Bently Nevada 3500/25-02-03-01 135473-01 Keyphasor Input/Output Module

Product Specification

3500/25-02-03-01 135473-01 Keyphasor Input/Output Module

Brand Name:Bently Nevada

Product Name:3500/25-02-03-01 135473-01

Warranty:1Year

Key Parameters 

Core Features & Advantages

• Internal Isolation Design: The module's standout feature is its internal barrier and isolation architecture. This effectively prevents electrical noise and ground loop interference from the Keyphasor signal source from affecting the 3500 system or other connected control systems. For applications where Keyphasor signals must be shared across multiple devices, the 135473-01 provides a safe and reliable interface that avoids cross-system interference .

• Enhanced Compatibility: While designed primarily for magnetic pickup applications, the isolated I/O module is also compatible with Bently Nevada Proximitor® sensors when an external power supply is provided. This flexibility ensures broad applicability across various sensor configurations and reduces system integration complexity .

• Precise Phase and Speed Reference: The module delivers highly accurate speed and phase measurements, which are the foundation for vibration analysis (such as 1X amplitude and phase) and fault diagnostics. Precise Keyphasor signals enable 3500 monitor modules to detect abnormalities like imbalance and misalignment in a timely manner, facilitating effective predictive maintenance .

• Important Operational Note: The isolated I/O module's primary goal is to measure shaft speed rather than phase. While the module can provide phase measurements, the isolated version introduces a somewhat larger phase shift compared to the Non-Isolated I/O version. For applications where precise phase measurement is critical, the non-isolated version may be more appropriate .

Typical Applications

The 135473-01 is widely used across industries requiring precise monitoring and protection of rotating machinery :

• Oil & Gas: Monitoring turbines, compressors, pumps, and generators on onshore and offshore platforms

• Power Generation: Steam turbine phase tracking and overspeed protection

• Petrochemical: Centrifugal compressor surge boundary monitoring

• General Industry: Any application where Keyphasor signal isolation is required to prevent interference with control systems

Frequently Asked Questions (FAQ)

Q1: What is the primary function of the 135473-01?
A: It is a Keyphasor I/O module with internal isolation for the 3500/25 Enhanced Keyphasor Module. Its role is to receive signals from Keyphasor transducers (proximity probes or magnetic pickups) and convert them into isolated digital Keyphasor signals for speed and phase reference .

Q2: When should I use the Isolated version instead of the Non-Isolated version?
A: The Isolated I/O module is intended for use in situations where many devices are connected to Keyphasor signals simultaneously and where isolation from other systems (such as a control system) is necessary. It prevents electrical interference between the Keyphasor signal source and other connected equipment .

Q3: What is the phase measurement limitation of this isolated module?
A: The isolated I/O module's primary goal is to measure shaft speed rather than phase. While it can provide phase measurements, it introduces a somewhat larger phase shift compared to the Non-Isolated I/O version. For applications requiring highly precise phase measurement, consider the non-isolated version .

Q4: Can the 135473-01 work with Proximitor sensors?
A: Yes. Although designed primarily for magnetic pickup applications, the isolated I/O module is compatible with Proximitor® applications as long as an external power supply is provided. It will provide isolation for these applications .

Q5: How many Keyphasor channels does this module support?
A: The 135473-01 supports 2 Keyphasor input channels and 2 Keyphasor output channels . A standard 3500 rack configuration can accept up to four Keyphasor signals, expandable to eight in paired configurations .

Q6: Is the module hot-swappable?
A: The search results do not explicitly confirm hot-swap capability for the 135473-01. It is recommended to consult the 3500 system manual or contact Bently Nevada for specific maintenance procedures.

Recommended Models & Related Products

The 135473-01 is part of the Bently Nevada 3500/25 Keyphasor module family. Below are related models for different termination and isolation configurations :

Choosing the Right Model

• For isolation with internal terminations: The 135473-01 is the correct choice when you need galvanic isolation and prefer internal barrier connections .

• For standard non-isolated applications: The 125800-01 (internal terminations) or 126648-01 (external terminations) provides the same basic functionality without isolation .

• For isolation with external terminations: Consider the 126648-02 if your installation requires external termination blocks .