Bently Nevada P3403893-0351 Vibration Transmitter

The Bently Nevada P3403893-0351, also cataloged as the P3403893 Vibration Transmitter, operates as a dedicated hardware component for continuous overall vibration conditioning within Bently Nevada machinery protection loops. It converts dynamic transducer vibration signals into a standardized 2-wire 4-20 mA current output proportional to measured seismic motion.

Hardware Specifications

Eddy-Current Probe Scaling and Rotor Dynamics Integration

The Bently Nevada P3403893-0351 integrates seismic acceleration or velocity signals into a loop-powered current output that complements eddy-current probe scaling metrics used in proximity monitoring. While proximity probes evaluate gap voltage validation (-10 VDC targets) for relative shaft displacement, this transmitter processes absolute structural vibration parameters. Combining housing vibration telemetry with eddy-current dynamic tracking allows control platforms to evaluate total rotor dynamics while maintaining signal isolation and cross-talk suppression.

Frequently Asked Questions

Q: How is loop power supplied to the P3403893-0351 vibration transmitter?

A: The device utilizes a 2-wire circuit configuration where power (12 to 35 VDC) and the 4-20 mA proportional analog output signal share the same wire pair.

Q: What grounding procedure should be followed for the 2-wire loop cable shield?

A: Connect the cable shield to the instrumentation earth ground at the monitoring panel end only, leaving the shield ungrounded at the transmitter to prevent ground loops.

Q: Can the 4-20 mA current output be connected directly to standard PLC or DCS analog input cards?

A: Yes, the 4-20 mA current loop interfaces directly with standard single-ended or differential analog input channels powered by a 24 VDC external loop supply.

Field Installation Guidelines

• Mount the transmitter casing securely to a rigid structural surface on the bearing housing using proper mounting studs to ensure accurate vibration transmission.
• Route the 2-wire shielded cable through grounded metallic conduit away from high-voltage AC power lines and variable frequency drives.
• Verify that loop supply voltage remains between 12 VDC and 35 VDC at the transmitter terminals under maximum current load (20 mA).
• Terminate shield wiring at a single designated cabinet ground bar to maintain signal integrity and eliminate high-frequency noise.