72945-02 BENTLY NEVADA  Termination Unit

Proper installation requires the observed surface to be free of irregularities such as hammer marks, scratches, holes, or keyways. Any type of plating (including chrome) normally results in a nonuniform plating thickness. Residual magnetism, surface irregularities, and other conditions in the observed surface can cause electrical or mechanical runout which will introduce error in the Proximitor output. The various techniques for eliminating electrical and mechanical runout are described in several papers available from Bently Nevada Corporation, including: • Dealing with "Glitch". Where does Electronic Vectorial Runout Compensation Fit In? (Application Note 004) • "Glitch": Definition of and Methods for Correction, including Shaft Burnishing to Remove Electrical Runout. (Application Note 011) The electromagnetic fields of probe tips mounted too closely together will cross-couple, causing a small amplitude ac signal to be superimposed on the Proximitor outputs. To prevent cross-coupling mount the probes so that the distance between the tips is at least as large as that shown in the Figure 2-1.

Brackets or other structural members used to mount probes must be rigid. When using a mounting bracket, it should be field checked for resonant frequency. The resonant frequency should be at least ten times machine running speed. Brackets must support the probe in a position perpendicular to the observed surface. The probe axis can vary 15 degrees from perpendicular without affecting the performance of the transducer system. Probes may be mounted through existing machine hardware such as the bearing cover of a machine case. Many times it is advantageous to use an external mounting adapter, allowing the probes to be removed and replaced, or gapped again without taking the machine apart. For more information on mounting brackets and adapters, contact your nearest Bently Nevada office for information on transducer accessories.

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