Description
Bently 3500 25
Technical Specifications
- Model Number: 3500/25
- Module Type: Keyphasor Monitor
- Input Type: Proximity Probe (Eddy Current)
- Channels: 2 Independent Channels per Module
Key Features
- High-Speed Pulse Processing: Accurately captures shaft speed and phase angle even during rapid acceleration or deceleration.
- Signal Conditioning: Includes internal filtering to reject noise and false triggers from gear tooth harmonics.
- Tachometer Output: Generates buffered pulse outputs for external tachometers or PLCs.
Application Scenarios
Essential for any 3500 system monitoring steam turbines, gas turbines, or compressors where rotor balancing, orbit analysis, and synchronous vibration tracking are required.
Performance Parameters
- Frequency Range: 6 Hz to 120 Hz (Standard), up to 8 kHz with extended options
- Phase Accuracy: Highly precise timing resolution for accurate vector analysis
Material Composition
Industrial-grade electronics housed in a shielded enclosure to prevent interference from high-energy transient signals.
Structural Characteristics
Full-height module form factor. Can be installed in any available slot in the 3500 framework. Features BNC inputs for keyphasor probes and buffered pulse outputs on the front panel.
Working Principle
Receives raw AC signals from a proximity probe as a shaft keyway passes. The module conditions this signal into a clean digital pulse, measuring the time between pulses to calculate RPM and providing a precise zero-degree phase reference marker.
Installation Requirements
Connect keyphasor probes using shielded coaxial cables. Ensure the keyway or gear tooth geometry matches the module’s configuration settings in the 3500 software.
Usage Precautions
Verify the keyphasor signal amplitude meets the module’s minimum threshold. Incorrect gap settings on the keyphasor probe can result in missed pulses or false phase readings.
