Description
Bently‑Nevada 3500/25 135473‑01 Isolated Keyphasor I/O Module
Product Overview
135473‑01 is the isolated internal‑barrier I/O daughter board for 3500/25 Enhanced Keyphasor main board (main logic board PN:149369‑01)Moore Auto…. Complete assembly = 149369‑01(main board)+135473‑01(isolated I/O board). It provides galvanic isolation for field keyphasor sensors (proximity probe / magnetic pickup), for hazardous‑area wiring applications, internal termination design. It delivers once‑per‑turn timing reference, shaft speed and phase reference for 3500 machinery protection racks. Original OEM production discontinued, supplied as aftermarket spare for legacy turbine/compressor monitoring systems。
350025 135473‑01
Key Specifications
| Item | Parameter |
|---|---|
| Part Number | 135473‑01 (Isolated I/O Daughter Card for 3500/25) |
| Manufacturer | Bently‑Nevada (Baker Hughes) |
| Module Assembly | 3500/25‑01‑03‑00; Main logic board:149369‑01 + I/O board 135473‑01 |
| Channels | 2 isolated Keyphasor input channels |
| Isolation | 1500 V channel‑to‑backplane galvanic internal barrier isolation |
| Sensor Compatibility | Proximity probe, magnetic pickup (passive MPU), proximity transducer internal termination |
| Transducer Power | ‑24 VDC, max 40 mA per channel |
| Speed Measuring Range | 1 rpm‑25 000 rpm |
| Trigger & Hysteresis | User‑selectable threshold 0.2‑2.5 V |
| Buffered Output | Front‑panel BNC ×2, rear terminal buffered outputs, max output impedance 504 Ω |
| Power Consumption | 3.2 W typical (whole 3500/25 assembly) |
| Operating Temperature | 0 °C ~ +65 °C |
| Storage Temperature | ‑40 °C ~ +85 °C |
| Humidity | 5‑95 % RH non‑condensing |
| Weight(I/O board) | 0.46 kg |
| Termination | Internal termination (field wires connect directly to module rear Euro‑terminal) |
| Status | Discontinued original production, aftermarket spare‑part only |
Distinction vs non‑isolated version：
- 125792‑01: older non‑isolated main board + non‑isolated I/O board；
- 149369‑01+135473‑01: newer complete isolated assembly with internal safety barriers for hazardous‑area field wiring。
Main Applications
- Steam turbine, gas‑turbine, centrifugal compressor machinery‑protection rack (hazardous area field wiring)
- Petrochemical refinery, power‑plant rotating‑equipment condition & vibration monitoring
- Shaft rotating‑speed measurement, 1X‑phase calculation, rotor balancing, vector‑based fault diagnosis
- System‑1 software vibration post‑event analysis
- Retrofit & spare‑part replacement for legacy 3500 racks requiring isolated keyphasor inputs
Related Series Models
- 135473‑01 Isolated I/O daughter‑card (internal barrier, internal termination)
- 149369‑01 3500/25 main logic board (work with 135473‑01 to make full module)
- 125792‑01 Older non‑isolated complete 3500/25 assembly
- 125800‑02 Alternative isolated I/O variant
- 3500/40M Proximity / vibration monitor (consumes keyphasor timing reference)
- 3500/22M Transient data interface module
Core Features
- Internal‑barrier galvanic isolation:1500 V isolation between field‑sensor side and rack backplane side; suppress high‑common‑mode noise for hazardous‑area installations, reduces ground‑loop interference.
- Internal termination design: Field sensor wiring terminates directly to rear green Euro‑terminal; no external termination block required.
- Dual‑channel keyphasor signal conditioning: Support proximity probes and passive magnetic‑pickup sensors, configurable trigger‑level and hysteresis for noisy site pulse signals.
- Front‑panel BNC buffered outputs: Convenient connection for portable vibration analysers for on‑site balancing and troubleshooting.
- Full diagnostics: Detect transducer open‑circuit, short‑circuit and internal hardware fault; report fault status via rack RIM and front‑panel OK / TX‑RX LED indicators.
- Hot‑swap compatible: Half‑height module form‑factor, fits standard 3500 rack slots; backward‑compatible with existing 3500 system firmware.
Main Functions
- Accept raw pulse signals from shaft key‑phasor proximity probes / magnetic‑pickups, provide galvanic isolation, signal conditioning and threshold triggering.
- Generate once‑per‑turn timing reference and real‑time shaft‑speed value, distribute timing clock to all vibration‑monitor modules via rack backplane for phase‑locked 1X‑vibration amplitude & phase calculation.
- Provide buffered keyphasor pulses via front‑BNC and rear terminals for external diagnostic instruments.
- Continuously monitor transducer health and module hardware faults; send alarm & diagnostic status to RIM and host monitoring software.
- Support paired‑module mode: up to 8 keyphasor inputs for multi‑shaft complex machinery protection systems.
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