Description
The Bently Nevada 3500/42M-01-00 is a four-channel machinery protection monitor designed to accept input from proximity transducers, seismic sensors, and velocity sensors. It continuously processes these signals to provide critical vibration and position measurements, comparing them against user-defined alarm setpoints to drive machinery protection relays and prevent catastrophic asset failure.
Commercial & Availability Status
- Product Condition: New Original (New Surplus) in factory-sealed packaging
- Warranty Period: 12-month comprehensive technical warranty
- Availability: In stock at our global warehouse facilities
- Estimated Lead Time: Ships within 1 to 3 business days worldwide via DHL/FedEx
- Pricing Notice: Price subject to market conditions; contact us for a firm quote
Technical Specifications
| Parameter | Value |
| Brand | Bently Nevada (Baker Hughes) |
| Model Number | 3500/42M |
| Option Structure | -01-00 (Proximitor/Seismic I/O Module with Internal Terminations) |
| Channel Count | 4 independently configurable channels |
| Input Signal Types | Proximitor, Accelerometers, Velocity Transducers |
| Power Consumption | 7.7 W typical |
| Signal Conditioning | High-pass, Low-pass, and Band-pass digital filtering |
| A/D Conversion | 24-bit sigma-delta |
| Accuracy | Within ±0.33% of full-scale value typical |
| Output Interfaces | 4 to 20 mA DC recorder outputs (buffered outputs per channel via front panel) |
| I/O Module Type | Internal Termination (Prox/Seismic) |
| Operating Temperature | −30 to +65 °C |
| Storage Temperature | −40 to +85 °C |
| Relative Humidity | 95% non-condensing |
| Hazardous Area Approvals | CSA/NRTL/C, ATEX, IECEx Class I, Div 2 / Zone 2 |
Configuration Code Breakdown
The model number 3500/42M-01-00 represents a specific hardware configuration tailored for distinct field wiring practices:
- 3500/42M: Proximitor/Seismic Monitor Main Module (processes the algorithms and manages the alarm logic).
- -01: Proximitor/Seismic I/O Module with Internal Terminations. This choice dictates that field wiring lands directly on the terminal blocks mounted to the back of the 3500 rack, rather than utilizing external termination blocks.
- -00: No Agency Approvals selected for this specific part number subset (Note: Verify exact regional regulatory compliance sheets, as rack-level approvals may apply).
Engineering Field Notes & Integration Constraints
Critical Application Context: The 3500/42M utilizes different I/O modules depending on your termination scheme. The
-01-00options variant is specifically designed for point-to-point wiring from the field directly to the rack backplane. Do not attempt to connect this I/O module to External Termination (ET) Blocks via multi-conductor cables, as the pinouts are electrically incompatible and will cause channel faults.
Configuration and Firmware Compatibility
When programming the 3500/42M via the 3500 Rack Configuration Software, channel pairs (1 & 2, and 3 & 4) share certain processing resources. While you can configure individual channels for different measurements (e.g., Channel 1 tracking Radial Vibration and Channel 2 tracking Thrust Position), you must ensure that the transducer scale factor matching matches the physical sensor connected to that port. Incompatible configuration settings will trip the “Not OK” status LED.
Sensor Grounding and Shielding
To prevent ground loops from injecting 50/60 Hz hum or high-frequency switching noise into the 24-bit A/D converters, ensure that sensor shields are isolated at the machine casing. Connect all shields cleanly at the 3500/42M I/O module COM terminal only.
Frequently Asked Questions
Can I hot-swap this module while the rest of the 3500 rack is powered and online?
Yes. The 3500/42M monitor main module can be hot-swapped without powering down the rack. However, removing a monitor will cause its associated channels to go into an invalid status, which will drop any related voting logic loops or relays. Ensure that any interlinked emergency shutdown (ESD) matrix functions are bypassed or placed in manual override prior to extraction.
What is the purpose of the coaxial buffered outputs on the front panel?
The front-panel BNC connectors provide raw, un-isolated, buffered voltage signals directly from each connected field transducer. These outputs allow machinery diagnostic specialists to hook up portable dynamic signal analyzers (such as a Bently Nevada ADRE system) for orbit analysis, spectrum analysis, and troubleshooting without disturbing permanent machine protection operations.
How do I switch a channel from a Proximitor input to a Velocity sensor input?
This alteration cannot be achieved via physical hardware jumpers alone. You must connect a PC running the 3500 Rack Configuration Software to the rack’s standard Transient Data Interface (TDI) module, modify the specific channel profile properties under the slot options, and then download the revised configuration file. Verify compatibility with the OEM datasheet for exact sensor scale factor entries.
