Product Description

Overview

The Bently Nevada 125800-01 is a Keyphasor® Input/Output module with Internal Terminations, engineered for the 3500/25 Enhanced Keyphasor System. Installed in the rear of a 3500 rack, this module captures once-per-turn signals from rotating shafts and distributes precise timing and phase reference signals to monitor modules for accurate vibration and speed analysis.

This half-height module provides a direct interface for Keyphasor sensors, enabling high-speed machinery monitoring without requiring external terminal strips. It is compatible with both magnetic pickups and Proximitor® transducers, making it suitable for a broad range of turbine, compressor, and generator applications.

Key Features and Advantages

High-Precision Timing

• Captures trigger events with microsecond accuracy

• Ensures reliable phase measurements and 1X vibration amplitude calculations

• Essential for accurate RPM and phase reference in machinery protection

Dual-Channel Capability

• Supports two independent Keyphasor inputs per module

• Enables redundancy (primary and backup sensors) or multi-shaft monitoring

• Integrates seamlessly with the 3500/25 monitor module

Enhanced Signal Processing

• Handles both passive magnetic pickups and active Proximitor® sensors

• Isolated inputs reduce electrical noise and prevent ground loops

• Supports Enhanced Keyphasor functionality to distribute signals to multiple rack modules

Operational Reliability

• Hot-swappable for maintenance without powering down the rack

• Supports self-diagnostics to verify transducer and wiring health

• Fully backward compatible with existing Keyphasor modules for easy upgrades

Technical Specifications

Applications

• Turbine and generator shaft speed and phase monitoring

• High-speed rotating machinery vibration analysis

• Redundant signal input configurations for critical systems

• Multi-module Keyphasor signal distribution within 3500 racks

FAQ

Q: What is the primary function of the 125800-01?
A: It captures once-per-turn Keyphasor signals and provides timing and phase reference to 3500 monitor modules.

Q: How many channels does the module support?
A: Two independent Keyphasor input channels per module.

Q: Can this module be replaced without shutting down the rack?
A: Yes, it is hot-swappable for continuous system operation.

Q: What is the difference between internal and external termination modules?
A: Internal termination modules, like 125800-01, connect wiring directly to the module terminals. External termination modules, like 126648-01, use a separate DIN rail or terminal strip.

Q: Which sensors are supported?
A: Proximitor® transducers and magnetic pickups.