Introduction
The component with part number 3500/42-04-00 is a fundamental monitoring module within the Bently Nevada* 3500 Machinery Protection System. This part number refers to the 3500/42 Proximitor® Seismic Monitor, a versatile, dual-channel module designed to interface with both proximity probes and seismic transducers.
Its primary function is to protect critical machinery by continuously monitoring two key parameters: relative shaft vibration (via proximity probes) and absolute casing vibration (via velocity seismometers or accelerometers). It provides programmable alarm and danger setpoints for each channel, and when these setpoints are exceeded, it can trigger alerts in the control room or initiate a machinery shutdown to prevent catastrophic damage.
*Bently Nevada is a part of Baker Hughes.
Parameters
The following table outlines the key technical parameters for the 3500/42-04-00 monitor.
| Parameter | Specification |
|---|---|
| Part Number | 3500/42-04-00 |
| 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: Accepts signals from proximity probes 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, raw 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, providing a comprehensive view of machine health.
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 for machinery protection systems, 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 by continuously comparing monitored signals against safe operating limits. If a dangerous condition is detected (e.g., high shaft vibration or high casing vibration), it triggers an alarm or a shutdown signal.
Providing Data for Diagnostics:
The dynamic signal outputs allow maintenance engineers to connect portable analyzers or online systems to collect detailed waveform and spectrum data for in-depth fault diagnosis without interrupting the protection scheme.
Typical Machinery Protected:
Steam and Gas Turbines
Centrifugal and Axial Compressors
Large Pumps, Fans, and Motors
Generators
Gearboxes
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