Description
Product Core Brief
- Model: 135137-01
- Brand: Bently Nevada
- Series: 3500 Machinery Protection System
- Core Function: Conditions signals from LVDTs, rotating potentiometers, and proximity probes for precise axial position and displacement monitoring.
- Product Type: Position I/O Module
- Key Specs: 3500/45 Compatible | DC/AC LVDT Support | Internal/External Terminations
- Note: Verify termination type (internal vs. external) and LVDT type (DC vs. AC) against existing configuration.
Key Technical Specifications
- Compatible Monitor: 3500/45 Position Monitor
- Sensor Compatibility: Eddy Current Probes, DC LVDT, AC LVDT, Rotating PotentiometersBently Nevada 135137-01
- Measurement Functions: Axial Position, Radial Vibration, Eccentricity, Differential Expansion
- Input Channels: 4 channels per module
- DC LVDT Excitation: -10 VDC (Channels 3 & 4 when configured for DC LVDT)
- Operating Temp: -30 °C to +65 °C (-22 °F to +150 °F)
- Storage Temp: -40 °C to +85 °C (-40 °F to +185 °F)
- Humidity: 95% non-condensing
- Outputs: Buffered sensor outputs (short-circuit protected), 4-20 mA recorder outputs
- Mounting: 3500 Rack Backplane
Product Introduction
The Bently Nevada 135137-01 is a Position I/O module designed for the 3500/45 Position Monitor. It provides precision signal conditioning for displacement sensors, enabling accurate measurement of axial position, differential expansion, eccentricity, and radial vibration in rotating machinery.
This module supports multiple sensor types including DC LVDT, AC LVDT, rotating potentiometers, and proximity probes. Its buffered outputs allow external monitoring while maintaining full 3500 system integration for comprehensive machinery protection.
QA & Testing SOP (Transparency Building)
- Incoming Inspection: Verify serial number traceability against OEM records; inspect PCB for rework, corrosion, or damaged connectors; confirm anti-static packaging integrity.
- Live Testing: Install in 3500/45 test rack; verify OK LED and backplane communication; inject simulated LVDT and proximity probe signals to validate position scaling and alarm setpoints.
- Electrical Testing: Measure insulation resistance (>10 MΩ at 500VDC); verify ground continuity <0.1 Ω; test buffered output short-circuit protection.
- Firmware/Config Backup: Record exact firmware revision via 3500 Configuration Software; photograph all DIP switches and jumper settings before packing.
- Final QC & Packaging: Apply QC pass tag with test date; pack in OEM-spec anti-static bag with foam corner protectors; seal in individual box with documentation.
Bently Nevada 135137-01
Installation Pitfalls & Guide (Engineer to Engineer)
❗ Firmware Rev Mismatch: Mixing revisions in a 3500/45 slot can cause position scaling errors or communication timeouts. Always match the exact revision of the replaced unit or update the entire frame via 3500 Configuration Software before commissioning.
❗ DIP Switch/Jumper Errors: Sensor type and termination configuration are critical. Take a high-res photo of the old module’s jumper settings before removal. Incorrect LVDT type selection (DC vs. AC) will cause complete signal loss or erroneous position readings.
❗ Wiring Incompatibilities: This module comes in internal and external termination variants. Do not assume wire-for-wire compatibility. Verify terminal block type against the 3500/45 manual; incorrect wiring can damage the input stage.
❗ DC LVDT Channel Limitations: When using DC LVDTs, only channels 3 and 4 provide -10 VDC excitation. Channels 1 and 2 are NOT compatible with DC LVDT. Verify your sensor allocation before installation.
❗ ESD Dangers: The position input stage is extremely ESD-sensitive. A single static discharge can destroy the precision signal conditioning circuitry. Always wear a grounded wrist strap connected to the rack chassis, not just the bench mat.
Replacement Procedure:
- Pre-install: Back up 3500/45 configuration; photograph jumpers; verify new unit revision and sensor type matches.
- Removal: Power down frame (3500/45 is NOT hot-swappable); wait 60s for capacitor discharge; disconnect field wires; remove module.
- Install: Set jumpers per photo; seat module firmly; reconnect field wires; torque terminal screws to 0.5 Nm.
- Power-on Test: Apply power; verify OK LED; check 3500 Configuration Software for no faults; verify position readings against reference measurement.
FAQ (Frequently Asked Questions)
Q: Can I hot-swap the Bently Nevada 135137-01?
A: No. The 3500/45 Position I/O module lacks hot-swap circuitry. Removing it under power will cause a backplane voltage disturbance, potentially corrupting the configuration of adjacent monitoring modules and risking arc damage to the backplane connector. Always perform a controlled frame shutdown.
Q: Why is my new module showing incorrect position values?
A: Check the sensor type configuration first. If the module is set for AC LVDT but you’re using a DC LVDT (or vice versa), the signal conditioning will be wrong. Also verify the LVDT excitation voltage and that the sensor is properly gapped. Incorrect sensor allocation (using channels 1-2 for DC LVDT) will cause failures.
Q: Is this module interchangeable with other 3500 I/O modules?
A: No. The 135137-01 is specifically engineered for the 3500/45 Position Monitor. It has unique signal conditioning for displacement sensors that differs from vibration or temperature modules. Forcing the wrong module into the slot will not work and may damage the backplane.
Q: What happens if I lose power to this module during operation?
A: You lose all position monitoring and protection. The 3500/45 requires continuous power to process displacement signals and drive alarms. There is no battery backup for position monitoring. Always ensure redundant power supply configuration per API 670 for critical position parameters.
Q: How do I verify if this is a genuine Bently Nevada 135137-01?
A: Check for the Bently Nevada logo etched (not printed) on the PCB; verify the serial number matches the label; inspect solder joints for machine-wave consistency (hand-soldered joints indicate refurbishment or counterfeit). Request the OEM certificate of conformity from the supplier; reputable vendors provide traceability to the original Bently Nevada shipment.
Q: Can I use this module for vibration monitoring?
A: Yes, but only for radial vibration using proximity probes. For velocity or acceleration monitoring, use dedicated 3500/42 modules. The 135137-01 is optimized for displacement and position measurements; using it outside its intended application may compromise measurement accuracy.
Q: What’s the warranty on replacement units?
A: Standard warranty is 12 months from shipment date, covering manufacturing defects and DOA conditions. Warranty does not cover ESD damage, overvoltage from incorrect wiring, or physical damage from improper installation. Always retain the QC test report and original packaging for warranty claims.
