Bently Nevada 177230-00-01-CN Seismic Transmitter

Description

Integrating directly into PLC, DCS, or SCADA control architectures, the Bently Nevada 177230-00-01-CN serves as a loop-powered seismic transmitter designed for continuous vibration monitoring of industrial rotating machinery. This velocity-based transmitter utilizes a piezo-electric accelerometer with onboard signal conditioning to produce a 4 to 20 mA analog output proportional to the overall vibration velocity. Encased in a rugged, hermetically sealed 316L stainless steel housing, it is engineered for long-term deployment in high-reliability industrial environments, providing immediate protection and diagnostics for balance-of-plant assets.

Features

• Direct Interface: Eliminates the need for specialized monitoring monitors by transmitting a direct 4 to 20 mA loop-powered signal to any standard input card.
• Hermetic Seal: Built with 316L stainless steel housing and a 3-pin MIL-C-5015 top connector, guaranteeing ingress protection in high-moisture settings up to 100% relative humidity.
• High-Fidelity Signal: Onboard electronics process raw piezo-electric charge output to accurately represent vibration velocity across the defined frequency band.
• Solid-State Durability: No moving internal components, minimizing wear-and-tear drift and ensuring consistent, long-term calibration stability.

Applications

• Balance-of-plant rotating machinery, including industrial fans and blowers.
• Continuous monitoring of centrifugal and reciprocating fluid pumps.
• Medium-to-large electric motors, generators, and auxiliary gearboxes.
• Air and process gas compressors.

Technical Specifications Table

Connections and Interfaces

Alternative Models & Compatibility

This transmitter acts as a standardized replacement for legacy case velocity transducers when direct-to-PLC output is desired. Note that the 177230 series outputs a 4 to 20 mA DC current corresponding to overall root-mean-square (RMS) velocity, meaning it cannot directly drive legacy dynamic vibration monitors (such as Bently Nevada 3500/42M modules configured for dynamic inputs) without proper module configuration for static analog signals.

Application Pitfalls & Engineering Notes

Do not mount this transmitter on flexible machine casings or thin plate sections. Doing so can introduce high-frequency structural resonances that do not represent true bearing housing movement, causing false high readings. The sensor must be bolted to a solid, flat, machined surface directly on or near the machine's bearing housing to ensure accurate mechanical energy transfer.

Commissioning & Wiring Tips

To guarantee optimal high-frequency signal coupling, ensure the mounting surface is completely free of debris and paint. Apply a thin layer of silicone grease to the 1/4-28 UNF mounting stud before installation. Cable runs should be completed using high-quality twisted, shielded pair cabling. Ground the shield at the receiver (PLC/DCS) chassis ground only to prevent ground loops that cause noise injection on the loop current signal.

Installation Guidelines