SKF Microlog CMVA 60 ULS (Ultra Low Speed) – Where Can It Be Used?

There are laws of electronics and electronic processing that cannot be changed. Any time you are manipulating electrons, there are going to be trade-offs. And if there are not electronic limits to what you want, then there are economic limitations. With the standard model CMVA 60, and the standard 100 mV/Eng accelerometer, there are limitations on the low-end frequency response.

Accelerometer roll off combined with the normal internal electronic noise will produce the often mentioned “ski slope” so that velocity measurements below 100 CPM or so are usually masked.
When the accelerometer is changed for a 500 mV/Eng unit, the low end is improved, but the user wanting to balance a rotor at 20 r/min, for example, is going to have a problem.

The CMVA 60 ULS (Ultra Low Speed) will allow the user to obtain useful velocity information on rotors turning at 12 r/min. The author has stretched this a bit and has collected some data on 6 r/min mixers and, although the 1x signal has a broad base, the signal is usable. The trade-off is a slight increase in data collection time in response to the low frequency signal enhancements made in the CMVA 60 ULS.

We have identified a number of applications where the new data collector should provide results not obtainable from any source outside the laboratory in the past, unless of course you did not have any economic limitations. Without a doubt, as the ULS moves into the field, other applications will come to light and we look forward to hearing from users who have found these additional applications.  Read about these applications in the attached article.