Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Part Number | 135473-01 |
| System | 3500 Machinery Protection System |
| Monitor Position | 3500/25 |
| Module Type | Keyphasor I/O Module |
| Barrier Type | Internal barriers |
| Termination | Internal terminations |
| Keyphasor Function | Shaft reference / rotational event detection |
| Compatible Signal Sources | Keyphasor proximity probes or magnetic pickups, subject to system configuration |
| Module Format | 3500 rack I/O module |
| Dimensions | Approx. 241.3 × 24.4 × 163.1 mm |
| Weight | Approx. 0.46 kg |
Bently Nevada’s 3500 documentation specifically lists 135473-01 as the 3500/25 I/O module with internal barriers and internal terminations. The documented physical dimensions for the internal-barrier I/O module are approximately 241.3 × 24.4 × 163.1 mm, with a weight of about 0.46 kg.
Product Introduction
The Bently Nevada 135473-01 is the I/O module associated with the 3500/25 Keyphasor function. It provides the field-side interface for Keyphasor signals while incorporating internal barriers and internal termination hardware, making it suitable for 3500 racks where intrinsically safe interface requirements are part of the installation.
Keyphasor information provides the rotational reference used by machinery-monitoring channels for speed, phase, and related timing measurements. The 3500/25 Enhanced Keyphasor architecture uses half-height two-channel Keyphasor cards, with the overall system capable of accepting up to four Keyphasor signals in normal configurations and more in paired arrangements.
135473-01
Application Scenarios & Field Pitfalls — Engineer’s Perspective
Engineering Pain Point
The common mistake with 135473-01 is treating it as a standalone vibration monitor. It is an I/O interface module, while the actual Keyphasor signal processing is performed by the associated 3500/25 Keyphasor module.
Typical Applications
- Steam and gas turbine monitoring — provides the rotational reference required by the 3500 machinery protection system.
- Compressor protection — supports shaft-speed and phase-reference measurements used by monitoring channels.
- Pump and rotating-equipment monitoring — interfaces Keyphasor signals into the 3500 rack.
- Hazardous-area installations — internal barriers provide the required interface arrangement where the system configuration calls for them.
Technical Pitfalls to Avoid
- Do not confuse 135473-01 with 135489-series monitor I/O.
The 135489 family is associated with 3500/42, /70 and /72 monitoring applications, while 135473-01 is specifically associated with the 3500/25 Keyphasor I/O position. - Internal barriers change the installation requirements.
Bently Nevada documentation states that an IS earthing module must be installed in each 3500 rack containing internal barriers. Do not substitute a standard Keyphasor I/O module without reviewing the rack’s hazardous-area design. - Check the complete 3500/25 configuration.
The ordering structure distinguishes the number of Keyphasor channels, I/O termination arrangement, barrier configuration, and agency approval. A 135473-01 should therefore be matched against the existing rack configuration rather than approved by part number alone.
Related Products
- Bently Nevada 149369-01 — Enhanced Keyphasor Module; the actual half-height processing module associated with the 3500/25 function.
- Bently Nevada 125800-01 — Keyphasor I/O module with internal terminations.
- Bently Nevada 126648-01 — Keyphasor I/O module with external terminations.
- Bently Nevada 125800-02 — isolated Keyphasor I/O module with internal terminations.
- Bently Nevada 126648-02 — isolated Keyphasor I/O module with external terminations.
- Bently Nevada 125792-01 — earlier Keyphasor module superseded by the Enhanced Keyphasor design.
- Bently Nevada 3500/25 — Enhanced Keyphasor system module.
- Bently Nevada 3500/04-01 — IS earthing module required for 3500 racks using internal barriers.
Procurement Check
For a replacement 135473-01, verify the existing 3500/25 configuration, number of Keyphasor channels, internal-barrier requirement, agency approval, rack hazardous-area classification, and associated 149369-01 or other Keyphasor module.
One important correction for procurement records: 135473-01 is not a 3500 power supply and is not a 3500/42 Proximitor/Seismic Monitor. The documented Bently Nevada designation is 3500/25 I/O Module with Internal Barriers and Internal Terminations.
