Description
Bently Nevada 3500/42M-01-00 (128229-01)
Technical Specifications:
- Product Series: 3500/42M Shaft Vibration Monitor
- Module Type: 4-Channel Configurable Monitor
- Part Number: 128229-01 (front module)
- Input Signal Range: -10V DC to +10V DC
- Power Consumption: 7.7W
- Axis Power Supply: -24V DC
- Resolution: Up to 24-bit
Functional Features:
- Configurable 4-channel monitoring for multiple measurement types simultaneously
- Accepts eddy current sensor inputs from 3300 XL, 330180, 9200 series and other compatible probes
- Supports velocity, acceleration, and dual-probe (velocity + displacement) input types with signal conditioning including filtering and integration
- Differential signal processing extracts casing vibration from relative shaft vibration for absolute shaft measurement on large turbines
- Built-in automatic calibration ensures measurement accuracy
- Supports adjustable input ranges for different signal source amplitudes
- TüV certified for machinery protection applications
Application Scenarios:
- Radial shaft vibration monitoring on steam turbines and gas turbines
- Axial displacement monitoring on compressors
- Eccentricity measurement during turbine startup
- Differential expansion monitoring on large steam turbines
- REBAM (Radial Expansion and Bearing Alignment Measurement)
- Power generation, petrochemical, metallurgical, and cement industries
Performance Parameters:
- Channels: 4 configurable channels
- Resolution: 24-bit
- Input Signal: -10V DC to +10V DC
- Power Consumption: 7.7W
- Frequency Response: Up to 1 kHz (60,000 cpm)
- Sensitivity: 20 mV/mm/s (500 mV/in/s) ±5% at 100 Hz
- Noise Level: Low noise design for wide dynamic range accuracy
Material Composition:
- Industrial-grade PCB with high-precision analog-to-digital converters
- Metal chassis with rack-mount front panel
- Backplane connectors for 3500 rack interface
Structural Features:
- Full-height module form factor for 3500 rack
- Front panel with status LEDs
- Connects to matching rear I/O module via backplane
- Hot-swappable design for maintenance without rack shutdown
Working Principle: The 3500/42M receives analog voltage signals from proximity probes through the rear I/O module. The module’s 24-bit ADC digitizes the signals with high precision. The onboard processor then applies configurable signal conditioning (filtering, integration, differentiation) based on the selected measurement type. The processed signals are compared against user-programmable alarm setpoints, and the results are distributed via the backplane to relay modules and communication gateways.
Installation Requirements:
- Install in any available slot to the right of the rack interface module
- A matching rear I/O module must be installed behind the front card
- Sensor cables must be connected to the correct I/O module terminals
- Configuration must be downloaded using 3500 rack configuration software
Usage Precautions:
- Verify that the sensor type and sensitivity match the software configuration
- Ensure proper signal cable shielding and single-point grounding
- The module supports hot-swap, but the channel will enter bypass mode during self-test after reinsertion
- Keep firmware versions consistent across all modules in the rack
