Introduction to the Bently Nevada 3500/42M-09-00 176449-02 and 140471-01
This combination represents a core machinery protection solution from Bently Nevada.
The Bently Nevada 3500/42M-09-00 (Part Number: 176449-02) is a Quad-Channel Proximitor® Monitor Module. It is a critical component within the 3500 rack-based monitoring system, specifically designed to condition, monitor, and process signals from eddy-current proximity probes.
The 140471-01 is a complete 8 mm Proximity Transducer System, which includes an 8 mm probe, an extension cable, and a proximitor (the signal conditioner/demodulator that is often mounted locally on the machine).
How They Work Together:
The 140471-01 transducer system measures the relative displacement of a machine shaft. The probe generates a radio frequency (RF) signal, and the gap between the probe tip and the shaft affects the signal's strength. This signal is sent to the proximitor, which converts it into two key DC voltages: a dynamic AC signal representing vibration (peak-to-peak in mils or µm) and a static DC signal representing the average gap position (in VDC). These conditioned signals are then wired to the 3500/42M module. The module continuously monitors these values, comparing them to user-configured Alert and Danger setpoints. If a setpoint is exceeded, the module communicates the alarm status to the rest of the 3500 system, which can then trigger alarms, initiate a shutdown via a relay module, and provide data to diagnostic software.
Key Parameters
The following table outlines the key specifications for both components.
| Parameter | 3500/42M-09-00 176449-02 (Monitor Module) | 140471-01 (8 mm Proximity Transducer System) |
|---|---|---|
| Part Number | 176449-02 | 140471-01 |
| Description | Quad-Channel Proximitor Monitor Module | 8 mm Proximity Transducer System (Probe, Cable, Proximitor) |
| System Compatibility | Bently Nevada 3500 Rack | Compatible with Bently Nevada monitors like the 3500/42M |
| Module Slot Width | Single Slot | N/A (External Sensor System) |
| Dimensions (H x W x D) | Approx. 193 mm x 21 mm x 260 mm (7.6 in x 0.83 in x 10.24 in) | Probe: 8 mm diameter, length as specified Proximitor: Standard chassis or rail mount. |
| Weight | Approx. 0.45 kg (1.0 lb) | Kit Weight: Approx. 0.9 - 1.4 kg (varies with cable length) |
| Key Function | 4-channel monitor for vibration and position; provides alarms and 4-20mA outputs. | Measures shaft relative vibration and position. |
| Channels | 4 independent channels. | 1 channel per system. |
| Input Signal | Accepts conditioned signals from an external proximitor (-2 to -18 VDC gap, plus AC vibration). | Output to Monitor: -2 VDC to -18 VDC gap voltage (position), plus AC vibration signal. |
| Probe Diameter | N/A | 8 mm |
| Linear Range | N/A | 2.0 mm (80 mils) typical, +/- 4.0 mm from electrical null. |
| Sensitivity | Configurable for standard probe sensitivities (e.g., 200 mV/mil). | 200 mV/mil (7.87 V/mm) ± 2% |
| Gap Voltage (Position) | Monitors the static DC voltage to ensure probe is within its linear range. | Typically -10 VDC ± 1 V at recommended gap. |
| Operating Temperature | -20°C to +65°C (rack operating temp) | Probe: -35°C to +177°C Proximitor: -55°C to +120°C |
Application Scenarios
This combination is the industry standard for protecting the most critical rotating assets in a plant. It is used for both radial vibration and axial thrust position monitoring.
Turbine-Generator Sets:
Radial Vibration: Multiple 8 mm probes are installed at each bearing to monitor shaft relative vibration, protecting against unbalance, misalignment, and oil whip. The 3500/42M provides the primary protection by tripping the unit via a relay module if dangerous vibration levels are detected.
Axial Position: A pair of 8 mm probes are used to monitor the thrust collar position of a steam or gas turbine to prevent catastrophic damage from excessive rotor float and thrust bearing failure.
Centrifugal and Axial Compressors:
Essential for monitoring high-speed compressors in LNG, refinery, and petrochemical services. The system safeguards the compressor by detecting shaft vibration issues and critically monitoring rotor axial position to avoid rotor-stator contact.
Large High-Speed Pumps and Motors:
Used on critical boiler feed pumps, reactor charge pumps, and large motors where bearing failures can lead to severe secondary damage and prolonged downtime. The system provides continuous, reliable monitoring for predictive maintenance and machine protection.
Hydro Turbines and Turboexpanders:
Applied in various energy conversion machinery to monitor shaft stability and axial position, ensuring efficient and safe operation while protecting expensive rotor assemblies.
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