Vibration Sensors

Vibration sensors are available to measure either bearing vibration or shaft vibration direction directly. Direct measurement of shaft vibration is desirable for machines with stiff bearing supports where bearing-cap measurements will be only a fraction of the shaft vibration. Pumps and motors 1000 hp and larger may have the following vibration monitoring equipment (Wahren, 1997):

• A seismic pickup with double set points installed on the pump outboard housing

• Proximators with x-y vibration probes complete with interconnecting coaxial cables at each radial and thrust journal bearing

• Key phasor with proximator and interconnecting coaxial cables

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