Bently Nevada 3500/45 176449-04 Sensor Output Proximitor

Description

3500/45 176449-04 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.

3500/45 176449-04 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.

Perform the following procedure to assure proper probe installation. The observed surface must remain motionless while gapping the probe. The probe can be gapped mechanically or electrically. Use either steps a and b or steps a and c.

a. Before installing the probe into its mounting hole, ensure the tapped hole is free of foreign material. If necessary, use an appropriate tap to clean the threads. Before the probe is threaded, disconnect the probe integral cable from the Proximitor or make sure it is free to turn to prevent twisting the lead.

b. The probe can be gapped mechanically. Thread it into the mounting and use a nonmetallic feeler gauge to set the gap. A nonmetallic feeler gauge must be used to prevent scratching of the probe tip or the observed surface.

c. The probe can also be gapped electrically by connecting the probe cable to the Proximitor (see CAUTION below). Apply the proper input voltage (-18 Vdc or -24 Vdc) to the Proximitor. Connect a digital multimeter to the Proximitor output. Thread the probe into the mounting, and observe the transducer output voltage. As the probe is threaded, the transducer output voltage remains low or gives a false reading because it is sensing the surrounding mounting material. See Figure 2-3. As the probe tip extends through the mounting, the transducer output voltage will increase to its maximum output and then decrease as it approaches the observed surface. By cross-referencing this voltage with the probe calibration curve in Appendix C, the proper gap can be set.

d. When the probe is properly gapped, secure it by tightening the jam nut (locknut). Care should be taken so the jam nut is not secured so tightly the threads are stripped.

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