• PN: 135473-01
• Model: 3500/25 Isolated Keyphasor I/O Module
• Brand: Bently Nevada (Baker Hughes)
• Series: 3500 Machinery Protection System
• Matching Main Module: 3500/25 Enhanced Keyphasor Main Card
• Type: Isolated Internal Termination I/O Module with Intrinsic Safety Barrier

• Function: Receives rotational pulse signals from proximity probes or magnetic speed pickups, features electrical isolation and built-in safety barrier to connect field sensors in hazardous areas. Transmits stable keyphasor signals to the main module for rotational speed measurement, phase positioning, shaft orbit analysis and overspeed protection interlock of large rotating equipment.

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Core Features

1. Dual-channel isolated input design, effectively suppresses industrial common-mode interference and improves signal anti-interference ability
2. Integrated intrinsic safety barrier, applicable to explosive hazardous working conditions of petrochemical and oil & gas industries
3. Half-height hot-swappable structure, supports TMR triple redundant safety configuration for critical unit protection
4. Internal rear wiring terminal layout, simplifies cabinet wiring arrangement and reduces wiring failure risks
5. High-precision phase acquisition, phase measurement accuracy up to ±0.1% under stable operating speed

6. Built-in overvoltage and surge protection, prevents module damage caused by on-site grid voltage fluctuation

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Technical Specs

• Channel: 2 isolated keyphasor input channels
• Input signal source: Eddy current proximity probe, magnetic speed pickup
• Typical power consumption: 3.2W
• Operating temperature: -30℃ ~ +65℃
• Storage temperature: -40℃ ~ +85℃, 5%~95% RH non-condensing
• Dimension: 241.3 × 24.4 × 163.1mm
• Net weight: 0.46kg
• HS Code: 8537101190

• Certification: CE, UL certified

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Compatibility

• Applicable device: Standard 14-slot 3500 series monitoring rack
• Matching main board: 3500/25 enhanced keyphasor main module
• Compatible sensors: 3300 XL series proximity probes, magnetic rotational speed sensors

• Not compatible: 3300 series rack, 3500/50 keyphasor module, non-isolated keyphasor main boards

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Application

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

• Spare replacement and hazardous area monitoring system renovation for aging 3500 TSI equipment

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Our Advantage

• Continuity, insulation and intrinsic safety performance tests completed before delivery
• 12-month warranty for new original and fully tested surplus modules