Bently Nevada 3500/25-01-02-00 (126648-01)

Bently Nevada 3500/25-01-02-00 (126648-01)

Product Overview: The 3500/25 is a half-height keyphasor module that provides power and signal conditioning for up to two keyphasor sensors. The 126648-01 is the I/O module with external terminal connections. The part number 3500/25-01-02-00 indicates one keyphasor channel with external terminals. This module generates the keyphasor reference signal used for phase measurement, speed calculation, and synchronous vibration analysis throughout the 3500 system.

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Description

Bently Nevada 3500/25-01-02-00 (126648-01)

Technical Specifications:

  • Product Series: 3500 Keyphasor Module
  • Module Type: Half-height Keyphasor Module
  • Channel Count: Supports up to 2 keyphasor sensor inputs per module
  • Part Number: 126648-01 (I/O module with external terminals)
  • Configuration: 01 = One keyphasor channel, 02 = External terminals

Functional Features:

  • Provides DC power to keyphasor proximity probes
  • Conditions the keyphasor pulse signal for distribution to other modules via the backplane
  • Supports up to 4 keyphasor sensors per rack (2 modules × 2 channels each)
  • When two 3500/25 modules are used, they must be installed in the same slot (upper and lower)
  • Keyphasor signal is distributed through the backplane to vibration monitors for phase and speed calculations

Application Scenarios:

  • Phase reference for vibration analysis on steam turbines and gas turbines
  • Speed measurement and overspeed detection
  • Synchronous filtered vibration (1×, 2× tracking)
  • Rotor balancing operations requiring phase reference
  • Any rotating machinery requiring keyphasor-based monitoring

Performance Parameters:

  • Sensor Input: Proximity probe signals from 3300 XL series or compatible sensors
  • Output: Keyphasor pulse signal distributed via backplane
  • Maximum Modules per Rack: 2 (supporting up to 4 keyphasor channels total)

Material Composition:

  • Industrial-grade PCB
  • External terminal block connectors for field wiring

Structural Features:

  • Half-height module form factor
  • Front module connects to backplane; rear I/O module (126648-01) provides external terminal connections
  • Compact design allows two modules to share one full-height slot

Working Principle: The keyphasor module powers the keyphasor proximity probe, which detects a once-per-revolution pulse from a keyway or notch on the shaft. The module conditions this pulse into a clean digital signal and distributes it through the 3500 backplane to all other monitor modules. These modules use the keyphasor signal to determine shaft phase angle, calculate rotational speed, and perform synchronous vibration filtering.

Installation Requirements:

  • Install in any available slot to the right of the rack interface module
  • If using two 3500/25 modules, install them in the same slot (upper and lower positions)
  • Connect keyphasor probe cables to the external terminal blocks
  • Ensure the keyphasor probe is properly aligned with the shaft keyway or notch

Usage Precautions:

  • The keyphasor signal is critical for phase-based measurements; verify signal integrity after installation
  • Do not exceed the maximum of 4 keyphasor channels per rack
  • Ensure proper probe gap setting on the keyphasor sensor
  • Verify that the keyphasor pulse is clean and free of noise before enabling phase-based monitoring

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