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"Many large turbines, power generation equipment and other critical machines are
protected by permanently installed vibration monitoring systems. Typically these
systems analyze peak overall vibration levels in a certain frequency band or bands.
If the overall vibration levels exceed a warning level alarm threshold, an alarm
may sound or a light may flash to notify operators of a change in the machine’s
state. The system may even shut the machine down if it encounters a higher alarm
threshold. The system may also monitor process parameters such as temperature or
pressure with this end in mind."