• PN: 125800-01
• Brand: Bently Nevada (Baker Hughes)
• Series: 3500 Machinery Protection System
• Matching Main Board: 3500/25 Enhanced Keyphasor Module (149369-01)
• Type: Keyphasor I/O Internal Termination Module

• Function: Used as the rear terminal accessory of 3500/25 enhanced keyphasor module, receives two-way keyphase pulse signals from eddy current probes or magnetic speed sensors, completes field wiring access and signal transmission to the main control board, provides accurate rotational speed and phase reference signals for unit vibration analysis, shaft orbit detection and overspeed protection interlock.

• 
  

Core Features

1. Half-height dual-channel design, internal terminal wiring structure, no external terminal board required, simplifies cabinet wiring layout
2. Compatible with proximity transducer and magnetic pickup two types of speed sensors, wide input signal voltage range
3. Hot-swappable rack installation, supports TMR triple redundant safety configuration for critical units
4. Built-in overvoltage and surge protection circuit, effectively suppress industrial electromagnetic interference
5. High-precision signal acquisition, ensures phase measurement accuracy up to ±0.1° for rotating equipment fault diagnosis

6. Perfect backward compatibility, can directly replace old-version keyphase I/O termination modules

7. 
   

Technical Specs

• Channel: 2 independent keyphasor input channels
• Input signal range: +0.8V ~ -21V (non-isolated)
• Input impedance: ≥21.8kΩ
• Typical power consumption: 3.2W
• Operating temperature: -30℃ ~ +65℃
• Storage temperature: -40℃ ~ +85℃, 5%~95% RH non-condensing
• Dimension: 241.3 × 24.4 × 103.1mm
• Net weight: 0.46kg
• HS Code: 8537101190

• Certification: CE, UL certified

• 
  

Compatibility

• Applicable device: Standard 14-slot 3500 series monitoring rack
• Must match: 3500/25 main control module (PN:149369-01)
• Compatible sensors: 3300 XL series proximity probes, magnetic speed pickup sensors

• Not compatible: 3300 series rack, 3500/50 keyphasor module, third-party PLC/DCS backplane

• 
  

Application

• Rotational speed & phase signal collection for steam turbines, centrifugal compressors and generator sets
• Vibration spectrum analysis, shaft orbit monitoring and rotating equipment fault diagnosis
• Overspeed safety interlock signal acquisition for thermal power, petrochemical and metallurgy units

• Spare replacement and wiring renovation for aging 3500 TSI keyphase monitoring systems

• 
  

Our Advantage

• Continuity test, signal stability test and insulation withstand test completed before delivery
• 12-month warranty for new original and fully tested surplus modules
• Global DHL/Fedex door-to-door delivery
• Free technical support for sensor wiring, signal range debugging and keyphase parameter configuration