Description
Product Parameters
- Model Number: 3500/25
- Part Number: 125792-01
- Module Type: Enhanced Keyphasor Module
- Input Channels: 2-channel half-slot module (up to 4 channels per rack)
- Input Signal Type: Magnetic Pickups or Proximitor Transducers
- Output Signals: Buffered Transducer Outputs, Keyphasor Signals
- Isolation: 500 Vdc galvanic isolation
- Signal Range: 0.8 Hz to 20,000 Hz (depending on configuration)
- Threshold Adjustment: Automatic or Manual (Programmable)
- I/O Type: Keyphasor I/O Module with Internal Terminations
The 3500/25 125792-01 is a specialized half-slot module that provides phase reference signals to the 3500 rack by processing pulses from Keyphasor transducers. This enhanced version is capable of receiving input from a wide variety of sensors and converting them into precise digital timing signals used for machinery diagnostic calculations like vector analysis and filtered vibration tracking. By providing highly accurate speed and phase information, it enables the monitoring system to determine exactly when a vibration event occurs relative to the shaft rotation, which is critical for balancing and early fault detection in high-speed rotating equipment.
Comparison with Similar Models
The 3500/25 Enhanced Keyphasor module provides several technical upgrades over standard or older timing configurations:
- 3500/25 vs. 3500/25 (Legacy Version): The “Enhanced” 125792-01 version supports more advanced signal processing and has improved threshold tracking capabilities compared to earlier revisions. It is designed to handle more complex pulse shapes and offers better noise immunity for more reliable phase data in electrically noisy environments.
- 3500/25 vs. 3500/50 (Tachometer Module): While both modules measure speed, the 3500/25 is specifically optimized for phase reference (timing) rather than just totalizing RPM. The Keyphasor module provides a once-per-turn (or multiple-per-turn) pulse that synchronizes the vibration data of all other modules in the rack, whereas the 3500/50 is primarily for overspeed protection and speed indication.
- 125792-01 vs. 125792-02 (Isolated vs. Non-Isolated): The 125792-01 configuration is often specified for its specific I/O termination style. Unlike older versions that might require external signal conditioning, the 176449-style family (of which this I/O is a part) allows for direct interface with Bently Nevada transducers, simplifying the wiring and reducing the footprint within the 3500 system cabinet.
