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Consistency in vibration data collection is one of the most important aspects of reciprocating machinery analysis. These tips and tricks will help you to ensure the integrity of your data is sustained and trend-able, regardless of who is performing the data collection routines at your location:
First, it is critical the accelerometer is mounted on the same location every time. This location should be plainly marked, using a paint marker, if possible.
If a smooth machined surface (larger than the size of a quarter) is available, use the rate earth (small) magnet to mount your accelerometer.
If the surface is irregular, the rail magnet (large) can be used, but ensure that the magnet is clamping firmly and will not rock.
Remember that rough surfaces, paint, dirt, sludge, etc... can all contribute to reduced vibration amplitudes, possibly causing data to trend the wrong way. One way to work around this would be to epoxy a small flat washer to the component. If corrosion of the washer is a concern, consider some of the 400 series stainless steels which have magnetic qualities.
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