Overview

The 3500/25 Enhanced Keyphasor® Module is a dual-channel, half-height module designed to generate precise Keyphasor® reference signals for machinery monitoring and protection systems within the Bently Nevada 3500 series.
It receives analog inputs from proximity probes or magnetic pickups and converts them into digital Keyphasor® signals, enabling accurate measurement of shaft rotational position, phase, and speed — essential for vibration analysis, phase tracking, and rotor diagnostics.

Electrical Parameters

Key Features

Dual-Channel Design:
Two independent channels enable simultaneous signal acquisition from multiple sensors, improving redundancy, accuracy, and signal processing efficiency.

Precise Keyphasor® Signal Processing:
Converts analog input signals into digital reference pulses to ensure accurate phase and rotational position data for machinery protection and diagnostics.

Scalable System Integration:
The 3500 system can accept up to four Keyphasor® inputs in a standard configuration and up to eight inputs in paired setups, accommodating complex or redundant monitoring requirements.

Backward Compatibility:
The enhanced module fully replaces the legacy PWA 125792-01 Keyphasor® module, maintaining the same form, fit, and function for easy retrofit into existing 3500 systems.

Embedded Switch Technology:
Integrated Ethernet switch supports 10/100 Mbps communication, allowing direct connection to downstream devices without external network switches.

Advanced Diagnostics and Troubleshooting:
A built-in network server enables users to access configuration settings, operational status, and diagnostic data through a standard web browser, providing tools for network performance monitoring and fault analysis.

Environmental Specifications

Applications

The 3500/25 Enhanced Keyphasor® Module is widely used in rotating machinery monitoring for industries such as power generation, oil and gas, petrochemical, and heavy manufacturing.
Common use cases include:

Shaft phase reference for vibration and balancing analysis

Turbine, compressor, and generator monitoring

Start-up and coast-down data collection

Condition-based maintenance and fault diagnostics