and one axial measurement at each bearing. Unfortunately, none of these measurements capture torsional vibration. The only way to see torsional vibration is to mount a tangential sensor to a machine. This is easily done when using a triaxial sensor. Stay tuned for data on this one. A common source of torsional vibration in electric motors is bad rotor bars.

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