Four-Channel Machinery Protection Monitor for Proximity and Seismic Transducers
The Bently Nevada 3500/42-01-00 Proximitor/Seismic Monitor is a four-channel monitoring module in the 3500 Machinery Protection System. It accepts inputs from proximity probes and seismic transducers, conditions the signals, calculates vibration and position measurements, and continuously compares them against user-configurable alarm setpoints to protect critical rotating machinery.
The complete assembly 3500/42-01-00 consists of:
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176449-02 – 3500/42M Proximitor/Seismic Monitor Module
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128229-01 – Proximitor/Seismic I/O Module with internal terminations
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model | 3500/42-01-00 |
| Monitor Module | 176449-02 |
| I/O Module | 128229-01 |
| Product Type | Proximitor/Seismic Monitor |
| Number of Channels | 4 |
| I/O Configuration | Internal Terminations |
| Transducer Inputs | Proximity probes, Accelerometers, Seismoprobes®, Velomitors* |
| Rack Compatibility | Bently Nevada 3500 Series Rack |
| Configuration Software | 3500 Rack Configuration Software |
| Machinery Protection | API 670 compatible applications |
| Agency Approval | 00 – None |
Typical Applications
The 3500/42-01-00 is commonly installed on:
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Steam turbines
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Gas turbines
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Centrifugal compressors
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Pumps
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Electric motors
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Generators
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Gearboxes
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Industrial fans
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Large rotating process equipment
Key Features
Four Independent Monitoring Channels
The monitor accepts four sensor inputs and processes them independently while allowing paired-channel configuration for multiple machinery protection functions.
Multiple Sensor Compatibility
Supports input from:
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Bently Nevada Proximity Probes
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Accelerometers
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Seismoprobes®
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Velomitor® sensors (supported but generally not recommended for new systems)
Continuous Machinery Protection
The monitor continuously compares measured values against configurable Alert and Danger alarm setpoints to provide real-time protection of rotating equipment.
Internal Termination I/O
The 128229-01 I/O module provides internal field wiring terminations, simplifying rack installation and maintenance.
3500 System Integration
The module integrates seamlessly into the Bently Nevada 3500 Machinery Protection System, communicating with rack power supplies, displays, communication gateways, and System 1 software.
API 670 Applications
The 3500/42M is widely deployed in API 670-compliant machinery protection systems for critical rotating assets.
Frequently Asked Questions
1. What components are included in 3500/42-01-00?
The complete assembly includes:
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176449-02 Proximitor/Seismic Monitor
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128229-01 Proximitor/Seismic I/O Module with internal terminations.
2. How many channels does the monitor support?
The module provides four independent monitoring channels.
3. Which sensors can be connected?
Compatible sensors include:
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Proximity probes
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Accelerometers
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Seismoprobes®
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Velomitor® sensors (legacy support).
4. What measurements can it perform?
It supports radial vibration, thrust position, acceleration, velocity, shaft absolute vibration, differential expansion, eccentricity, REBAM, and circular acceptance region measurements.
5. What does the "-01" option indicate?
The 01 option specifies an internal termination Prox/Seismic I/O Module (128229-01).
6. What does the "-00" option indicate?
The 00 suffix indicates no agency approvals. Versions with other suffixes (such as CN) provide regional certification options.
7. Is the module configurable?
Yes. Each channel is configured using the 3500 Rack Configuration Software, allowing flexible assignment of measurement types and alarm setpoints.
8. Is the 3500/42M suitable for machinery protection?
Yes. It is specifically designed for continuous online machinery protection and condition monitoring in critical industrial applications.
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