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The Bently Nevada 125800-01 is a specialized Keyphasor I/O module designed for use with the 3500/25 Enhanced Keyphasor Module. This unit features internal terminations and serves as the primary interface between field transducers, such as proximity probes or magnetic pickups, and the 3500 monitoring system. By processing raw pulses from rotating shafts, the module facilitates precise phase and speed measurements essential for comprehensive vibration analysis.

Features

  • Two-channel configuration for flexible monitoring.
  • Internal termination design for streamlined wiring.
  • Non-isolated I/O architecture suitable for systems where signal isolation from external control devices is not required.
  • Buffered transducer outputs for each channel, enabling the connection of external diagnostic or test equipment without interfering with the primary monitoring signal path.
  • Half-height module design to optimize space within the 3500 rack.

Applications

This module is engineered for critical machinery protection in industrial environments, including:

  • Turbine and generator monitoring for phase reference and speed tracking.
  • Centrifugal pump and motor vibration analysis.
  • Gearbox monitoring to detect friction or lubrication-related issues.
  • Industrial fan, blower, and extruder speed synchronization.

Technical Specifications

Model 125800-01
Type Keyphasor I/O Module (Internal Terminations)
Channels 2
Transducer Power Supply -24 Vdc, 40 mA max per channel
Operating Temperature 0 degC to +65 degC
Storage Temperature -40 degC to +85 degC
Humidity 95%, non-condensing

Installation Guidelines

  • Ensure the 3500 rack power is disconnected before installing or removing any module to prevent electrical damage.
  • Verify that you are working in a safe, non-hazardous environment.
  • Align the module carefully with the top and bottom guides of the designated rear rack slot.
  • Slide the module firmly into the slot until the rear connector fully engages with the system backplane.
  • Ensure all field wiring is securely connected to the internal terminal blocks according to the specific system wiring diagram.

FAQ

What is the primary function of the 125800-01?

The 125800-01 receives raw signals from proximity probes or magnetic pickups and converts them into digital Keyphasor signals for the 3500 monitoring system, providing the necessary timing reference for vibration and RPM measurement.

Does this module support external diagnostics?

Yes, the module provides separate buffered outputs for each channel, allowing you to connect portable test equipment or diagnostic tools without interrupting the signal being sent to the 3500 monitoring rack.

What is the operating temperature range?

The module is rated for operation between 0 degC and +65 degC (32 degF to +150 degF).

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