Technical Parameters
- Part Number: 103928-02
- Manufacturer: Bently Nevada (Baker Hughes)
- Module Type: Half-height Keyphasor (KPH) Input Board
- Input Channels: 2-channel (Supports two Keyphasor signals)
- Compatible Sensors: Proximitor Sensors, Magnetic Pickups, Optical Pickups
- Signal Output: TTL Compatible (Pulse) / Speed Measurement
- Isolation: 500 Vrms (Galvanic)
- System Series: 3500 Machinery Protection System
Product Description
The Bently Nevada 103928-02 is the internal Printed Wiring Assembly (PWA) for the 3500/25 Keyphasor Module. The Keyphasor is a critical component in machinery diagnostics, providing a once-per-turn (or multiple-per-turn) voltage pulse used to measure shaft rotational speed and phase angle.
The 103928-02 board processes raw signals from transducers and converts them into digital timing pulses used by other modules in the 3500 rack—such as Vibration Monitors—for filtered orbit analysis and phase-synchronous data acquisition. As a “half-height” module, it is typically installed in the 3500 rack using a specific internal interface to maximize slot efficiency.
Application Areas
- Phase Analysis: Determining the mechanical phase of vibration relative to a shaft reference mark.
- Speed Monitoring: Providing highly accurate RPM data for turbines, compressors, and motors.
- Vector Analysis: Essential for generating Bode and Polar plots in Bently Nevada System 1 software.
- Sequence of Events: Tracking machine startup and shutdown timing cycles.
Product Specifications
- Weight: 0.28 kg
- Dimensions: 12.5 cm x 2.4 cm x 10.3 cm (Half-height form factor)
- Country of Origin: United States (USA)
- Operating Temperature: -30°C to +65°C
Operating Precautions
- Threshold Settings: Ensure the “Hysteresis” and “Threshold” settings in the 3500 Rack Configuration Software are correctly tuned to the specific transducer type to prevent “double-triggering.”
- I/O Matching: The 103928-02 board must be paired with the correct 3500/25 I/O module (e.g., 125800-01) located at the rear of the rack.
- Slot Constraints: Note that the 3500/25 module occupies a single slot but is half-height; ensure the rack’s internal plastic guides are properly aligned during insertion to avoid damaging the backplane pins.
- Magnetic Interference: If using magnetic pickups, route signal cables away from high-voltage motor leads to prevent electromagnetic noise from creating false speed pulses.
Recommended Similar Products
| Model Number | Product Description | System Role |
|---|---|---|
| 3500/25 | Complete Keyphasor Module | Full Assembly |
| 125800-01 | Keyphasor I/O Module | Rear Termination |
| 149369-01 | Enhanced Keyphasor Module | High-Speed Pulse |
| 330100 | Proximitor Sensor (5mm/8mm) | Input Source |
| 3500/50 | Tachometer Module | Speed Measurement |
