Description
The Bently Nevada 3500/42-01-00 (more commonly referenced as the 3500/42M with part number 128121-01) is a 4-channel Proximitor / Seismic Monitor Module manufactured by Bently Nevada (Baker Hughes) for the 3500 Series Machinery Protection System.
Designed for continuous, high-reliability machinery protection, the 3500/42M accepts input from proximity, seismic (velocity and acceleration), and shaft absolute transducers. It conditions these signals to provide various vibration and position measurements used for machinery protection and condition monitoring, triggering alarms if vibration parameters exceed predetermined thresholds.
Technical Specifications
| Parameter | Specification |
| Manufacturer | Bently Nevada / Baker Hughes |
| Product Series | 3500 Series Machinery Protection System |
| Model / Type | 3500/42M Proximitor / Seismic Monitor |
| Part / Catalog Number | 3500/42-01-00 (Module assembly: 128121-01) |
| Number of Channels | 4 independent channels |
| Inputs | Accepts proximity transducers, seismoprobes (velocity), accelerometers, and shaft absolute sensors |
| Signal Processing | Configurable for radial vibration, thrust position, differential expansion, acceleration, velocity, and shaft absolute measurements |
| Power Consumption | 7.0 Watts typical |
| I/O Module Options | Internal Termination (IT) or External Termination (ET) I/O modules (e.g., 125744-01 or 125760-01) |
| Operating Temperature | -30°C to +65°C (-22°F to +149°F) |
Core Features & Operating Capabilities
- Multi-Transducer Versatility: Highly flexible software-configurable channel types allow the same physical hardware module to monitor radial vibration, thrust position, eccentricity, or casing vibration depending on configuration and I/O pairing.
- Proportional Analog Outputs: Provides recorders/DCS scaled 4–20 mA current outputs or voltage outputs corresponding to the measured variable for each channel.
- Prognostic & Diagnostic Alarms: Features independently adjustable Alert and Danger setpoints per channel, complete with user-programmable alarm time delays to prevent nuisance trips.
- Digital Communication Integration: Connects seamlessly with the 3500 rack rack interface module (RIM) to transmit real-time static and dynamic waveform data to System 1 software for advanced machinery diagnostics.
- Hot-Swappable Design: Fully compliant with 3500 rack standards, allowing live insertion or removal of the module without disrupting system power or neighboring protection loops.
Related Bently Nevada 3500 Components
- 3500/22M — Transient Data Interface (TDI) module.
- 3500/15 — Power Supply Module (AC/DC variants).
- 3500/05 — 3500 System Rack Frame.
- System 1 Evolution — Enterprise software platform for condition monitoring and diagnostics.
