Description
Bently Nevada 3500/25-01-01-00 149369-01
Technical Specifications:
- Module Type: Half-height, two-channel Keyphasor module
- Channels: Two half-height channels per module
- Input Signal: Proximity probes or magnetic pickups
- Input Voltage Range (Non-isolated I/O): +0.8 V to +21.0 V
- Input Voltage Range (Isolated I/O): +5 V to -11 V
- Passive Magnetic Pickup Requirement: Minimum shaft speed of 200 rpm (3.3 Hz)
- Output Signal: Digital Keyphasor signal
- Frequency Range: Up to 20 kHz
- Accuracy: ±1% cpm for high-frequency signals
- Operating Temperature: -30°C to +65°C (non-isolated I/O), 0°C to +65°C (isolated I/O)
- Storage Temperature: -40°C to +85°C
- Humidity: 5% to 95% non-condensing
- Dimensions: 119.9 mm × 24.4 mm × 256.5 mm
- Weight: 0.34 kg
Functional Features:
- Multi-signal capability handling up to four Keyphasor signals in normal configuration and eight in paired configuration
- Supports once-per-turn or multiple events per turn
- Enhanced processing replacing older 125792-01 module
- Expanded signal processing allows more precise rotational monitoring
- Input flexibility accepting proximity probes or magnetic pickups with isolated or non-isolated I/O
- Reliability indicators monitoring signal ranges and ensuring output stability
- Compatible with legacy systems while offering upgraded performance
Application Scenarios:
- Steam and gas turbine rotational speed monitoring
- Compressor phase reference measurement
- Generator vibration phase analysis
- Shaft rotational speed measurement
- Keyphasor reference signal generation for vibration monitoring
Performance Parameters:
- Frequency Response: Up to 20 kHz
- Accuracy: ±1% cpm
- Output Stability: Monitored across full frequency range
- Signal Detection: Precise coincidence detection between Keyphasor mark and shaft transducer
Material Composition:
- Housing: Industrial-grade metal enclosure
- Circuit Board: Multi-layer printed circuit board with advanced signal processing circuits
- Connectors: Industrial-grade signal input terminals
Structural Characteristics:
- Half-height module design allowing two channels per slot
- Front panel LEDs for status indication
- Isolated and non-isolated I/O options available
- Modular design for easy field replacement
Working Principle: The module receives analog signals from proximity probes or magnetic pickups mounted on rotating machinery. It processes these signals to detect the Keyphasor reference mark on the rotating shaft. When the mark passes the transducer, the module generates a precise digital pulse. This pulse provides the phase reference necessary for vibration analysis and rotational speed measurement.
Installation Requirements:
- Install in any available half-height slot in the 3500 rack
- Proximity probes or magnetic pickups must be properly aligned with shaft reference marks
- Ensure proper grounding of sensor cables
- Configure input type (proximity probe or magnetic pickup) in rack configuration software
Use Precautions:
- Passive magnetic pickups require minimum shaft speed of 200 rpm
- Isolated and non-isolated I/O modules have different temperature ranges
- Ensure compatibility with existing 3500 system software versions
- Verify signal polarity when connecting magnetic pickups
- Module replacement should maintain same I/O type configuration
