Overview
The Bently Nevada 3500/42-01-01 Proximitor/Seismic Monitor is a four-channel machinery protection monitor for the 3500 Machinery Protection System. It accepts inputs from both proximity transducers and seismic sensors, conditions the signals, and continuously compares measured values against user-configurable Alert and Danger alarm setpoints. The monitor is designed to provide continuous protection and condition monitoring for critical rotating equipment.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 3500/42-01-01 |
| Product Type | Proximitor/Seismic Monitor |
| Series | 3500 Machinery Protection System |
| Channels | 4 |
| Monitor Type | Four-channel programmable monitor |
| Power Consumption | Approximately 7.7 W (typical) |
| Input Signals | Proximity probes, accelerometers, velocity transducers |
| Buffered Outputs | One buffered output per channel |
| Recorder Outputs | 4–20 mA proportional outputs |
| Configuration | 3500 Rack Configuration Software |
| Mounting | 3500 Rack Module |
Typical Applications
The 3500/42-01-01 is commonly used 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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Gearboxes
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Generators
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Fans and blowers
Typical monitoring applications include:
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Shaft vibration
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Casing vibration
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Axial thrust position
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Differential expansion
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Bearing condition monitoring
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Machinery protection
Key Features
Four Independent Monitoring Channels
Provides four programmable channels capable of monitoring multiple machine protection parameters simultaneously.
Supports Multiple Sensor Types
Compatible with:
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Bently Nevada Proximitor® Systems
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Accelerometers
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Velocity transducers
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Seismoprobe® sensors
This flexibility allows one monitor to support a wide range of machinery applications.
Programmable Alarm Protection
Each channel supports configurable Alert and Danger alarm setpoints for continuous machine protection and automatic alarm generation.
Buffered Outputs
Front-panel buffered outputs enable direct connection of portable analyzers and diagnostic equipment without interrupting system operation.
4–20 mA Recorder Outputs
Each channel provides an isolated 4–20 mA output for integration with plant DCS, PLC, or SCADA systems.
API 670 Machinery Protection
The 3500 Series is widely used to meet API 670 requirements for continuous monitoring of critical rotating machinery in industrial facilities.
Frequently Asked Questions
1. What does the 3500/42-01-01 monitor do?
It continuously monitors vibration and position signals from proximity and seismic sensors, compares them against configured alarm limits, and provides protection for rotating machinery.
2. How many channels does it support?
It is a four-channel monitor.
3. Which sensors are compatible?
It accepts inputs from:
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Proximity probes
-
Accelerometers
-
Velocity transducers
-
Seismoprobe® sensors
4. What does the "01-01" configuration indicate?
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First 01: Prox/Seismic I/O module with internal terminations (128229-01)
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Second 01: cNRTLus Class I, Division 2 hazardous-area approval.
5. Does it provide buffered outputs?
Yes. Each channel includes a front-panel buffered transducer output for diagnostics.
6. Can it output 4–20 mA signals?
Yes. Each channel provides a proportional 4–20 mA recorder output for control system integration.
7. How is the monitor configured?
Configuration is performed using 3500 Rack Configuration Software, allowing programming of measurement types, alarms, and channel functions.
8. Is it suitable for API 670 applications?
Yes. The 3500 Series is widely deployed in API 670 compliant machinery protection systems.
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