Bently Nevada 3500/25 149369-01 135473-01 Enhanced Keyphasor Module In stock

The BENTLY NEVADA 3500/25 Enhanced Keyphasor Module (149369-01) with I/O Module (135473-01) is a half-height, two-channel module that provides precise Keyphasor signals to monitor modules in a 3500 Machinery Protection System. The 149369-01 receives input signals from proximity probes or magnetic pickups and converts them into digital Keyphasor signals that indicate when the shaft’s Keyphasor mark aligns with the transducer. The 135473-01 I/O module includes internal barriers and internal terminations for safe hazardous area wiring. Together, they enable accurate speed measurement, vibration phase analysis (1X amplitude and phase), and system synchronization for critical rotating machinery protection.

Power Generation – Steam turbines, gas turbines, generators: Phase tracking during startup/coastdown, overspeed protection keyphasor input

Oil & Gas – Centrifugal and reciprocating compressors, LNG plants, refineries: Compressor surge boundary dynamic tuning, precise speed and phase reference

Petrochemical & Chemical Processing – Critical pumps, process motors: Vibration correlation and order tracking

Manufacturing – Steel mills, rolling mills: Main motor speed-phase closed-loop control

Offshore Platforms – Gas turbines, rotating equipment: 1X vibration analysis with vibration monitor cards

Marine Propulsion – Ships and offshore units: DNV GL and ABS certified for maritime applications

Mining – Heavy-duty rotating machinery requiring precise timing reference

TMR (Triple Modular Redundant) Systems – High-availability machinery protection requiring SIL2/SIL3 compliance

Internal Safety Barrier (135473-01) : I/O module includes internal barriers and internal terminations; eliminates need for separate external intrinsically safe barrier installation, reducing cabinet space and wiring costs

High-Precision Timing – 1 µs pulse resolution and ±0.01 RPM speed accuracy deliver laboratory-grade data for dynamic balancing, vector analysis, and startup/coastdown curves

Dual-Channel Architecture – Two independent channels per module for redundancy or multi-shaft applications; single module supports up to 2 channels, two modules support up to 4 channels

Multi-Event-per-Turn Processing – Converts high-frequency multi-event-per-revolution inputs (up to 20 kHz) into once-per-turn event signals for precise timing measurement

Field-Upgradeable Firmware – Allows software updates without replacing hardware, extending module life and functionality

Backward Compatibility – Complete form, fit, and function compatibility with legacy Keyphasor modules; direct replacement for PWA 125792-01

Configurable Signal Conditioning – User-selectable manual threshold (0 to -20 Vdc) and hysteresis (0.2 to 2.5 volts) for optimal trigger performance under varying signal conditions

Wide Speed and Frequency Range – Input supports 1 to 1,200,000 cpm (0.017 to 20 kHz); output 1 to 99,999 cpm

Dual Buffered Outputs – Keyphasor output signals available at both front coaxial connectors and rear Euro-style connectors

Hot-Swappable – Module can be replaced without powering down the rack (maintains <1 minute maintenance window)

Hazardous Area Approvals – ATEX/IECEx/CSA certifications for Class I, Zone 2 applications; with internal barriers enabled when using 135473-01 I/O module

Maritime Certifications – DNV GL and ABS approved for ships, offshore units, and high-speed craft

TMR-Ready Configuration – Can be paired with additional modules to build Triple Modular Redundant (TMR) keyphasor links meeting SIL2/SIL3 requirements

Keyphasor Signal Generation – Converts analog signals from proximity probes or magnetic pickups into precise digital Keyphasor pulses that indicate shaft rotational position reference

Speed Measurement – Accurate shaft rotational speed calculation across an extremely wide range (1 to 1,200,000 cpm), supporting both low-speed and ultra-high-speed rotating machinery

Phase Reference for Vibration Analysis – Provides once-per-revolution timing reference enabling 3500 monitor modules to calculate vector parameters, including 1X vibration amplitude and phase angle

Redundant Configuration Support – In TMR applications, two Keyphasor modules work in parallel to provide both primary and secondary Keyphasor signals; paired configurations support up to eight Keyphasor signals (four primary + four backup)

