Bently Nevada 3500/45 Position Monitor
A four-channel monitor for thrust, differential-expansion, case-expansion and valve-position measurements in a 3500 rack.
Product Profile
3500/45 is the Bently Nevada position-monitor family for machines that require displacement or mechanical-position protection. It accepts several sensor technologies through the corresponding rear I/O module.
Channels operate in pairs, so the intended measurement functions and sensor types must be mapped before selecting hardware or restoring configuration.
Technical Data
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Model | 3500/45 |
| Product Family | 3500 Machinery Protection System |
| Module Type | Four-channel Position Monitor |
| Supported Sensor Families | Proximity transducers, RPTs, DC LVDTs, AC LVDTs and rotary potentiometers |
| Channel Architecture | Four channels configured in pairs |
| Simultaneous Functions | Up to two measurement functions |
| Rack Position | One full-height front slot with matching rear I/O slot |
| Current Main Monitor Spare | 176449-04 |
System Role
- Measurement processing for axial position, differential expansion, case expansion and valve position.
- Support for standard, nonstandard, dual-ramp and complementary differential-expansion arrangements.
- Programmable alert and danger behavior with configurable time delays.
- Sensor-specific rear I/O options for internal or external field termination.
Compatibility
- Select Prox/RPT/DC LVDT, AC LVDT or rotary-potentiometer I/O to match the field sensor.
- Internal and external termination variants require their corresponding wiring architecture.
- Confirm rack firmware and configuration support for the intended measurement function.
Applications
- Steam-turbine thrust and differential-expansion protection.
- Case-expansion measurement with compatible LVDT arrangements.
- Valve-position monitoring with a documented rotary potentiometer or displacement sensor chain.
FAQ
Which rear I/O module is required for 3500/45?
Select it from the field sensor technology and whether the installation uses internal or external termination.
Can AC and DC LVDTs use the same 3500/45 rear I/O?
No. The sensor excitation and interface requirements differ, so the appropriate I/O must be selected.
How should channel pairs be planned on 3500/45?
Map each measurement function, sensor input and reference arrangement before configuring the paired channels.
Can the main monitor spare be ordered for 3500/45 without checking rear I/O?
No. The rear module, field sensor and termination method still have to be identified for a complete maintenance plan.
What must be retained during a 3500/45 replacement?
Preserve sensor type, rear I/O, scaling, mechanical zero, alarms, delays and rack communications.
What commissioning evidence is appropriate for 3500/45?
Document sensor response, mechanical reference, displayed values, alarms, relays and communication outputs.
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