Product Overview

The Bently Nevada 149369-01 is a high-performance Enhanced Keyphasor Module (3500/25) engineered to provide once-per-turn timing signals to a 3500 Machinery Protection System. This half-height, dual-channel module is essential for phase-locked data acquisition, allowing the system to determine shaft rotational speed and phase angle. By identifying the exact moment a timing mark on the shaft passes a transducer, the 149369-01 enables the calculation of critical diagnostic metrics such as 1X vibration amplitude and phase.

As an "Enhanced" version, this module offers improved signal processing over legacy Keyphasor units, ensuring high-fidelity digital pulse generation even in high-speed or electrically noisy environments. It acts as the timing backbone for the entire rack, distributing synchronized clock signals to vibration, position, and transition modules for precise machinery diagnostics and transient data capture.

Technical Characteristics

• Channel Density: Two independent channels capable of processing two separate Keyphasor signals.

• Input Compatibility: Supports signals from proximity probes, magnetic pickups, and active sensors.

• Signal Conversion: Transforms raw analog transducer pulses into precise digital timing signals.

• Rack Integration: Half-height design; occupies one-half of a standard slot in the 3500 rack.

• Speed Range: Supports a wide range of rotational speeds, from slow-roll to high-speed turbine applications.

• Input Impedance: High-impedance design (minimum 21.8 kΩ) to prevent signal loading.

• Power Efficiency: Low power consumption rated at 3.2 Watts.

• Environmental Tolerance: Operational in temperatures ranging from -30°C to +65°C.

• System Connectivity: Distributes Keyphasor data across the rack backplane for use by all monitor modules.

• Weight: 0.34 kg (0.76 lbs).

• Dimentions:15cm x 5cm x 3 cm
  

• Manufacturing Origin: USA.

System Utility and Application

The 149369-01 is indispensable for rotating machinery that requires phase-related vibration analysis, such as steam turbines, centrifugal compressors, and large motors. By providing the phase reference, it allows the 3500 system to distinguish between different types of mechanical faults, including shaft unbalance, misalignment, and structural resonance.

A key advantage of the Enhanced Keyphasor Module is its ability to support multiple modules in a single 3500 rack, allowing for redundant timing sources or the monitoring of multiple shafts within the same protection system. The module's robust hardware-based pulse detection ensures that even if one channel or sensor fails, the machinery protection path remains secure. With its "Plug-and-Play" compatibility with 3300 XL proximity sensors, the 149369-01 remains a standard component for modern predictive maintenance programs integrated with System 1 software.