Bently Nevada 3500/25 149369-01 Enhanced Keyphasor Module without I/O module

Product Overview
The Bently Nevada 3500/25 149369-01 is a factory-built Enhanced Keyphasor Module that supplies precise once-per-turn timing signals to the 3500 machinery protection system. Accepting inputs from eddy-current proximity probes or magnetic pickups, it generates ultra-stable TTL keyphasor pulses for phase, speed, and vector data used in advanced vibration diagnostics. Whether you are retrofitting a legacy 3500 frame or expanding a new steam-turbine train, the 149369-01 ensures OEM-grade accuracy and long-term reliability.

Key Features & Benefits
• Dual independent channels – supports redundant sensors for maximum uptime
• Configurable trigger level, hysteresis, and edge for each channel
• TTL/CMOS-compatible keyphasor output directly to 3500 rack backplane
• Auto-threshold or manual threshold adjustment via System 1 or Rack Configuration Software
• Hot-swappable without rack shutdown – reduces maintenance downtime
• CE, ATEX Zone 2 / IECEx certified for hazardous-area installations
• Backward-compatible with all 3500/05 racks (R6.0 firmware or later)

Typical Applications
• Steam, gas, and hydro turbine speed & phase reference
• Centrifugal and reciprocating compressor keyphasor timing
• Motor-driven pump train diagnostics and balancing
• API 670-compliant machinery protection systems

Technical Specifications
Channels: 2 fully isolated
Input Types: Eddy-current proximity probe or magnetic pickup
Input Impedance: 10 kΩ (proximity) / 50 kΩ (magnetic)
Frequency Range: 0.1 Hz to 20 kHz
Output: TTL/CMOS, 5 Vpp into 50 Ω
Front LEDs: Power, OK, Channel A/B Active
Power Consumption: 6 W max @ 24 V DC
Operating Temperature: –30 °C to +65 °C (–22 °F to +149 °F)
Dimensions: 241 mm × 24.4 mm × 241 mm (H × W × D, rack depth)
Weight: 0.7 kg (1.5 lb)

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