Description
Product Description
The Bently Nevada 3500/40M-01-05 Proximitor Monitor is a four-channel condition monitoring module designed for continuous vibration and shaft position measurement within the 3500 Machinery Protection System. It processes proximity probe signals and converts them into stable, engineering-unit data for protection and diagnostics of rotating equipment.
This module supports flexible channel pairing, allowing configuration for multiple measurement tasks including radial vibration, thrust position, eccentricity, differential expansion, and REBAM monitoring. It is commonly deployed in turbine trains, compressors, generators, and other critical rotating assets where early detection of mechanical instability is required.
Core Functional Characteristics
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Accepts input from up to 4 proximity transducers
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Independent channel configuration with paired logic for advanced measurement modes
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Real-time signal conditioning and alarm comparison against user-defined setpoints
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Integrated buffered outputs for each channel for external diagnostics or analysis systems
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Designed for high reliability in continuous machinery protection environments
Technical Specifications
Input Configuration
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Channels: 1 to 4 proximity probe inputs
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Sensor type: Eddy-current proximity transducers
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Input impedance: 10 kΩ (standard configuration), up to 50 kΩ in TMR configurations
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Transducer excitation: regulated −24 VDC supply
Measurement Capabilities
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Radial vibration sensitivity: 3.94 mV/µm (100 mV/mil) or 7.87 mV/µm (200 mV/mil)
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Thrust position and eccentricity: equivalent scaling to radial vibration inputs
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Differential expansion scaling: 0.394 mV/µm (10 mV/mil)
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REBAM high-sensitivity mode: up to 80 mV/µm (2000 mV/mil)
Signal Processing Bandwidth
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Direct filter range: 4 Hz to 4000 Hz (configurable)
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Low-frequency gap filter: −3 dB at approximately 0.09 Hz
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Not-1X filter range: 60 cpm up to 15.8× running speed
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Vector processing: constant-Q filtering with high stopband rejection (~−57 dB typical)
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Smax tracking range: 0.125 to 15.8× running speed
Outputs and Diagnostics
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Buffered coaxial outputs per channel (short-circuit protected)
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Output impedance: 550 Ω
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Front-panel status indicators: OK, TX/RX communication, bypass mode
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Integrated system communication with 3500 rack architecture
Applications
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Steam and gas turbines
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Centrifugal compressors
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Pumps and industrial drivetrains
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Power generation rotating equipment
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Oil & gas process machinery monitoring systems
FAQ
Q: Can the module perform both vibration and position measurement simultaneously?
A: Yes. Channel pairing allows simultaneous configuration for vibration, thrust, and related shaft dynamics measurements.
Q: Is this module compatible with all 3500 rack systems?
A: It is designed for standard Bently Nevada 3500 rack architectures and integrates directly with compatible I/O modules.
