High-Performance Keyphasor Module for Rotating Machinery Monitoring

The Bently Nevada 3500/25-03-01-01 Enhanced Keyphasor Module is a half-height, two-channel module used within the 3500 Machinery Protection System to provide precise Keyphasor® (once-per-turn or multiple-event-per-turn) reference signals for shaft rotational speed, phase angle, and vector measurements. The module accepts input signals from proximity probes or magnetic pickups and converts them into digital Keyphasor signals for use by other 3500 monitoring modules and external diagnostic equipment.

Technical Specifications

Frequently Asked Questions

1. What is a Keyphasor signal?

A Keyphasor signal is a once-per-turn or multiple-event-per-turn pulse generated from a shaft or gear reference mark, providing an accurate timing reference for vibration and speed measurements.

2. How many channels does the module support?

The module provides two independent input channels.

3. Can it accept magnetic pickups?

Yes. Depending on the selected I/O module configuration, it supports both proximity probes and magnetic pickups.

4. What does the "-03" option indicate?

It specifies an Internal Barrier I/O Module with Internal Terminations.

5. Is it backward compatible with older Keyphasor modules?

Yes. The Enhanced Keyphasor Module is designed as a direct functional replacement for previous 3500 Keyphasor modules while adding expanded signal-processing capabilities.

6. What approval does the "-01" suffix represent?

The final 01 indicates CSA/NRTL Class I, Division 2 hazardous-area approval.

7. How many Keyphasor signals can a 3500 system support?

A standard configuration supports up to four Keyphasor signals, while a paired configuration supports up to eight.

8. Which machinery commonly uses this module?

It is widely used on turbines, compressors, generators, motors, pumps, and other critical rotating equipment requiring precise shaft speed and phase reference measurements.