84661-75 Velomitor Piezo-velocity Sensors measure absolute lrelative to free space)bearing housing, casing, or structural vibration. Unlike moving-coil velocitytransducers, such as the Bently Nevada Seismoprobe" family of velocitytransducers, 84661-75Velomitor Piezo-velocity sensors are specialized piezoelectricaccelerometers that incorporate embedded integrated electronics in a solid-state design, Because they incorporate solid-state electronics and have nomoving parts, they do not suffer from mechanical degradation and wear, andcan be mounted vertically, horizontally, or at any other angle of orientation

Application Advisory
if you plan to make housing measurements for overall machine protection.consider the usefulness of the measurement for each application. Mostcommon machine malfunctions (imbalance, misalignment, etc. originate atthe rotor and couse an increase lor at least a change) in rotor vibration. Forany housing measurement to be effective for overall machine protection,the machine must faithfully transmit a sianificant amount of rotor vibrationto the bearing housing or machine casing, or more specifically, to themounting location of the transducer. in addition, you should exercise carein the physical installotion of the transducer. lmproper installation condegrade the transducer's performance, and/or generate signals that do notrepresent actual machine vibration. Integration of the output todisplacement can make this worse. Exercise extreme caution if integratingto displocement in any case.

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