Velomitor* Piezo-velocity Sensors measure absolute (relative to free space) bearing housing, casing, or structural vibration. Unlike moving-coil velocity transducers, such as the Bently Nevada Seismoprobe* family of velocity transducers, Velomitor Piezo-velocity sensors are specialized piezoelectric accelerometers that incorporate embedded integrated electronics in a solidstate design. Because they incorporate solid-state electronics and have no moving parts, they do not suffer from mechanical degradation and wear, and can be mounted vertically, horizontally, or at any other angle of orientation.
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Application Advisory
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If you plan to make housing measurements for overall machine protection, consider the usefulness of the measurement for each application. Most common machine malfunctions (imbalance, misalignment, etc.) originate at the rotor and cause an increase (or at least a change) in rotor vibration. For any housing measurement to be effective for overall machine protection, the machine must faithfully transmit a significant amount of rotor vibration to the bearing housing or machine casing, or more specifically, to the mounting location of the transducer. In addition, you should exercise care in the physical installation of the transducer. Improper installation can degrade the transducer’s performance, and/or generate signals that do not represent actual machine vibration. Integration of the output to displacement can make this worse. Exercise extreme caution if integrating to displacement in any case.
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