BENTLY 3500/42 140471-01

Description

Product Description

The BENTLY 3500/42 140471-01 is a specific hardware revision of a 2-channel Speed and Phase Monitor module for the Bently Nevada 3500 Machinery Protection System. This critical module is designed to provide reliable overspeed protection, precise speed measurement, and phase reference (Keyphasor®) information for rotating equipment such as turbines, compressors, and large pumps. The 3500/42 140471-01 processes signals from magnetic pickups (MPUs) or proximity probes to determine shaft speed and generate a once-per-revolution pulse essential for vibration analysis and balancing. The accurate data from the BENTLY 3500/42 140471-01 is fundamental for both machine protection and condition monitoring diagnostics.

Technical Parameters

• Device Type: 2-Channel Speed and Phase Monitor Module (Specific Revision 140471-01).
• Manufacturer: Bently Nevada (a Baker Hughes business).
• Compatible System: Bently Nevada 3500 Series Rack.
• Input Channels: 2 independent channels, each configurable for a speed input (from MPU or probe) and an optional second input for a second speed source or validation.
• Speed Measurement Range: Typically from 1 RPM to over 99,999 RPM with high accuracy.
• Keyphasor Function: Generates a clean, timed pulse output for each revolution used as a phase reference for vibration analyzers.
• Programmable Setpoints: Multiple adjustable setpoints per channel for Alarm and Danger conditions based on speed (overspeed, underspeed) and rate-of-change (acceleration/deceleration).
• Diagnostics: Continuous monitoring of input signal integrity (e.g., loss of signal, incorrect pulse count).
• Outputs: Includes relay outputs for setpoint trips, analog output (4-20 mA proportional to speed), and buffered sensor signals.
• Configuration: Configured via the 3500 System software; the revision 140471-01 indicates specific firmware and hardware component details.

Advantages and Features

• Critical Overspeed Protection: The primary role of the 3500/42 140471-01 is to provide failsafe overspeed protection, a vital safety function to prevent catastrophic turbine or compressor failure.
• Essential for Vibration Analysis: By providing a precise Keyphasor signal, this module enables synchronous vibration analysis (order tracking), which is crucial for diagnosing unbalance, misalignment, and other mechanical faults.
• High Reliability and Redundancy: Designed for continuous operation in critical applications. The two-channel design allows for redundancy or voting logic (e.g., 2-out-of-3) in safety systems, enhancing overall reliability.
• Advanced Diagnostics: The module continuously performs self-diagnostics and monitors the health of the connected speed sensors, providing early warning of potential issues before a protective function is compromised.
• Seamless System Integration: As a native component of the 3500 system, the BENTLY 3500/42 140471-01 integrates perfectly, sharing power, communication, and providing unified diagnostics and event recording within the framework.

Application Cases in Various Fields

• Gas & Steam Turbines (Power Generation): Primary and backup overspeed protection, speed control during startup/shutdown, and providing Keyphasor for vibration monitoring on bearings.
• Centrifugal Compressors (Oil & Gas): Overspeed trip protection and monitoring compressor shaft speed for anti-surge control systems and performance calculations.
• Hydro Turbines: Speed measurement and protection for governors and synchronization systems.
• Large Motors & Fans: Monitoring running speed and providing trip protection for critical driven equipment in mining and heavy industry.
• Turbo-expanders & Gearboxes: Speed monitoring for high-speed rotational equipment in process plants.

Comparison with Competing Products

The BENTLY 3500/42 140471-01 competes with speed monitoring modules in other machinery protection systems like Emerson (CSI) 6500 ATG and Schenck VIBROTIP. Its key competitive advantages are:

• Industry Standard for Critical Machinery: The Bently Nevada 3500 system is the de facto global standard for high-criticality turbomachinery protection. Choosing the 3500/42 140471-01 ensures compliance with many internal and insurance-related specifications.
• Unmatched Ecosystem Integration: It works natively with the full suite of 3500 vibration, position, and temperature modules, and with analysis software like System 1™, providing a unified, powerful diagnostic platform.
• Proven Safety and Certification: The system’s architecture and modules are designed and often certified for use in Safety Instrumented Systems (SIS) with defined Safety Integrity Levels (SIL), which is a key differentiator.

Selection Suggestions and Precautions

1. Verify Exact Part Number Compatibility: The revision (140471-01) is critical. Ensure this exact part number is specified for replacement or new systems to guarantee compatibility with the existing rack, firmware, and configuration.
2. Proper Sensor Selection and Installation: The module’s accuracy depends on correct MPU or probe selection (gap voltage, material), proper installation gap, and secure mounting. A faulty sensor signal will lead to faulty speed readings or trips.
3. Careful Configuration of Setpoints and Delays: Overspeed setpoints must be configured below the mechanical trip setting of the machine with appropriate time delays to avoid nuisance trips from electrical noise or transient spikes. This requires detailed knowledge of the machine’s specifications.
4. Implement Redundancy for Critical Functions: For maximum availability and safety, consider using multiple speed sensors wired to separate 3500/42 140471-01 channels or modules configured with voting logic (e.g., 2oo3).
5. Regular Functional Testing: The overspeed protection function must be tested regularly as per operational and safety standards. This often involves simulating a speed signal or using a manufacturer-approved test method to verify the BENTLY 3500/42 140471-01 and its associated trip relays operate correctly.

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