Introduction
The Bently Nevada 3500/42-04-00 is a specific configuration of the 3500/42 Speed Monitor, a critical monitoring module within the GE Bently Nevada 3500 Machinery Protection System. This module is designed for the continuous monitoring of rotational speed (RPM) and provides essential overspeed protection for critical rotating machinery.
Its primary function is to process signals from speed sensors (such as magnetic pickups or proximity probes) to determine the rotational speed of a shaft. It provides reliable overspeed and underspeed protection by triggering alarms and initiating machinery shutdown if the speed exceeds or falls below predefined dangerous setpoints. This module is essential for preventing catastrophic damage to assets like turbines, compressors, and large pumps that can occur from overspeed conditions.
Parameters / Specifications
The key technical specifications for the Bently Nevada 3500/42-04-00 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 3500/42-04-00 |
| Product Line | GE Bently Nevada 3500 System |
| Module Type | Speed Monitor |
| Primary Function | Speed (RPM) measurement, overspeed/underspeed protection |
| Number of Channels | 2 independent channels |
| Sensor Input | Accepts passive magnetic pickups (MPUs), prox probes, or photocells |
| Speed Range | 0 to 9999 RPM (or equivalent frequency) |
| Setpoints | 4 programmable setpoints (e.g., Overspeed Trip, Overspeed Alarm, etc.) |
| Relay Outputs | Dedicated relay outputs for alarm and danger setpoints |
| Power Supply | Derived from the 3500 Rack |
| Communication | Via the rack's backplane with the 3500/92 Communication Module |
| Dimensions (H x W) | Standard 3500 Series Module (Approx. 3.9" x 8.7" or 99 mm x 221 mm) |
| Weight (Approx.) | 1.1 lbs (0.5 kg) |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) |
Application Scenarios
The 3500/42 Speed Monitor is deployed in applications involving critical rotating machinery where reliable speed monitoring and protection are essential for operational safety.
Typical Application Scenarios:
Turbine Overspeed Protection:
Gas & Steam Turbines: Continuously monitoring the RPM of turbines and initiating an emergency shutdown if the speed exceeds predefined dangerous limits to prevent catastrophic failure.
Compressor and Pump Speed Monitoring:
Protecting high-value compressors and pumps by providing reliable speed monitoring and overspeed protection in pipeline, refining, and process applications.
Critical Machinery Protection:
Used on generators and other large rotating equipment where speed monitoring is essential for operational safety and asset protection.
Underspeed and Zero-Speed Detection:
Monitoring for low-speed conditions that could indicate drive coupling failure or other mechanical problems, and providing zero-speed confirmation for maintenance lockout procedures.
Industries of Use:
Power Generation (Gas, Steam, and Hydro Turbines)
Oil & Gas (Pipeline Compressors, Pumps)
Petrochemical & Refining
Marine Propulsion
The 3500/42 provides critical speed protection functions while integrating seamlessly with the broader 3500 machinery protection system for comprehensive asset monitoring.
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