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SKU: 133434-01

Bently Nevada 133434-01 3500/50 Tachometer I/O Module External Terminations

The Bently Nevada 133434-01 is a 2-channel Tachometer I/O Module with external terminations for the 3500/50 system. It accepts signals from proximity probes or magnetic pickups, providing reliable speed monitoring and acceleration data for critical machinery protection.

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Technical Function and System Interface

The Bently Nevada 133434-01 serves as the specialized I/O interface for the 3500/50 and 3500/50M Tachometer Modules within the 3500 Machinery Protection System. This module is installed in the rear of the 3500 rack, where it receives high-frequency pulse signals from speed sensors and routes them to the main processing card. Because this specific version utilizes external terminations, it connects to a separate External Termination (ET) Block via a multi-conductor cable. Consequently, this architecture allows for more flexible cabinet wiring and simplifies maintenance by moving the physical field-wiring points away from the high-density rear of the rack.

Core Technical Specifications

  • Brand: Bently Nevada 
  • Model Number: 133434-01
  • Module Type: Tachometer I/O Module with External Terminations
  • Compatible Main Monitor: Bently Nevada 3500/50 or 3500/50M
  • Channels: 2 independent speed/position channels
  • Input Range: +10.0 V to -24.0 V 
  • Input Compatibility: Proximity Probes or Magnetic Pickups (MPU)
  • Frequency Support: 0.0167 Hz to 20 kHz 
  • Operating Temperature: -30°C to +65°C 
  • Weight: 0.20 kg 
  • Rack Space: 1 full-height rear slot

Industrial Applications and Operational Benefits

Industrial operators utilize the 133434-01 module to facilitate high-accuracy speed monitoring and overspeed protection on critical rotating assets. The 3500/50 system provides real-time diagnostics that are essential for steam turbines, gas turbines, and large-scale centrifugal compressors. Furthermore, the module supports sophisticated monitoring modes including:

  • Rotor Speed and Peak Speed tracking
  • Zero-speed detection for safe machine turning/braking
  • Rotor acceleration monitoring for startup safety
  • Reverse rotation notification to prevent back-flow damage
  • Conditioned Keyphasor signal output for system-wide phase reference

Installation and External Termination

Technicians mount the 133434-01 directly behind the tachometer monitor module in the 3500 chassis. Since this is the external termination (ET) version, the module features a dedicated D-sub or multi-pin connector rather than integrated screw terminals. This allows the user to link the module to an ET block (such as part number 133442-01) using a pre-fabricated cable. Moreover, this setup effectively separates the high-frequency signal inputs from DC power and relay wiring, which minimizes electromagnetic interference (EMI) and ensures a high-integrity pulse stream for accurate RPM calculations.

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