Bently Nevada 89477-33 Two-Conductor Twisted Shielded Cable Assembly

The 89477 cable family, specific part number 89477-33, is a high-integrity signal transmission assembly consisting of a two-conductor 18 AWG twisted, shielded cable engineered for critical rotor dynamics vibration monitoring. The physical design features a molded right-angle two-socket electrical plug at the transducer termination end to provide a compact, low-profile connection within tight mechanical spaces, while the monitoring system termination end is fitted with standard terminal lugs for direct interface with I/O chassis blocks. Optimized for low attenuation and high electromagnetic noise immunity, this 10.0 m (33 ft) cable assembly forms an essential signal pathway connecting Bently Nevada machinery protection monitors to structural vibration sensors, including those installed inside a 21128 Velocity Transducer Housing, ensuring accurate transmission of dynamic AC voltage signals without phase distortion or external environmental interference.

Ordering Information

• -33: Cable Length Option
  • 33 ft (10.0 m) nominal cable length.

Hardware Specifications

Engineering Notes

• The twisted-pair geometry explicitly minimizes differential-mode noise induction, which is critical for preserving low-voltage AC velocity or acceleration signals across long processing runs.
• The right-angle two-socket plug enforces a fixed mechanical orientation, reducing physical strain on the transducer connector pin assembly inside protective housing units.
• Calculated electrical properties of the 18 AWG conductors dictate specific capacitance limits per foot; ensure overall loop length calculations fall within monitoring rack input impedance specifications to prevent high-frequency signal roll-off.

Field Guidelines

• Execute correct shield grounding by connecting the cable shield drain wire exclusively to the instrument rack chassis ground, leaving the transducer end completely ungrounded to isolate against ground loops.
• Avoid routing this twisted, shielded signal cable parallel to high-voltage AC three-phase motor lines or heavy switching inductive loads to preserve data integrity and prevent noise injection.
• Observe standard industrial minimum bend radius constraints during conduit installation to protect the internal 18 AWG conductors and shield layering from mechanical shear stress.
• Ensure the right-angle plug is fully seated and threaded tight into the transducer body interface to maintain environmental sealing and prevent terminal contact resistance changes under heavy vibration.