Description
Bently Nevada 3500/25-01-01-00 Keyphasor Module
The Bently Nevada 3500/25-01-01-00, also cataloged as the 3500/25 Keyphasor module, serves as the primary single-channel phase reference module utilized to execute shaft position indexing across 3500 Machinery Protection System platforms. It converts proximity probe or magnetic pickup analog inputs into TTL-compatible digital timing pulses for downstream speed and vibration processing within rack-based monitoring architecture.
Hardware Specifications
| Parameter |
Specification |
| Model |
3500/25-01-01-00 |
| Brand |
Bently Nevada |
| Origin |
USA |
| Operating Temp |
-30 deg C to +65 deg C |
| Power Consumption |
Provided by 3500 rack |
| Module Type |
Single-Channel Keyphasor Module |
| Channels |
1 input channel |
| Input Types |
Proximity probe or magnetic pickup |
| Signal Range |
±50 V input capability |
| Pulse Output |
TTL-compatible digital pulses |
| Speed Range |
1 to 120000 RPM |
| Communication |
3500 rack / System 1 |
Eddy Current Phase Conditioning and Signal Edge Formation
The module processes eddy-current probe waveform distortion into stable phase-edge detection for once-per-revolution indexing.
Signal conditioning maintains phase integrity under variable air-gap voltage conditions.
The system supports cross-reference alignment for orbit and vector calculation in multi-module 3500 configurations.
Frequently Asked Questions (FAQ)
Q: Does the module support both proximity probes and magnetic pickups on the same channel?
A: The input channel is configurable for either probe type, but not simultaneous dual-sensor operation.
Q: What happens to phase output during rack module replacement?
A: Phase output is interrupted during removal unless redundant Keyphasor modules are installed.
Q: Can the module generate multiple pulses per revolution?
A: Yes, pulse generation can be configured for once-per-turn or multi-pulse encoding depending on system setup.
Field Installation Guidelines
Install the module in an approved 3500 rack slot with correct backplane alignment.
Route probe wiring separately from power conductors to reduce electromagnetic coupling.
Maintain shield continuity to system ground at a single termination point.
Verify probe gap voltage and polarity prior to enabling phase acquisition.
