Product Overview

• PN: 330876-03-50-00-00
• Brand: Bently Nevada (Baker Hughes)
• Series: 3300XL Non-Contact Proximity Transducer System
• Type: 50mm Measuring Range Side Exit Probe

• Function: Non-contact eddy current sensor with maximum 50mm linear measurement range, specially designed to detect rotor differential expansion of large steam turbine units. It converts metal target displacement into analog voltage signal, transmits signal via matched extension cable to Proximitor signal converter, then connects to 3500/42M monitor module for real-time displacement monitoring, alarm interlock and equipment protection

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Model Suffix Explanation

• 330876：50mm range probe base model
• -03：1.99 inch smooth housing, side cable exit structure
• -50：Integrated cable length 5 meters
• -00：FluidLoc high temperature special cable

• -00：No extra explosion-proof certification

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Core Features

• 50mm ultra-wide linear measurement range, ideal for turbine rotor expansion monitoring
• Side outlet design, fits narrow installation space inside equipment casings
• 304 stainless steel probe housing, high mechanical strength and corrosion resistance
• High temperature resistant cable, long-term stable operation at -35℃~+200℃, transient peak 250℃ within 24h
• Built-in double-end sealing structure, dustproof and waterproof, adapt to humid and oily industrial environment
• Standard 75Ω triaxial cable, stable signal transmission with strong anti-electromagnetic interference

• Two rear 1/4-20 threaded holes for fixed mounting, convenient on-site installation and positioning

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Technical Specifications

• Effective Linear Range: 0~50 mm
• Probe Housing Diameter: 1.99 inch (50mm)
• Cable Total Length: 5 m
• Operating Temperature: -35℃ ~ +200℃
• Short-term Temperature Resistance: Max 250℃ (≤24 hours)
• Cable Impedance: 75Ω triaxial shielding cable
• Probe Resistance: 7.6Ω ±0.8Ω
• Minimum Bend Radius: 25 mm
• Net Weight: 0.323 kg
• HS Code: 85437090
• Certifications: CE

• Product Status: OEM discontinued; brand new original sealed and fully inspected refurbished probes available

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Compatibility

• Matched Accessories: Corresponding 3300XL 50mm Proximitor oscillator, dedicated extension cable
• Compatible Monitoring Module: 3500/42M, 3500/44M intrinsic safety monitor card
• Applicable System: Full set 3500 TSI turbomachinery protection rack system

• Measured Object: Rotor and casing metal target of steam turbine generator set

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Application

• Differential expansion & rotor elongation monitoring for large steam turbine units in thermal power plants
• Axial displacement and shaft position detection for heavy-duty compressors and large rotating machinery
• Retrofit replacement and spare part stocking for legacy 7200 series old monitoring systems