Synchronization of Monitoring Modules – Distributes synchronized timing signals to all monitor modules in the 3500 rack (e.g., 3500/40M, 3500/42M) for coherent data acquisition

Multi-Event-per-Turn Processing – Processes gear tooth or multiple-keyway inputs up to 20 kHz and outputs a clean once-per-turn signal for phase measurement

Signal Conditioning & Noise Filtering – Provides configurable triggering thresholds and hysteresis to reject electrical noise and ensure reliable pulse detection in electrically noisy industrial environments

Buffered Signal Distribution – Routes conditioned Keyphasor signals to front panel coaxial connectors for external diagnostic equipment (e.g., oscilloscopes, portable analyzers)

Self-Diagnostics – Monitors internal health and sensor integrity; reports faults via OK LED and communicates status to Rack Interface Module via TX/RX communication

System-Level Coordination – Communicates with the 3500 Rack Interface Module (RIM) to coordinate system-wide data acquisition and alarm management across all installed monitors

Q1: What is the difference between Bently Nevada 3500/25 149369-01 and the legacy 125792-01 Keyphasor module?

A1: The Bently Nevada 3500/25 149369-01 Enhanced Keyphasor Module is the direct functional replacement for the legacy 125792-01 module. The 149369-01 offers expanded signal processing capabilities, including multi-event-per-turn to once-per-turn conversion, field-upgradeable firmware, and improved asset management data reporting—while maintaining complete downward compatibility in form, fit, and function. You can install the 149369-01 directly into existing 3500 racks without any hardware modifications to replace a failed 125792-01 module.

Q2: Do I need external intrinsically safe (IS) barriers when using the 3500/25 135473-01 I/O module?

A2: No. The Bently Nevada 135473-01 I/O module is specifically designed with internal safety barriers and internal terminations built directly into the module. This eliminates the need for separate external intrinsically safe barrier cabinets, significantly reducing installation space, wiring complexity, and overall system cost. The 135473-01 is ideal for hazardous area installations (Class I, Zone 2 / Division 2) where intrinsically safe field wiring is required, and it maintains the necessary IS isolation for proximity probes and magnetic pickups.

Q3: Can I use the 3500/25 module with magnetic pickups for low-speed applications?

A3: Yes, but with important limitations. Passive magnetic pickups require a minimum shaft rotative speed greater than 200 rpm (3.3 Hz) to generate sufficient output voltage for reliable triggering. For low-speed applications below this threshold, the internal auto-threshold mode requires a minimum triggering amplitude of 2 V peak-to-peak and a minimum frequency of 120 rpm (2 Hz). If you must monitor speeds below 200 rpm, consider using the isolated I/O version (ordering options 04 or 05) or an active proximity probe system instead of a passive magnetic pickup. For speeds below 120 rpm, manual threshold configuration may be required—consult Bently Nevada application engineering for guidance.

Q4: How many Keyphasor signals can the 3500 system support with 3500/25 modules?

A4: The 3500 Machinery Protection System can accept up to four Keyphasor signals for standard configurations and up to eight Keyphasor signals when using a paired configuration. In a paired setup, four 3500/25 modules (each providing two channels) can be configured to accept four primary and four backup input signals, delivering four output channels (one per module). For Triple Modular Redundant (TMR) applications requiring system-level Keyphasor input, the 3500 system must employ two Keyphasor modules operating in parallel to provide both primary and secondary Keyphasor signals.

Q5: What is the temperature rating for the 3500/25 149369-01 with 135473-01 I/O module?

A5: When using the Bently Nevada 3500/25 149369-01 main module with the 135473-01 Internal Barrier I/O module, the operating temperature range is 0°C to +65°C (32°F to +149°F) . If you are using non-barrier I/O versions (such as 125800-01 or 126648-01), the operating temperature range expands to -30°C to +65°C (-22°F to +150°F) . The storage temperature for all versions is -40°C to +85°C (-40°F to +185°F) , and humidity tolerance is 95% non-condensing for all configurations. Always verify the I/O module type ordered when specifying temperature requirements for your installation environment.

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