The Bently Nevada 3500/25-01-03-00 is an Enhanced Keyphasor Module designed for the 3500 Machinery Protection System. This half-height, two‑channel module processes signals from eddy‑current proximity probes or magnetic pickups, converting them into digital phase reference pulses. These pulses indicate precisely when a shaft's Keyphasor mark passes the transducer, providing the critical timing reference required for accurate vibration monitoring and shaft speed measurement .
This specific configuration –01‑03‑00 includes a single half‑height two‑channel Keyphasor card, an Internal Barrier I/O module with internal terminations for safe wiring in hazardous areas, and no external agency approvals . As an upgraded replacement for the legacy 125792‑01 module, it offers expanded processing capabilities while maintaining complete backward compatibility.
Item No :
3500/25-01-03-00Order(MOQ) :
1Payment :
EXWProduct Origin :
USAShipping Port :
Wuhan, Hubei, ChinaLead Time :
3-5 daysWeight :
1kgProduct Showroom
Bently Nevada 3500/25-01-03-00 Enhanced Keyphasor Module
Half‑Height, 2‑Channel Module for 3500 Machinery Protection Systems
New and Original
Half‑Height, 2‑Channel Design: Provides two independent channels for phase reference and speed processing while saving valuable rack space
Internal Barrier I/O Module: Integrated safety barriers simplify wiring for hazardous area transducers, eliminating the need for external isolators (‑03 option)
Precise Timing Signals: Delivers highly accurate Keyphasor pulses essential for machinery diagnostics, transient analysis, and vector parameter measurement (1X amplitude and phase)
Buffered Transducer Outputs: Front‑panel coaxial outputs allow convenient oscilloscope connection for maintenance and troubleshooting
Flexible Triggering: Supports both Auto Threshold (minimum 2 V peak‑to‑peak, ≥120 rpm) and Manual Threshold (user‑selectable from 0 to ‑20 VDC, minimum 500 mV peak‑to‑peak) with configurable hysteresis (0.2–2.5 V)
Wide Speed Range: Supports input frequencies from 1 rpm to 1,200,000 cpm (0.017 Hz to 20 kHz), accommodating diverse rotating machinery applications
Comprehensive Diagnostics: Front‑panel OK and TX/RX LEDs provide instant visual status indication
Multi‑Channel Configuration Support: 3500 system can accept up to 4 Keyphasor signals in normal configuration, or up to 8 signals in paired configuration
| Category | Specification |
|---|---|
| Manufacturer | Bently Nevada (GE) |
| Model Number | 3500/25-01-03-00 |
| Product Type | Enhanced Keyphasor Module |
| Series | 3500 Machinery Protection System |
| Channel Configuration | 01 = Single half‑height, 2‑channel card |
| I/O Module Type | 03 = Internal Barrier I/O with Internal Terminations |
| Agency Approval | 00 = Not required |
| Input Signal Types | Eddy‑current proximity probes, magnetic pickups |
| Input Impedance | 21.8 kΩ minimum |
| Input Signal Range | Non‑isolated: +0.8 V to ‑21.0 V (proximity probes) |
| Speed / Frequency Range | 1 to 1,200,000 cpm (0.017 Hz to 20 kHz) |
| Outputs | 2 buffered Keyphasor outputs (front coaxial & rear Euro‑style connectors) |
| Output Impedance | 504 Ω maximum |
| Transducer Power Supply | ‑24 VDC, 40 mA maximum per channel |
| Power Consumption | 3.2 W typical |
| Operating Temperature (with Internal Barrier) | 0°C to +65°C (32°F to +150°F) |
| Operating Temperature (other I/O) | ‑30°C to +65°C (‑22°F to +150°F) |
| Storage Temperature | ‑40°C to +85°C (‑40°F to +185°F) |
| Humidity | 95% non‑condensing |
| Dimensions (H x W x D) | 119.9 mm x 24.4 mm x 256.5 mm (4.72 in x 0.96 in x 10.10 in) |
| Weight | Approx. 0.34 kg (0.76 lbs) |
| Rack Space | 1 half‑height front slot |
| Country of Origin | USA |
| Suffix | Code | Meaning |
|---|---|---|
| ‑01 | — | Single half‑height 2‑channel Keyphasor card |
| ‑03 | — | Internal Barrier I/O with Internal Terminations (built‑in safety barriers) |
| ‑00 | — | No agency approvals required |
The Enhanced Keyphasor Module is fully backward‑compatible with existing 3500 systems and serves as a direct replacement for the legacy 125792‑01 Keyphasor module .
The half‑height main module requires a structural chassis divider or special mounting adapter when installed in full‑height slots
Each 3500 rack can accommodate a maximum of two main modules (one in a top half‑slot and one in a bottom half‑slot)
The Internal Barrier I/O configuration (‑03) includes built‑in safety barriers, allowing direct connection to transducers in hazardous areas without external isolators
Proper grounding of shield lines at designated terminal blocks is essential to mitigate high‑frequency interference on critical timing signals
For Triple Modular Redundant (TMR) applications, the 3500 system should employ two Keyphasor modules operating in parallel to provide both primary and secondary Keyphasor signals
The 3500/25 Keyphasor Module is essential for critical rotating machinery protection across multiple industries :
| Industry | Application |
|---|---|
| Power Generation | Turbine speed and phase tracking on steam and gas turbine generators |
| Oil & Gas | Compressor and expander protection systems in refineries and pipeline stations |
| Chemical Processing | Monitoring critical pumps and rotating equipment in hazardous areas |
| Heavy Industry | Predictive maintenance on fans, blowers, and mills |
Key Supported Machine Types:
Steam and Gas Turbines
Centrifugal Compressors
Pumps
Generators
Turbo‑expanders
| Detail | Information |
|---|---|
| Condition | New & Original |
| Stock Status | In Stock |
| Warranty | 12 Months |
| Shipping Port | Xiamen, China |
| Lead Time | 5‑7 Working Days |
| Payment Terms | T/T, Western Union |
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