The Bently Nevada 135473-01 3500/25 Isolated Keyphasor I/O Module is designed for precision signal isolation and reliable Keyphasor signal processing in critical rotating machinery applications. Engineered with internal barriers and internal terminations, this I/O module offers a complete and robust solution for capturing once-per-turn signals from shaft rotation.

This module is ideal for setups where Keyphasor signals are shared across multiple devices and must remain isolated from other systems such as control or safety systems. Originally developed for magnetic pickup applications, it also supports Proximitor® systems when used with an external power supply.

Although primarily intended for shaft speed monitoring, the module can provide phase measurements—with a slightly higher phase shift compared to non-isolated versions. Additionally, it supports advanced capabilities like once-per-turn signal generation from multi-event inputs, field-upgradeable firmware, and asset management data reporting for improved system insights.

Key Features:

• Internal barriers and internal terminations for simplified wiring

• Provides electrical isolation for parallel-connected Keyphasor signals

• Compatible with magnetic pickups and Proximitor® applications (with external power)

• Supports once-per-turn event signal generation

• Field-upgradeable firmware for future enhancements

• Asset management data output for improved diagnostics

Technical Specifications:

• Model Number: 135473-01

• System Compatibility: Bently Nevada 3500/25 Keyphasor Module

• Application: Shaft speed and limited phase monitoring

• Signal Type: Isolated Keyphasor input

• Phase Shift: Slightly higher than Non-Isolated version (varies with machine speed)

• Isolation Use Case: Ideal for sharing Keyphasor with multiple systems

Applications:

• Rotating machinery in oil & gas, petrochemical, and power generation

• Machines requiring isolated signal sharing across protection and control systems

• Systems with magnetic pickups or Proximitor-based speed monitoring

Benefits:

• Ensures safe and clean signal isolation between devices

• Reduces interference and risk of signal corruption

• Simplifies integration with multiple monitoring or control systems

• Delivers accurate speed measurements in real-time

• Enhances maintainability with field-upgradeable features