Product Overview

• Brand: Bently Nevada (a GE Measurement & Control brand)
• Model: 128275-01
• Type: Proximity Probe Extension Cable / Sensor Cable Assembly
• Industry: Oil & gas, power generation, petrochemicals, and industrial manufacturing.
• Function: Extends the connection between Bently Nevada proximity probes (e.g., 3300 Series) and their signal conditioners (e.g., 3300/35 Monitoring System). Transmits high-fidelity vibration, position, or speed signals from rotating machinery (e.g., turbines, motors, pumps) to monitoring devices, ensuring accurate condition diagnostics.

Key Specifications

1. Electrical & Signal Parameters
   • Cable Type: Coaxial Cable (shielded) to minimize electromagnetic interference (EMI) and radio frequency interference (RFI) — critical for low-level sensor signals.
   • Impedance: 50 ohms (standard for Bently Nevada proximity probe systems, matching probe and conditioner impedance for signal integrity).
   • Signal Compatibility: Designed for eddy-current proximity probes (e.g., Bently 330101, 330102 series), supporting measurements of shaft vibration, axial position, and rotational speed.
   • Voltage Rating: 300V AC/DC (maximum, for safe operation in industrial environments).
2. Physical & Mechanical Attributes
   • Length: Common lengths include 10 feet (3.05 meters) and 20 feet (6.10 meters) (varies by order; check with distributors for exact length).
   • Conductors:
     • Center conductor: Stranded copper (for flexibility and durability).
     • Shielding: Braided copper shield (≥90% coverage) to block interference.
   • Jacket Material: PTFE (Polytetrafluoroethylene) or FEP (Fluorinated Ethylene Propylene) — both chemically resistant, high-temperature, and suitable for harsh industrial settings (e.g., exposure to oils, solvents, or extreme temperatures).
   • Connectors:
     • Probe-end: Bently Nevada proprietary connector (e.g., 10-32 UNF threaded connector, compatible with 3300 Series probes).
     • Conditioner-end: Matching connector for Bently signal conditioners (e.g., DIN-style or terminal block, depending on the monitoring system model).
3. Environmental Ratings
   • Operating Temperature: -55°C to +200°C (PTFE jacket) — withstands extreme heat in turbine enclosures or cold outdoor installations.
   • Ingress Protection (IP): IP65-rated (when mated with sealed connectors) — dust-tight and protected against water jets.
   • Chemical Resistance: Resistant to oils, fuels, hydraulic fluids, and most industrial chemicals (critical for petrochemical and offshore applications).

Applications

• Rotating Machinery Condition Monitoring:
  • Connects proximity probes to monitoring systems in gas turbines, steam turbines, and hydro turbines (power generation).
  • Transmits shaft vibration and position data for motors, pumps, and compressors (oil & gas, petrochemicals).
  • Enables predictive maintenance by ensuring reliable signal transmission for early fault detection (e.g., unbalance, misalignment, bearing wear).
• Industrial Asset Protection:
  • Integrates with Bently Nevada’s 3300/35, 3500, or 1701 Monitoring Systems to trigger alarms or shutdowns if machinery conditions exceed safe limits.

Availability and Support

• Condition: Available as new OEM (through GE Bently Nevada) or refurbished (via authorized distributors like AES Industrial, Hitech Control Systems, or Instrumentation2000).
• Warranty: 12-month warranty for new units (covers defects in materials/workmanship); refurbished units typically include a 6-month warranty.
• Documentation:
  • Datasheets and installation guides are available to GE Bently Nevada customers via their customer portal.
  • Third-party distributors may provide application notes or compatibility checklists upon request.

Compatibility and Similar Products

• Compatible Systems:
  • Bently Nevada 3300 Series Proximity Probes (e.g., 330101-00-05-10-02-00).
  • Bently Nevada Signal Conditioners/Monitors (e.g., 3300/35, 3500 Frame, 1701 System).
• Similar Bently Nevada Models:
  • 128275-02: Higher-length variant of the same extension cable (e.g., 30 feet).
  • 128276-01: Shielded twisted-pair cable for velocity or acceleration sensors (different signal type).

Installation and Maintenance Notes

1. Setup Requirements:
   • Ensure the cable length matches the system’s signal loss specifications (excessive length can degrade signal quality).
   • Use proper grounding for the cable shield (connect to the monitor’s ground terminal, not the probe’s) to avoid ground loops.
2. Safety Guidelines:
   • Follow lockout-tagout (LOTO) procedures when installing near rotating machinery.
   • Avoid bending the cable beyond its minimum bend radius (typically 25 mm for PTFE jackets) to prevent conductor damage.
3. Troubleshooting:
   • Check for shield damage or connector corrosion if signal quality degrades (common in harsh environments).
   • Use a multimeter to verify continuity between the center conductor and connectors (no continuity indicates a broken wire).

Critical Notes

1. Length Variability: The part number 128275-01 may correspond to specific lengths (e.g., 10ft). Confirm the exact length with the supplier before purchase, as it is not standardized across all distributors.
2. Connector Compatibility: Always match the cable’s connectors to the probe and monitor models — incorrect connectors can cause signal loss or equipment damage.
3. Genuine vs. Aftermarket: Use genuine Bently Nevada cables for critical applications (e.g., turbine control) to ensure compatibility and reliability; aftermarket cables may not meet EMI/RFI shielding requirements.