Description
Bently Nevada 3500/45 135137-01 Position I/O Module
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Product Family | 3500 Machinery Protection System |
| Monitor | 3500/45 Position Monitor |
| I/O Part Number | 135137-01 |
| I/O Type | Position I/O Module |
| Termination | Internal |
| Channels | 4 |
| Compatible Inputs | Proximitor transducers, RPTs, DC LVDTs |
| Position Functions | Axial Position, Differential Expansion, Case Expansion, Valve Position |
| Differential Expansion Modes | Single Ramp, Dual Ramp, Complementary, non-standard single ramp |
| Configuration | 3500 Rack Configuration Software |
| Rack Requirement | 1 full-height front slot for 3500/45 |
| Typical Position Applications | Turbine supervisory instrumentation and rotating machinery protection |
The current Bently Nevada datasheet describes the 3500/45 as a four-channel position monitor. Channel pairs can be configured for position-related functions such as axial thrust position, differential expansion, case expansion, and valve position.
Product Introduction
The Bently Nevada 3500/45 135137-01 is the internal-termination Position I/O Module used with the 3500/45 Position Monitor. It provides the interface between compatible position transducers and the 3500 monitoring electronics. The 135137-01 configuration is specifically identified for Proximitor transducers, rotary position transducers (RPTs), and DC LVDTs.
The associated 3500/45 monitor can process four position channels and compare measured values against user-configured alarm limits. Depending on the configuration, the channels can be used for axial/thrust position, differential expansion, case expansion, or valve-position measurements.
135137-01
Application Scenarios & Field Pitfalls — Engineer’s Perspective
The 135137-01 is primarily found in turbine supervisory instrumentation and machinery protection systems where shaft position, casing movement, differential expansion, or valve position must be continuously monitored. The module is commonly encountered in steam-turbine and other rotating-equipment applications using Bently Nevada 3500 monitoring hardware.
Common Applications
- Axial/thrust position monitoring: Measurement of turbine shaft axial movement.
- Differential expansion: Monitoring relative movement between rotor and casing.
- Case expansion: Measurement of turbine casing growth during startup and operation.
- Valve position: Position feedback associated with turbine control and supervisory monitoring.
Field Pitfalls
1. 135137-01 is not the complete 3500/45 monitor.
The 135137-01 is the Position I/O Module with internal terminations. The complete monitoring function also depends on the 3500/45 monitor electronics and the selected transducer.
2. Input type must be matched.
The 135137-01 is intended for Proximitor, RPT, and DC LVDT applications. The 3500/45 family also has separate I/O modules for AC LVDTs and rotary potentiometers. Those alternatives should not be substituted merely because they fit the same rack.
3. Internal and external termination versions are different procurement items.
Bently Nevada lists 135137-01 for internal terminations and 135145-01 for external terminations. If the existing rack wiring uses an external termination block, the two should not be assumed interchangeable.
4. Probe calibration is part of the measurement chain.
For proximity-based position measurements, verify the installed probe type, extension cable, signal conditioner, target material, mechanical gap, and calibration. Replacing the I/O module alone does not correct a mechanically incorrect probe installation.
5. Do not substitute by channel count alone.
The 3500/45 supports several measurement functions, but the appropriate I/O hardware depends on the transducer technology. Confirm the existing 3500/45 configuration before approving a replacement.
Related Products
- 3500/45 — Four-channel Position Monitor that uses the 135137-01 I/O configuration.
- 135145-01 — Position I/O Module with external terminations for Proximitor, RPT, and DC LVDT applications.
- 139554-01 — AC LVDT Position I/O Module with internal terminations.
- 139567-01 — AC LVDT Position I/O Module with external terminations.
- 139978-01 — Rotary potentiometer Position I/O Module with internal terminations.
- 139991-01 — Rotary potentiometer Position I/O Module with external terminations.
- 128015-06 — External termination block for Proximitor, RPT, and DC LVDT inputs.
- 125808-06 — Position-Prox/DC LVDT European termination block.
- 3300XL Proximitor System — Compatible Bently Nevada proximity-transducer technology used for applicable position measurements.
- 3500/42M — Related 3500 machinery protection monitor for proximity/seismic measurements, but with a different measurement function.
Procurement Note
For a like-for-like replacement, specify Bently Nevada 3500/45, 135137-01, and confirm that the existing system requires the internal-termination Proximitor/RPT/DC LVDT I/O configuration. Also verify the installed transducer type and the 3500 rack configuration.
Engineering caution: Do not describe 135137-01 simply as a generic “vibration I/O card.” Its documented role is specifically the Position I/O interface for the 3500/45 system. The distinction is important when replacing a module in a turbine protection rack.
