Introduction
The components with part numbers 3500/42-09-00 140734-02 and 3500/42-09-00 140471-01 are monitoring modules within the Bently Nevada* 3500 Machinery Protection System. These part numbers refer to specific versions or hardware revisions of the 3500/42 Proximitor® Seismic Monitor.
This module is a versatile, dual-channel monitor designed to interface with both proximity probes (for relative shaft vibration/position) and seismic transducers (for absolute casing vibration). It provides continuous surveillance, programmable alarm and danger setpoints, and can initiate a machinery shutdown to protect critical assets from damage. The different suffixes (140734-02 vs. 140471-01) typically indicate different firmware revisions, manufacturing lots, or minor hardware improvements.
*Bently Nevada is a part of Baker Hughes.
Parameters
The following table outlines the key technical parameters for the 3500/42-09-00 monitor platform.
| Parameter | Specification |
|---|---|
| Part Number | 3500/42-09-00 140734-02 / 3500/42-09-00 140471-01 |
| Module Type | Dual-Channel Proximitor / Seismic Monitor |
| Compatibility | Bently Nevada 3500 Series Racks |
| Number of Channels | 2 |
| Proximitor® Power | Provides -24 VDC power to proximity probes (per API 670 standard). |
| Input Types | Channel A: Proximity probe input for radial vibration or position. Channel B: Configurable for either a proximity probe input or a seismic (velocity/acceleration) input. |
| Programmable Functions | Radial Vibration, Thrust Position, Acceleration, Velocity, and more. |
| Dynamic Signal Output | Provides buffered dynamic signals for analysis (waveforms and spectra). |
| Primary Function | Monitors both relative and absolute vibration; provides programmable alarms (Alert and Danger) for machinery protection. |
| Power Requirement | Powered directly from the 3500 rack backplane. |
| Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 200 mm (7.5 in x 1.6 in x 7.9 in) *Standard 3500 Series full-size module slot.* |
| Weight | Approx. 0.45 kg (1.0 lb) |
Application Scenarios
The 3500/42 is one of the most common and flexible protection modules, used in a vast range of applications where both shaft and casing vibration need to be monitored. Key scenarios include:
Complete Machine Train Protection:
Used on turbines, compressors, and large pumps to monitor radial shaft vibration (via proximity probes on Channel A) and casing vibration (via a seismometer on Channel B) simultaneously.
Radial Vibration and Thrust Position Monitoring:
Configuring both channels for proximity probes to monitor two axes of radial vibration (X and Y) on a single bearing, or to monitor radial vibration on one channel and thrust position on the other.
API 670 Compliant Machinery Protection:
A standard choice for systems designed to meet API 670 standards, providing the required monitoring functions for both relative and absolute vibration on critical equipment.
Integrated Alarm and Shutdown Functions:
Serves as the primary protection device. If a dangerous condition is detected (e.g., high shaft vibration), it triggers an alarm or a shutdown signal.
Providing Data for Diagnostics:
The dynamic signal outputs allow engineers to collect detailed waveform and spectrum data for in-depth fault diagnosis.
Typical Machinery Protected:
Steam and Gas Turbines
Centrifugal and Axial Compressors
Large Pumps, Fans, and Motors
Generators
Gearboxes
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