Description
Product Core Brief
- Model: 3500/45
- Brand: BENTLY NEVADA
- Series: 3500 Machinery Protection System
- Core Function: Monitors axial position, differential expansion, case expansion, and valve position.
- Product Type: 4-Channel Position Monitor
- Key Specs: 4 Channels | LVDT & Proximitor Input | User-Programmable Alarms
- Condition: New Original (New Surplus)
BENTLY 3500/45
Product Introduction
BENTLY 3500/45 is a versatile 4-channel monitor designed for the 3500 Machinery Protection System. It accepts inputs from proximity probes, LVDTs, and rotary potentiometers to process critical position and expansion parameters.
Unlike the 3500/40 which focuses on vibration, this unit handles mechanical clearance and thermal growth. Channels 1 and 2 can be configured for one function while channels 3 and 4 handle another. Well, technically only channels 3 and 4 can execute case expansion monitoring, so plan your I/O layout accordingly.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Module Type | 4-Channel Position Monitor |
| Supported Inputs | Proximitor, RPT, DC LVDT, AC LVDT, Rotary Potentiometer |
| Channel Configuration | Pairs (1&2, 3&4) |
| Supported Functions | Axial Position, Differential Expansion, Case Expansion, Valve Position |
| Sensor Power (Proximitor/RPT) | -24 Vdc |
| Sensor Power (DC LVDT) | +15 Vdc |
| Sensor Power (AC LVDT) | 2.3 Vrms @ 3400 Hz |
| Configuration Tool | 3500 Rack Configuration Software |
| Dimensions | 241.3 mm x 24.4 mm x 241.8 mm |
| Weight | 0.91 kg |
| Compliance | API 670 |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: We check source traceability and verify serial numbers against anti-counterfeit databases. Visual inspection confirms no physical damage or connector corrosion.
- Live Functional Test: Power-on self-checks validate basic operation. We run continuous load tests exceeding 24 hours with temperature logging to ensure stability.
- Electrical Parameter Test: Insulation resistance is verified using a 500 V Megger, requiring >10 MΩ. Ground continuity is also strictly checked.
- Firmware Verification: We read and record internal firmware versions. DIP switch and jumper settings are photographed for future reference.
- Final QC & Packaging: The unit is sealed in an anti-static bag. A QC Passed label with the inspection date is applied before shipping.
BENTLY 3500/45
Replacement Pitfall Guide
❗ Channel Pairing Rules: Channels are programmed in pairs. Channels 1 and 2 execute one function, while channels 3 and 4 execute another. You cannot mix and match individual channels across different functions.
❗ Case Expansion Limitation: Only channels 3 and 4 can execute case expansion monitoring. If your application requires multiple case expansion measurements, you will need additional modules.
❗ I/O Module Selection: The type of measurement and transducer input determines which I/O module is required. Verify your I/O module matches your sensor type (e.g., AC LVDT vs. Proximitor).
❗ Software Compatibility: Full configuration requires 3500 Rack Configuration Software v2.41 or later. Valve position measurement using RPT requires v3.00 or later.
❗ ESD Damage: Use an anti-static mat during installation. Dry environments significantly increase electrostatic discharge risks to sensitive electronics.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
- 3500/45 → 3500/40M : Needs Adaptation — Position/Expansion vs. Vibration/Displacement
- 3500/45 → 3500/42M : Incompatible — Position vs. Proximitor/Seismic Dual Input
- 3500/45 → 3500/46M : Needs Adaptation — Position vs. Hydro Power Specific Monitoring
- Scan Cycle: < 1 ms (simulated load, 4 I/O points)
- Comms Throughput: Backplane interface (Modbus TCP via 3500/22M TDI)
