The purpose of the Key Phasor module in a Vibration Monitoring System is to act as the reference point for phase on a machine train. Using this reference point, the vibration phase of other sensors on the machine train can be deduced. Usually the Keyphasor sensor is a non contact eddy current type probe.
How does a keyphasor work?
A Keyphasor signal is an electrical pulse generated once per revolution (or at a specified interval) of a rotating shaft. It is produced by a sensor (often an optical or magnetic pickup) that detects a physical marker (such as a gear tooth, a keyway, or a reflective marker) attached to the shaft or coupling
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