Bently Nevada 3500/25 126648-02 Isolated Keyphasor I/O Module

The Bently Nevada 3500/25 126648-02 Isolated Keyphasor I/O Module is a specialized component of the Bently Nevada 3500 Machinery Protection System. Designed to work in tandem with the 3500/25 Enhanced Keyphasor Module, this I/O card provides galvanic isolation for Keyphasor signals, enhancing the integrity of signal transmission and protecting the system against electrical disturbances.

The purpose of this isolated module is to receive input signals from proximity probes or magnetic pickups, condition those signals, and output them as clean, TTL-compatible square wave pulses. These pulses serve as a precise rotational phase reference for dynamic machinery analysis. The galvanic isolation ensures that transients or ground loop noise in the sensor wiring do not affect the integrity of data within the 3500 rack system.

With robust design and enhanced electrical insulation, the 126648-02 I/O module is essential in high-noise industrial environments and is ideal for applications involving turbines, compressors, and other critical rotating machinery.

Technical Specifications

Applications

The 126648-02 Isolated Keyphasor I/O Module is widely used in industrial monitoring systems where signal integrity and safety are paramount. Its main application areas include:

• Steam and Gas Turbines

  Ensures clean phase reference for dynamic balancing, vibration phase detection, and rotor tracking.

• Compressors

  Protects the Keyphasor signal path from electrical noise often found in oil & gas compressor systems.

• Power Generation Equipment

  Provides critical phase data for condition-based monitoring of generators and turbines.

• Petrochemical Processing Plants

  Isolates signals in hazardous environments where electrical transients are common.

• High-speed Rotating Machinery

  Suitable for any system requiring accurate rotational timing and phase references at high speeds.

• Marine and Offshore Systems

  Used in propulsion and auxiliary systems to enable predictive maintenance and phase-based diagnostics.

Product Advantages

• Signal Integrity Protection

  Galvanic isolation prevents noise, voltage spikes, and ground loops from corrupting phase signals.

• Seamless Integration

  Designed specifically for use with the 3500/25 Enhanced Keyphasor Module and fits directly in the rack system.

• Dual Channel Capability

  Supports redundant or dual Keyphasor signal setups for reliability and flexibility.

• Rugged Industrial Build

  Withstands high EMI environments and operates in wide temperature/humidity ranges.

• Improved Diagnostics

  Delivers clean signals for improved accuracy in Bode plots, orbits, and phase analysis.

• Safe for Hazardous Areas

  Certified for use in ATEX/IECEx environments where isolation is a safety requirement.

• Compact Form Factor

  Minimal footprint makes it ideal for tight control cabinets or dense instrumentation racks.

• Low Maintenance

  Passive design with no moving parts ensures long-term reliability without routine servicing.

Frequently Asked Questions (FAQ)

1. What is the function of the 126648-02 I/O module in the 3500 system?

It isolates and conditions Keyphasor input signals before they reach the processing module, ensuring signal integrity.

2. Is this module mandatory for all 3500/25 installations?

Yes, it is required for the Enhanced Keyphasor Module to function, especially in isolated or redundant setups.

3. What type of signal inputs can it handle?

It can accept signals from proximity probes or magnetic pickups that produce TTL or pulse-type outputs.

4. Can it support two Keyphasor inputs at the same time?

Yes, it is designed to support dual channels for applications requiring redundancy or two independent Keyphasor signals.

5. How does the isolation improve performance?

It protects the Keyphasor module from electrical noise, voltage surges, and ground potential differences.

6. Does it require external power?

No, it draws all required power from the 3500 rack backplane.

7. Where is it installed?

It is mounted at the rear of the rack directly behind the 3500/25 Enhanced Keyphasor Module.

8. What certifications does it have?

It is certified for CE, UL, ATEX, and RoHS, making it suitable for global industrial applications.

9. What happens if the I/O module fails?

Signal loss will occur, and the system will report a fault. Redundancy in dual-channel setups can mitigate this.

10. Is it suitable for high-speed equipment?

Yes, it supports signal frequencies up to 20 kHz, ideal for high-speed rotating equipment.