Why measure the vibration of rotating equipment at low speed in acceleration?
It would be appropriate for high RPM machines, very high rpm: with frequencies over 60,000 cpm, but certainly not the 0 to 3600 rpm range advertised by mechanical switch manufacturers. That range just happens to be in your range of speeds but does not agree with the teaching manuals for vibration analysts. 3. If a switch measures in acceleration, and that is best for high speeds, why limit that switch for operation to 3600 rpm? Maybe it is limited by the natural frequency of the mechanism. All devices have natural frequencies. Vibration switches should not have natural frequencies in the range of frequencies generated by the machine they are on. Accelerometers and electronic switches will have by design very high natural frequencies. Components of a mechanical vibration switch are likely to have a very low natural frequency by comparison, perhaps nearer low multiples of running speed. The IMI vibration switch is designed for monitoring radial vibration on your cooling towers at running
