Description
Bently Nevada 3500/25-01-02-00
Technical Specifications:
- Module Type: Half-height, 2-channel
- Power Consumption: 3.2 watts typical
- Input Signal Range (Non-Isolated I/O): +0.8V to -21.0V
- Input Impedance: Minimum 21.8 kΩ
- Auto Threshold: Minimum trigger signal amplitude 2V peak-to-peak; minimum frequency 120 rpm (2 Hz)
- Manual Threshold: User-selectable 0 to 20 VDC; minimum trigger signal amplitude 500 mV peak-to-peak
- Hysteresis: 0.2 to 2.5V, user-selectable
- Buffered Output Impedance: 504 Ω maximum
- Sensor Power Supply: -24 VDC, maximum 40 mA per channel
- Operating Temperature: -30°C to +65°C
- Storage Temperature: -40°C to +85°C
- Humidity: 95% non-condensing
Functional Features:
- Receives signals from eddy current proximity probes or magnetic pickups
- Converts analog input to digital keyphasor pulses for shaft phase reference
- Provides two buffered keyphasor outputs accessible via front panel coaxial connectors and rear Euro-connector
- Automatic and manual threshold detection modes
- Records shaft speed from each keyphasor sensor
- Returns module and channel status to the rack
- Field-upgradeable firmware
- Generates once-per-revolution event signals from multiple-per-revolution inputs
- Fully backward-compatible with legacy 3500 Keyphasor module (PWA 125792-01)
Application Scenarios:
- Turbine Supervisory Instrumentation (TSI) systems
- Vibration vector measurement in rotating machinery
- Compressor, pump, fan, and motor monitoring
- Phase-synchronous data acquisition for orbit plots and Bode/Polar diagrams
- Applications where CSA/NRTL/C agency approval is not required
Performance Parameters:
- Channel count: 2 channels per module
- Maximum keyphasor signals per system: 4 (standard), 8 (paired configuration)
- Minimum detectable frequency: 120 rpm (2 Hz) with auto threshold
- Minimum detectable frequency: 1 rpm (0.017 Hz) with manual threshold
- Passive magnetic pickup minimum shaft speed: 200 rpm (3.3 Hz)
Material Composition:
- High-reliability electronic components on multi-layer PCB
- Metal module enclosure with conformal coating
- Gold-plated backplane edge connectors
- Coaxial connectors for buffered output
Structural Features:
- Half-height module form factor
- Front panel with OK and TX/RX LED indicators, plus two coaxial buffered output connectors
- Rear I/O module (full-height) with external terminal connections
- Plug-in design compatible with any accessible rack slot
Working Principle:
Identical to the 3500/25-01-01-01 — the module receives analog signals from proximity probes or magnetic pickups, applies threshold detection and hysteresis filtering, and generates a clean digital keyphasor pulse each time the shaft keyphasor mark passes the sensor. This digital signal serves as a phase reference for all monitor modules in the rack.
Installation Requirements:
- Install the half-height main module in any accessible rack slot (top or bottom half-slot position)
- Install the corresponding I/O module (126648-01) in the full-height rear slot
- Each rack supports a maximum of two keyphasor main modules
- Connect sensor cables to the I/O module external terminals
- Configure threshold mode and hysteresis via 3500 Rack Configuration Software
Usage Notes:
- The “-02” I/O variant uses external terminals, which are suitable for applications where field wiring connections are made at a separate terminal block
- The “00” agency approval option indicates this module is intended for applications where CSA/NRTL/C certification is not required
- The 149369-01 module directly replaces the legacy 125792-01 Keyphasor module
- For paired (redundant) configuration, two consecutive monitoring positions are required
