Description
Bently Nevada 3500/64M
Technical Specifications
- Channels: Four independent channels
- Input Types: High-temperature dynamic pressure transducers
- Input Impedance: 3-wire 10 kΩ, 2-wire 1.5 MΩ to 3.5 MΩ typical
- Dynamic Pressure Sensitivity: 100 mV/psi (1.45 mV/mBar)
- Frequency Response: Configurable bandpass, high-frequency capable
- Filter Options: Configurable bandpass per channel, optional notch filter
- Recorder Output: 4-20 mA per channel
- Power Consumption: Typical monitor power draw within 3500 rack specifications
- Operating Temperature: -30°C to +65°C
- Storage Temperature: -40°C to +85°C
- Humidity: 95% non-condensing
Functional Features
- Simultaneous four-channel pressure monitoring
- Configurable bandpass filters for precise frequency isolation
- Optional notch filter to suppress unwanted frequency noise
- Independent alarm setpoints for each active measured variable
- Buffered transducer outputs for external analysis
- Front panel LEDs for OK, TX/RX, and Bypass indication
- Full compatibility with 3500 Rack Configuration Software
Application Scenarios
- Combustion dynamics monitoring in gas turbines
- Compressor surge and stall detection
- Aeroderivative turbine performance monitoring
- High-temperature industrial process pressure measurement
- Research and development test cell applications
Performance Parameters
- High signal-to-noise ratio through advanced filtering
- Accurate pressure measurement across wide temperature transducer ranges
- Fast update rate suitable for high-frequency pressure events
- Stable calibration over extended operating periods
- Low crosstalk between adjacent channels
Material Composition
- Housing: Ruggedized aluminum or steel chassis
- Internal components: Industrial-grade semiconductors and passive components
- Connectors: High-reliability coaxial and pin connectors
- Filters: Precision passive and active electronic filter networks
Structural Characteristics
- Standard 3500 series module form factor
- Front panel coaxial connectors for buffered signal access
- Rack-mounted with standard card retention hardware
- Modular design allowing field replacement without system recalibration
- Clear LED status indication on front faceplate
Working Principle Pressure transducers convert mechanical pressure into analog voltage signals. The 3500/64M amplifies these signals and routes them through configurable bandpass filters that isolate the frequency band of interest. The filtered signal is then converted to a proportional value that represents dynamic pressure amplitude. This value is compared against user-configured alarm thresholds. The module also provides a buffered unfiltered output for connection to portable analyzers or oscilloscopes.
Installation Requirements
- Install in a standard 3500 series rack slot
- Use only Bently Nevada approved pressure transducers
- Ensure proper polarity when connecting 2-wire and 3-wire transducers
- Maintain adequate rack ventilation to prevent thermal accumulation
- Filter settings must be configured before alarm setpoints are activated
Usage Precautions
- Do not exceed the maximum input voltage rating on any channel
- Verify transducer power supply loading does not exceed module capacity
- Buffered outputs are active circuits; avoid short circuits during probing
- Periodic verification of filter corner frequencies is recommended
- High-temperature transducers require proper heat sinking and isolation
