The Bently Nevada 3500/25 135473-01 Keyphasor I/O Module is a rear-panel interface module designed specifically for use with the Enhanced Keyphasor Module (3500/25) in the Bently Nevada 3500 machinery protection system. The Keyphasor system plays a critical role in shaft phase reference generation, enabling diagnostic functions such as orbit plotting, Bode plots, and rotor balancing.

This particular model, 135473-01, is a non-isolated Keyphasor I/O module, engineered to condition and transmit the raw sensor input from proximity probes or magnetic pickups directly to the Keyphasor module. It ensures accurate transmission of TTL-compatible square wave signals without requiring galvanic isolation.

Though it lacks isolation, this I/O module is suitable for systems where electrical interference is minimal or where isolation is provided externally. It supports a clean, reliable interface between field sensors and monitoring logic, delivering real-time phase reference data essential to rotating machinery diagnostics.

Technical Specifications

Applications

The 135473-01 Keyphasor I/O Module is ideal for integration in systems where Keyphasor signals are used for:

• Turbomachinery Monitoring

  Delivers real-time shaft phase information for turbines and expanders used in energy and oil & gas applications.

• Compressor Systems

  Supports vibration phase correlation and diagnostic plotting for axial and centrifugal compressors.

• Generator Diagnostics

  Enables synchronization and phase-based analysis of electrical generators in power plants.

• Marine Engines

  Used in engine-driven propulsion or generation systems where phase reference is vital for balancing.

• Pumps and Industrial Fans

  Provides reliable reference signals for monitoring shaft alignment and dynamic behavior.

• Refineries and Petrochemical Facilities

  Supports condition-based monitoring and predictive maintenance strategies for critical rotating assets.

Product Advantages

• Direct Sensor Interface

  Accepts signals from proximity probes and magnetic pickups without additional converters.

• Efficient Signal Path

  Provides fast, clean signal transmission to the 3500/25 module for minimal processing delay.

• Compact Installation

  Installs neatly into the back of the 3500 rack, maintaining clean cabling and rack organization.

• Configurable Channels

  Supports one or two Keyphasor inputs, either for independent signal use or redundancy.

• High-Speed Performance

  Handles signal frequencies up to 20 kHz—ideal for high-speed turbine systems.

• Cost-Effective Design

  Non-isolated design reduces component count and cost where isolation is not essential.

• Durable Construction

  Designed to withstand industrial environments with extended temperature and humidity ranges.

• Low Maintenance

  Passive module requires no routine servicing, reducing operational overhead.

Frequently Asked Questions (FAQ)

1. What does the 135473-01 module do?

It connects Keyphasor input signals from probes or pickups to the Enhanced Keyphasor Module in the 3500 rack.

2. Is this an isolated I/O module?

No, the 135473-01 is a non-isolated module. For applications requiring electrical isolation, consider the 126648-02 model.

3. How many channels does it support?

It can support up to two channels, configurable for independent or redundant Keyphasor inputs.

4. Which sensors are compatible?

It works with Bently Nevada proximity probes (such as 3300 XL) and magnetic pickups.

5. Where is the module installed in the system?

It is mounted in the rear I/O slot of the 3500 rack, directly behind the 3500/25 module.

6. Does it require a power supply?

No, it is powered through the rack’s backplane and requires no external power connection.

7. Is this module suitable for high-speed turbines?

Yes, it supports signal frequencies up to 20 kHz, suitable for high-RPM rotating machines.

8. Can it be used in hazardous environments?

While the module itself is not rated for hazardous zones, it may be used in certified systems depending on rack setup.

9. How does this module differ from the 126648-02?

The 135473-01 lacks signal isolation, making it suitable only in low-noise environments or where isolation is external.

10. Is this module compatible with all 3500/25 versions?

Yes, it is compatible with all Enhanced Keyphasor Module configurations within the 3500 series.