Introduction to Part 3500/42M 135489-03
The 3500/42M 135489-03 is a dual-channel Vibration Monitor module for the Bently Nevada 3500 system. It is a primary protection module designed to continuously monitor the radial vibration of rotating machinery using signals from proximity probes (eddy current sensors). The module processes these signals to provide key vibration measurements, including peak-to-peak displacement in mils or microns, and provides alerts and danger setpoints to protect the machine from damage due to excessive vibration. It is a fundamental module for machinery protection in critical applications.
Parameters / Specifications
The key technical parameters for the 3500/42M 135489-03 module are summarized in the table below.
| Parameter | Specification | Notes / Explanation |
|---|---|---|
| Model Number | 3500/42M | Bently Nevada Dual-Channel Vibration Monitor |
| Assembly/Revision Code | 135489-03 | Manufacturer's internal assembly and hardware revision number. |
| Product Type | Rack-Mount Monitoring Module | |
| Compatible Rack | Bently Nevada 3500 Rack | Requires a 3500 series frame for operation. |
| Module Slot Size | Single Slot | Occupies one slot in the 3500 rack. |
| Dimensions (H x W x D) | Approx. 193mm x 55mm x 200mm | Standard dimensions for a 3500 series module. |
| Weight | Approx. 0.6 kg (1.3 lbs) | |
| Power Requirement | +24 VDC (from rack backplane) | Powered by the main rack power supplies. |
| Input Signals | From 3500/65 Proximitor® Driver (or 3500/15 Quad Proximitor) | Accepts conditioned signals from proximity probes measuring shaft relative vibration. |
| Input Parameters | Vibration (Peak-Peak), Gap Voltage | |
| Dynamic Range | 0 to 400 µm (0 to 16 mils) peak-to-peak, typical | Configurable full-scale range. |
| Setpoints | 4 programmable setpoints per channel (2 Alert, 2 Danger) | Used for early warning and critical shutdown protection. |
| Outputs | Relay outputs for each setpoint; Buffered analog outputs; OK-to-Relay | Form A or Form C relays for tripping machinery. |
| Keyphasor Input | Required from 3500/25 Keyphasor Module | For phase and speed reference. |
| Front Panel Indicators | OK, Alert, Danger, Bypass, Channel Inhibit | LED status indicators for each channel. |
| Operating Temperature | -20°C to +65°C | Standard for industrial monitoring hardware. |
Application Scenarios
The 3500/42M Vibration Monitor is a cornerstone of machinery protection systems across various industries where monitoring shaft relative vibration is critical for operational safety and asset life.
Turbine Protection: Continuous monitoring of radial vibration on gas and steam turbines in power generation to prevent catastrophic damage from unbalance, misalignment, or shaft rub.
Compressor Monitoring: Protecting centrifugal and axial compressors in oil & gas production, refining, and chemical plants by detecting vibration caused by aerodynamic instability, bearing wear, or other mechanical faults.
Large Pump and Motor Protection: Monitoring critical pumps and motors to detect developing faults and provide an automatic shutdown if vibration levels exceed safe limits.
Turbo-Expanders and Gearboxes: Providing essential vibration protection for high-speed assets where precise shaft motion must be maintained.
Predictive Maintenance Integration: The module's analog and relay outputs integrate with higher-level systems like Bently Nevada's System 1® for advanced diagnostics, trending, and operational data analysis.
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