Bently Nevada 3500/25 125792-01 Vibration transmitter sensor


Part number: 3500/25 125792-01
Manufacturer: Bently Nevada
Condition: Brand new original, factory packaged
Factory warranty: 12 months


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Part number: 3500/25 125792-01
Manufacturer: Bently Nevada
Series: 3500
Input signal: -10 Vdc to+10 Vdc
Power consumption: 7.7 watts
Axis power supply: -24 Vdc
Product type: Transient Data Interface Module
Temperature: 25 degrees Celsius
Sensor power supply: -24 Vdc
Weight 0.82 kg (1.8 lb.)
Dimensions 241 mm x 24.4 mm x 242 mm
(9.50 in x 0.96 in x 9.52 in)
Supply situation: In stock
Repair: 3-7 days
Country of origin: United States



Function Description:

The provided information describes the features and capabilities of the 3500/25 125792-01 Enhanced Keyphasor® Module, which is a component of the 3500 Monitoring System. Here’s a summary:


  • The 3500/25 125792-01 Enhanced Keyphasor Module is a half-height, 2-channel module.
  • It provides Keyphasor signals to the Monitor modules in a 3500 Rack.
  • Analog input signals from proximity probes or magnetic pickups are converted to conditioned digital signals indicating when the Keyphasor mark on the shaft aligns with the probe.
  • The 3500 Monitoring System can accept up to 4 Keyphasor signals, used to measure vector parameters such as 1X amplitude and phase.


  • A 3500 Rack may have 1 or 2 Keyphasor Main Modules in a normal configuration.
  • Paired Keyphasor configuration can have 3 or 4 Keyphasor Main Modules.
  • Five types of Keyphasor I/O Modules can be installed.

Enhanced Keyphasor Main Module:

  • An upgraded version of the original 3500/25 125792-01 Keyphasor Main Module.
  • Enhanced signal processing capabilities.
  • Fully compatible with the original Keyphasor Main Module and all Keyphasor I/O Modules for use in legacy systems.
  • Identical physical and mechanical characteristics as the original module.
  • Uses a digital signal processor (DSP) to expand on the original design.

Signal Processing:

  • The DSP generates an arbitrary number of output Keyphasor events in proportion to the input events.
  • Output rate is not limited to a small range of integral event ratios.
  • Independently programmable real-numbered ratio of input events to output events for each of the 2 signal channels.

Types of Keyphasor Signals:

  1. Processed Signals:
    • Signal undergoes a change in frequency from input transducer signal to output conditioned Keyphasor signal.
    • Only available from an Enhanced Keyphasor Module.
    • Available for certain configuration options.
  2. Non-Processed Signals:
    • Signal does not undergo a change in frequency from input transducer signal to output conditioned Keyphasor signal.
    • The original Keyphasor Module design produced this type of signal.

Signal Selection:

  • Two types of Keyphasor signals (Processed and Non-Processed) are available on a per-channel basis.
  • Signals can be selected individually for routing to Monitor modules in a 3500 Rack and to buffered outputs.


  • Throughout the manual, the term “Keyphasor Module” refers interchangeably to both the original and Enhanced Keyphasor Main Modules.
  • Physical and mechanical characteristics are identical, and the interface to the 3500 Rack remains unchanged.

The Enhanced Keyphasor Module provides advanced signal processing capabilities, offering flexibility in configuring Keyphasor signals for various monitoring and diagnostic purposes within the 3500 Monitoring System.

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