BENTLY 131151-01

Description

Product Description

The BENTLY 131151-01 is a specialized signal conditioning and driver module for the Bently Nevada 3500 system, specifically identified as a 3500/25 Keyphasor Module. This module is a fundamental component for the timing and phase reference of rotating machinery. Its primary function is to condition the raw signal from a Keyphasor transducer—typically an eddy current proximity probe observing a once-per-revolution mark on a shaft—and convert it into a clean, digital timing pulse. This Keyphasor pulse is then distributed to other monitoring modules within the 3500 rack, such as vibration monitors, to provide a phase-locked reference. This enables critical measurements like phase angle for balancing, order tracking for resonance analysis, and synchronous time-averaging for noise reduction in vibration data. The reliable operation of the Bently Nevada 131151-01 is essential for accurate diagnostic measurements and for certain protection algorithms on turbines, compressors, and other large rotating equipment.

Product Parameters

• Module Type: Keyphasor Signal Conditioner / Timing Module

• Compatible System: Bently Nevada 3500 Rack System

• Primary Function: Conditions the Keyphasor transducer signal and generates a phase-reference pulse for the monitoring system.

• Input Signal: Accepts signal from an eddy current proximity probe (or other Keyphasor sensor) observing a once-per-revoltion event (keyway, notch, tooth).

• Signal Conditioning: Includes adjustable trigger level (threshold), filtering, and hysteresis to generate a clean, jitter-free pulse even from noisy or varying amplitude signals.

• Output Signal: Provides a digital TTL-compatible pulse (Keyphasor pulse) to the 3500 rack backplane for use by other modules.

• Pulse Characteristics: Fixed width and voltage level suitable for the 3500 system’s internal timing bus.

• Status Indicators: LEDs for Power, OK, and often an LED that flashes with the Keyphasor pulse.

• Configuration: Programmable via the 3500 Configuration Software for trigger level and filtering settings.

• Mounting: Occupies a single slot in a 3500 system rack.

• Operating Temperature: 0°C to +65°C.

Advantages and Features

• Critical for Advanced Diagnostics: The BENTLY 131151-01 is indispensable for any vibration analysis requiring phase data, such as determining unbalance direction, identifying cracked shafts, or performing operational deflection shape analysis.

• High Signal Integrity: Advanced conditioning circuits ensure a reliable, noise-immune timing pulse is generated even if the raw transducer signal is degraded due to dirt, minor surface defects, or electrical interference.

• System-Wide Synchronization: A single 131151-01 module can provide the Keyphasor pulse to all other monitoring modules in the rack (e.g., 3500/42M, 3500/45), ensuring all vibration and position measurements are perfectly synchronized to shaft rotation.

• Configuration Flexibility: Adjustable trigger levels allow it to work reliably with different Keyphasor mark geometries and probe gaps, accommodating various machine designs.

• Proven Reliability: As a core component of the 3500 protection system, it is engineered for continuous, fail-safe operation in the critical timing path of machinery monitoring.

Application Cases in Various Fields

• Gas & Steam Turbine Balancing: The Bently Nevada 131151-01 provides the essential phase reference during startup and operation to determine the location and amount of balance weight required on turbine rotors.

• Compressor Train Monitoring: In a string of compressors driven by a single motor or turbine, a Keyphasor pulse from the 131151-01 on the high-speed shaft enables order-tracking analysis to diagnose issues like blade-pass frequency or gear mesh problems.

• Hydroelectric Unit Alignment: Used to measure the phase relationship between vibration points on a large hydroturbine generator, aiding in the detection of misalignment or stator/rotor interactions.

• Critical Pump and Fan Trains: Provides timing data to distinguish between running speed vibration and other forcing frequencies, enabling more precise fault diagnosis on induced draft fans or boiler feed pumps.

Comparisons with Competing Products

1. Integrated vs. Dedicated Timing: Some competing monitoring systems (e.g., from other vendors) integrate Keyphasor conditioning into their main vibration monitor cards. The advantage of the dedicated BENTLY 131151-01 is that it provides a centralized, high-quality timing source for the entire rack, freeing up processing power on individual monitors and ensuring consistency.

2. System-Centric vs. External Analyzers: Compared to using the Keyphasor input on a portable vibration analyzer, the 131151-01 provides a permanent, calibrated, and continuously available timing signal integrated directly into the online protection and condition monitoring system.

3. Performance and Reliability: Generic pulse conditioners or PLC high-speed counters lack the specialized filtering, adjustable hysteresis, and seamless integration with vibration data acquisition that the 131151-01 offers as part of a certified machinery protection system.

Selection Suggestions and Precautions

1. One Per Shaft Line: Typically, only one BENTLY 131151-01 module is required per independent rotor (shaft line) being monitored. It is a system-level resource, not a per-probe module.

2. Proper Transducer Selection and Installation: The performance of the 131151-01 is entirely dependent on a clean, reliable signal from the Keyphasor probe. Ensure the probe is correctly installed, the keyway or mark is well-defined, and the signal meets minimum amplitude requirements.

3. Critical Configuration: The trigger level setting in the configuration software is crucial. It must be set between the peak voltage of the Keyphasor “blip” and the baseline vibration signal to avoid double-pulsing or missed pulses. Incorrect setup will render all phase data useless.

4. Verify Pulse with LED: During commissioning and troubleshooting, use the module’s pulse indicator LED to visually confirm it is firing once per revolution. This is a basic but vital health check.

5. Redundancy Consideration: For machines where phase-related protection or diagnostics are critical, some sites install a redundant Keyphasor probe and a second 131151-01 module configured on a separate channel. The primary module’s failure would not completely disable phase-based monitoring.

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