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Help CenterBENTLY 3500/72M Dual-channel Vibration Monitoring Module
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BENTLY 3500/72M dual-channel vibration monitoring module
Core performance
Multi-parameter fusion measurement capability
Measurement type:
Shaft vibration (eddy current sensor) : Real-time monitoring of the radial displacement of the rotor relative to the
bearing (peak-to-peak value), with a range typically of 0-508μm (0-0.020in);
Bearing vibration (velocity/acceleration sensor) :
Velocity mode: Measure the vibration velocity (RMS value) of the bearing housing, with a range of 0-25.4mm/s
(0-1.0in/s);
Acceleration mode: Measure the vibration acceleration (RMS value) of the bearing housing, with a range of 0-100g
(optional);
Shaft eccentricity: Synchronously monitor the eccentricity of the rotor (peak-to-peak value) to diagnose rotor bending
or imbalance issues.
Dual-channel independent monitoring: Each channel can be independently configured with sensor types (eddy
current/velocity/acceleration), supporting simultaneous monitoring of vibration signals in two radial directions (such
as X/Y axes) or at different positions within the same axis system.
2. High-precision signal processing technology
Hardware features:
Sampling rate: Up to 10kHz for a single channel to ensure the capture of high-frequency vibration details.
Resolution: 16-bit A/D conversion, linearity ≤±0.5% of full scale, measurement accuracy ±1μm (shaft vibration) or
±0.1mm/s (velocity vibration);
Anti-interference design: Built-in EMI/RFI filtering, supporting stable measurement in complex electromagnetic
environments of industrial sites.
Signal analysis function:
Spectrum analysis: Supports FFT (Fast Fourier Transform), capable of calculating 1x, 2x, 3x... Equal frequency doubling
components are used to identify characteristic frequencies such as imbalance, misalignment, and bearing faults;
Time-domain waveform: Real-time output of vibration waveform data to assist in fault location;
Filtering configuration: Low-pass, high-pass and band-pass filtering (10Hz-1kHz) can be set to eliminate
environmental noise interference.
3. Flexible alarm and protection mechanism
Multi-level threshold Settings: Each channel supports two levels of thresholds, Warning and Danger, and the delay
time (0-30 seconds) can be independently configured.
Output signal:
Analog quantity: 4-20mA isolated output (2 channels per channel, corresponding to the original value and spectral
value respectively), load ≤500Ω;
Digital quantity: Real-time data, waveforms and analysis results are transmitted through the 3500 system bus,
supporting integration with PLC/DCS systems.
Relay output: When the module malfunctions or parameters exceed the limit, it can trigger the external relay to act
(such as alarm light, shutdown interlock).
4. Industrial-grade reliability design
Environmental adaptability
Operating temperature: -40℃ to + 70℃, storage temperature: -40℃ to + 85℃
Protection grade: Complies with IP54 standard (installed within a 3500 frame), resistant to vibration (peak value of 50g)
and shock (peak value of 500g);
Redundancy and maintenance characteristics:
Supports hot plugging (operation after power failure), facilitating online module replacement;
Self-check function: Automatically verify sensor connections upon startup, diagnose hardware faults, and the LED
indicator light displays the working status in real time (normal/alarm/fault).
5. Compatibility and System Integration
Sensor adaptation
Eddy current sensor: Supports BENTLY 3300/3400 series probes (such as 330102, 330903);
Speed sensor: Compatible with BENTLY 330500 series or third-party magnetoelectric speed sensors;
Acceleration sensor: Supports IEPE (integrated piezoelectric) accelerometer (external excitation configuration required)
System interface: Through the TriconEX or Modbus communication protocol of the 3500 framework, it interfaces with
the upper computer (such as BENTLY Nevada System 1) or third-party monitoring systems to achieve data storage and
trend analysis.
Typical application scenarios
Turbine/generator shaft vibration monitoring: Real-time monitoring of rotor radial vibration, and identification of faults
such as imbalance (1x frequency) and misalignment (2x frequency) through spectral analysis;
Compressor bearing vibration monitoring: Evaluate the bearing wear state by using the speed/acceleration mode and
capture early fault characteristics (such as high-frequency impact of rolling element damage);
Health diagnosis of fan/pump equipment: Based on vibration trend analysis, predict the remaining service life of the
equipment and optimize maintenance plans;
Nuclear power/petrochemical critical equipment protection: Meeting industrial standards such as API 670 and ISO
10816, providing redundant monitoring solutions for high-reliability scenarios.
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