BENTLY 133811-01

Description

Product Description

The BENTLY 133811-01 is a specialized keyphasor signal conditioning module within the Bently Nevada (Baker Hughes) 3500 series machinery monitoring system. This module is designed to process the raw signal from a Keyphasor® transducer, typically an eddy current proximity probe, to generate a clean, once-per-revolution timing pulse and a corresponding speed signal. The BENTLY 133811-01 serves as a critical input for other 3500 series monitor modules, providing the essential rotational reference needed for vibration phase analysis, speed measurement, and synchronous data capture. For comprehensive technical specifications, installation instructions, and application guides, the essential resource is the official Baker Hughes Bently Nevada documentation portal for the BENTLY 133811-01. The accurate operation of the 133811-01 is fundamental to advanced diagnostic capabilities, as it allows vibration events to be correlated to a specific point on a rotating shaft. Its role in enabling predictive maintenance and detailed fault analysis makes it a key component in protecting high-value turbomachinery.

Product Parameters

• Manufacturer / Brand: Bently Nevada (Baker Hughes).
• Series: 3500 Machinery Monitoring System.
• Model / Part Number: 133811-01 (Keyphasor Module / Conditioner).
• Function: Keyphasor Signal Conditioner and Speed Input Module.
• Input Signal: Accepts the raw signal from a Keyphasor transducer (typically a -2 to -18 VDC gap voltage from an eddy current probe observing a keyway or notch on a shaft).
• Signal Conditioning: Filters, amplifies, and shapes the input signal to produce a clean, digital-quality pulse at each shaft revolution.
• Outputs: Provides:
  • A conditioned Keyphasor pulse output for other 3500 monitor modules (e.g., vibration monitors).
  • A speed output signal (typically a scaled analog voltage or frequency proportional to RPM).
• Configuration: Configurable via the 3500/92 Communication Module and software for parameters such as trigger level, pulse width, and speed scaling.
• Diagnostics: Includes module health monitoring and diagnostics for input signal faults (e.g., loss of signal).
• Power: Powered from the 3500 system backplane.
• Form Factor: A single-slot monitor module designed for installation in a 3500 series rack.

Advantages and Features

• Essential for Phase Analysis: Provides the critical timing reference that allows vibration analysts to determine the phase relationship of vibration vectors, which is vital for diagnosing imbalance, misalignment, and other rotor dynamic faults.
• Accurate Speed Measurement: Delivers a reliable and precise speed signal for machinery protection, overspeed detection, and performance monitoring.
• Advanced Signal Conditioning: Built-in filtering and adjustable trigger levels ensure a reliable pulse is generated even from marginal or noisy transducer signals, improving system robustness.
• Integrated System Component: Fully integrates into the 3500 system framework, allowing centralized configuration, alarming, and data communication.
• Enhanced Diagnostic Capability: By enabling phase data, the BENTLY 133811-01 transforms a basic protection system into a powerful diagnostic tool for predictive maintenance.

Application Cases in Industry

• Gas Turbine Condition Monitoring: The BENTLY 133811-01 conditions the Keyphasor signal from a probe observing a notch on the turbine shaft, enabling phase analysis of vibration data to distinguish between imbalance, aerodynamic forces, and other faults.
• Steam Turbine/Generator Sets: Provides the speed and timing reference for monitoring synchronous vibration on large turbine-generators, crucial for stability analysis and avoiding critical speeds.
• Centrifugal Compressor String Analysis: Used on multi-stage compressors to allow analysts to observe vibration phase changes across bearing points, aiding in diagnosing rotor bow or internal rubs.
• Critical Pump and Fan Monitoring: On large, variable-speed pumps or fans, the module provides accurate speed feedback and enables order tracking analysis to separate speed-related vibration from other components.
• Hydroelectric Unit Monitoring: Provides the once-per-rev pulse for precise analysis of generator vibration and runaway speed detection.

Comparison with Competing Products

Competing products are keyphasor or speed input modules from other machinery monitoring system vendors, such as EPRO (MMS 6000 series tachometer modules) or Schenck (Vibrocontrol 4000 tacho modules). The BENTLY 133811-01 differentiates itself through its deep integration into the industry-standard Bently Nevada 3500 platform. Compared to a simple frequency-to-analog converter, the 133811-01 is a sophisticated conditioner designed specifically for the electrical characteristics of proximity probes and the complex needs of rotor dynamics analysis. Its primary advantage is its seamless operation within the comprehensive 3500 environment, which includes dedicated vibration, position, and temperature monitors that all utilize the Keyphasor reference it provides.

Selection Suggestions and Precautions

• Selection Suggestions:
  1. Select the BENTLY 133811-01 when a Keyphasor reference and/or a conditioned speed signal is required within a Bently Nevada 3500 monitoring system for protection or diagnostic purposes.
  2. Ensure compatibility with the type of transducer being used (typically a standard Bently Nevada proximity probe with a -2 to -18V DC output range).
  3. Plan for integration by ensuring a rack slot is available and that the 3500 rack is configured with a necessary power supply and communication module.
• Precautions:
  1. Transducer Installation: The Keyphasor probe must be installed correctly, observing a clean, sharp-edged keyway or notch on the shaft. Poor target quality will result in an unreliable signal.
  2. Signal Wiring: Use proper double-shielded coaxial cable for the transducer connection. Follow Bently Nevada’s strict grounding guidelines—typically grounding the shield at the rack end only—to prevent signal contamination.
  3. Configuration is Critical: The module’s trigger level and filtering must be correctly configured in the 3500 software to reliably detect the notch without false triggering on noise or shaft runout. Incorrect settings will cause missed or extra pulses.
  4. Redundancy Consideration: For critical machinery, consider using a redundant Keyphasor source (two probes and potentially a second 133811-01 module) to ensure the reference signal is always available.
  5. Genuine Parts and Software: Source the BENTLY 133811-01 from authorized Baker Hughes distributors. Configuration requires the official 3500 Configuration Software. The use of non-genuine parts or incorrect configuration can compromise the entire monitoring system’s diagnostic accuracy and reliability. Always verify the Keyphasor signal quality on an oscilloscope during commissioning.

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