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The 3500/25 (125800-01) is a dual-channel Keyphasor I/O module designed for the Bently Nevada 3500 Monitoring System. This half-height module provides precise phase and timing reference signals for rotating machinery...
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The 3500/25 (125800-01) is a dual-channel Keyphasor I/O module designed for the Bently Nevada 3500 Monitoring System. This half-height module provides precise phase and timing reference signals for rotating machinery diagnostics.
It converts input signals from proximity probes or magnetic pickups into conditioned digital timing pulses. These pulses are used by the monitoring system to calculate rotational speed and synchronous vibration parameters such as 1X amplitude and phase angle—critical for orbit analysis, vector calculations, and multi-plane balancing.
The 125800-01 configuration features internal terminations that simplify field wiring and reduce installation complexity. It is fully compatible with Triple Modular Redundant (TMR) rack architectures, ensuring high availability in mission-critical machinery protection systems. Backward compatibility allows seamless integration into existing 3500 system installations.
| Parameter | Specification |
|---|---|
| Model | 3500/25 |
| Part Number | 125800-01 |
| Module Type | Dual-channel Keyphasor I/O |
| Input Type | Proximity probe or magnetic pickup |
| Operating Voltage | 12–32 VDC |
| Input Current | ≤ 10 mA |
| Output Signal Range | 0–10 VDC |
| Output Drive Capacity | ≤ 20 mA |
| Phase Accuracy | ±0.5° |
| Frequency Bandwidth | 0 Hz to 10 kHz |
| Dimensions (H × W × D) | 24.2 cm × 11.2 cm × 2.5 cm |
| Weight | 1.38 kg |
The 3500/25 module is widely used in:
Steam turbine protection systems
Centrifugal compressor monitoring
Large motor vibration diagnostics
Power generation and petrochemical rotating equipment
It provides the phase reference required for synchronous vibration measurement, orbit plots, and balancing procedures in high-value rotating assets.
Does the 125800-01 support TMR configurations?
Yes. The module is designed for operation in both simplex and Triple Modular Redundant (TMR) 3500 rack configurations, supporting high-availability applications.
What types of sensors are compatible?
The 3500/25 accepts signals from proximity probe systems (e.g., Proximitor®) and magnetic pickups that generate once-per-turn timing pulses.
