Bently Nevada 330854-080-25-05

Bently Nevada 330854-080-25-05

Product Overview: The 330854-080-25-05 is an extension cable within the Bently Nevada 3300 XL 25mm eddy current sensor system. The 3300 XL 25mm system is specifically designed for demanding differential expansion (DE) measurement applications in steam turbines, providing extended linear range and high-temperature capability. In the model number, “330854” designates the 3300 XL 25mm extension cable product base, “080” indicates a cable length of 8.0 meters, “25” denotes the 25mm probe system designation, and “05” indicates multi-agency approval (CSA NRTL/C, BASEEFA/CENELEC, CSA Division 2).

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Description

Bently Nevada 330854-080-25-05

Technical Specifications:

  • Cable Length: 8.0 meters
  • Cable Type: Standard cable for 25mm system
  • Probe System: 3300 XL 25mm
  • Connector Type: High-temperature ClickLoc connectors
  • Conductor Type: 75Ω triaxial coaxial structure
  • Insulation Material: FEP (Fluoroethylene Propylene)
  • Operating Temperature Range: -52°C to +200°C (continuous), +250°C (intermittent)
  • Minimum Bend Radius: 25.4mm (1 inch)
  • Certification: CSA NRTL/C, BASEEFA/CENELEC, CSA Division 2
  • Compliance Standard: API 670 (4th Edition)

Functional Features:

  • Designed specifically for the 3300 XL 25mm eddy current sensor system for differential expansion measurement
  • High-temperature capability supports continuous operation at 200°C and intermittent exposure to 250°C
  • Multi-agency certification supports hazardous area (Division 2) installations
  • 75Ω triaxial coaxial structure ensures impedance matching and signal transmission integrity
  • High-temperature ClickLoc connectors with connector protectors as standard
  • FluidLoc cable design prevents moisture ingress into the probe end
  • Fully interchangeable within the 3300 XL 25mm system
  • Backward compatible with 7200 25mm, 7200 35mm, and 25mm DE sensor systems

Application Scenarios:

  • Steam turbine differential expansion (DE) measurement
  • High-temperature turbine casing and rotor expansion monitoring
  • Power generation steam turbine condition monitoring
  • Applications requiring extended linear range for large axial displacement measurement
  • Hazardous area installations in power plants
  • International projects requiring CSA, ATEX, and IECEx certifications

Performance Parameters:

  • Cable Capacitance: 69.9 pF/m (21.3 pF/ft)
  • Output Impedance: 50Ω
  • Sensitivity Stability: Output changes less than 2mV per 1 volt change in input voltage
  • Frequency Response: 0 to 10kHz
  • Linear Range (with 25mm probe): Up to 25mm depending on probe configuration
  • Maximum Operating Temperature: 200°C continuous, 250°C intermittent

Material Composition:

  • Conductor: Copper core with braided shielding layer
  • Insulation Layer: FEP (Fluoroethylene Propylene) high-temperature grade
  • Connector: High-temperature ClickLoc connectors
  • Connector Protector: Environmental sealing cap (standard)
  • Outer Jacket: Heavy-duty industrial-grade polymer with FluidLoc sealing

Structural Characteristics: Coaxial cable with a triaxial structure designed for the 25mm probe system. The cable features high-temperature ClickLoc connectors with standard connector protectors and FluidLoc sealing to prevent moisture migration. The 8.0-meter length provides sufficient reach for typical steam turbine DE measurement installations where the Proximitor is mounted at a distance from the turbine casing.

Working Principle: The extension cable serves as the signal transmission bridge in the eddy current sensor system, transmitting the high-frequency signal generated by the probe tip coil to the Proximitor without loss through the coaxial structure. The outer shielding braid of the coaxial structure prevents external electromagnetic interference from intruding, while the inner signal line maintains constant impedance. Once the signal reaches the Proximitor, it undergoes amplification, demodulation, and linearization, ultimately outputting a DC voltage signal proportional to the distance between the probe tip and the target surface.

Installation Requirements:

  • Ensure the total length of the probe cable plus the extension cable matches the Proximitor system length configuration
  • Cable routing must maintain at least 30cm clearance from high-voltage power cables
  • Maintain a minimum bend radius of 25.4mm; prohibit excessive bending
  • High-temperature ClickLoc connectors are hand-tightened; do not use tools
  • The shielding layer must be grounded at a single point on the Proximitor end; prohibit multi-point grounding to prevent ground loops
  • Connector protectors must be installed after the final connection is completed to ensure sealing effectiveness
  • Hazardous area installations must comply with applicable explosion-proof regulations

Usage Notes:

  • The “25” code indicates the 25mm probe system; this cable is not interchangeable with 8mm or 11mm system cables
  • The “05” code indicates multi-agency certification; verify that the specific certifications meet site requirements before installation
  • Inspect connector condition and connector protector integrity at each maintenance interval
  • Never cut or splice the extension cable; any modification will destroy impedance matching
  • When upgrading from 7200 series 25mm systems, all components (probe, extension cable, and Proximitor) must be replaced with 3300 XL 25mm components simultaneously
  • Hazardous area installations must comply with applicable explosion-proof regulations

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