Description
Bently Nevada 3500/42-07-00
Technical Specifications:
- Module Type: Full-height, 4-channel configurable monitor
- Input Signal Range: -10V DC to +10V DC
- Power Consumption: 7.7 watts typical
- Sensor Power Supply: -24V DC
- Resolution: Up to 24-bit
- Frequency Response: Up to 1 kHz (60,000 cpm)
- Input Impedance: 50 kΩ effective (bus-type TMR I/O channels in parallel to one sensor)
- Operating Temperature: -30°C to +65°C (-22°F to +150°F)
- Storage Temperature: -40°C to +85°C (-40°F to +185°F)
- Humidity: 95% non-condensing
- Agency Approval: None
Functional Features:
- Configurable 4-channel monitor accepting proximity and seismic sensor inputs
- Programmable measurement functions include: radial vibration, axial position (thrust), differential expansion, eccentricity, acceleration, velocity, and absolute shaft vibration
- Channels are programmed in pairs — Channels 1&2 perform one function, Channels 3&4 perform another (or the same) function
- Differential signal processing: extracts casing vibration from relative shaft vibration for absolute shaft measurement on large gas and steam turbines
- Built-in automatic calibration function
- Up to 24-bit resolution with low noise level
- Multiple adjustable input ranges for different signal source amplitudes
- Returns module and channel OK status to the rack
- Field-upgradeable firmware
Application Scenarios:
- Large steam turbine and gas turbine absolute shaft vibration monitoring
- Applications where casing vibration extraction is required
- Power generation, petrochemical, and metallurgical industries
- Compressor, pump, and fan vibration protection
Performance Parameters:
- Channel count: 4 channels per module (programmed in pairs)
- Measurement accuracy: ±0.5% full scale
- Vibration measurement range: 0–1000 μm peak-to-peak
- Displacement measurement range: 0–2000 μm
- Frequency response: 0.5–1000 Hz (vibration), 0–100 Hz (displacement)
- Output signal: 4–20 mA DC (isolated), relay contacts (2A/250V AC)
Material Composition:
- High-reliability electronic components on multi-layer PCB
- Metal module enclosure with conformal coating
- Gold-plated backplane edge connectors
Structural Features:
- Full-height module form factor
- Front panel with OK, TX/RX, and Bypass LED indicators
- Rear I/O module with internal terminal connections for absolute shaft vibration sensors
- Plug-in design compatible with any accessible rack slot
Working Principle:
The 3500/42-07-00 receives analog signals from proximity probes and seismic sensors via the I/O module. It performs differential signal processing to extract casing vibration from relative shaft vibration, calculates absolute shaft vibration, compares the measured values against user-programmable alarm setpoints (Alert and Danger), and drives alarm outputs when setpoints are exceeded. The module also returns 4–20 mA analog outputs proportional to the measured values.
Installation Requirements:
- Install the main module (176449-02) in any accessible full-height rack slot
- Install the corresponding I/O module in the rear slot
- Configure channel types, measurement functions, alarm setpoints, and filter parameters via 3500 Rack Configuration Software
- Connect sensor cables to the I/O module internal terminals
