Bently Nevada 27490-1040-01 Radiation Resistant Extension Cable

Product Overview

The Bently Nevada 27490-1040-01 is a specialized 0.300-inch radiation-resistant extension cable for critical rotating machinery. Engineers deploy the 27490 Series to connect XL Radiation Resistant Proximity Probes to Proximitor Sensors inside gamma-radiation zones.

This specific assembly spans 104.0 feet (31.70 meters) and integrates flexible stainless steel armor with a Tefzel outer jacket. It prevents signal degradation, chemical corrosion, and radiation embrittlement in nuclear power plants and extreme industrial environments.

Ordering Configuration Breakdown

• Base Series (27490): 0.300-inch Radiation Resistant Extension Cable Family
  • Cable Length Option (1040): Exact total span of 104.0 feet (31.70 meters)
  • Armor Option (01): Equipped with flexible stainless steel armor and a Tefzel outer jacket

Technical Specifications

Installation Guidelines

• Connector Mating: Hand-tighten the gold-plated brass connectors to establish solid shield contact and prevent pin damage.
• Field Wiring Selection: Route 0.2 to 1.5 mm² (16 to 24 AWG) 3-conductor shielded triaxial cable between the Proximitor sensor and monitor.
• Cable Routing: Secure the armored jacket with industrial clamps and respect minimum bend radii to avoid conductor stress.
• Length Preservation: Never cut or splice the 27490-1040-01 in the field, as altering length ruins system capacitance calibration.

Commissioning and Maintenance

• Zero-Gap Verification: Measure DC gap voltage at the Proximitor output using a high-impedance multimeter during startup.
• Loop Resistance Checks: Test center and shield DC resistance values against nominal specs to detect loose connections early.
• Connector Inspection: Clean gold-plated brass threads before mating to eliminate particulate contamination and signal noise.

System Compatibility and Compliance

• Sensor Compatibility: Engineered exclusively for Bently Nevada XL Radiation Resistant Proximity Probes and XL Proximitor Sensors.
• Quality Assurance: Manufactured to strict Bently Nevada industrial quality standards for continuous gamma-radiation service.

Package Contents

• One factory-terminated Bently Nevada 27490-1040-01 Armored Extension Cable (104.0 ft)
• Protective connector dust caps and factory test documentation

Model Selection Comparison & Engineering Advice

Technical Selection Advice: Match the extension cable length strictly to your calibrated Proximitor system length. Choose the 27490-1040-01 when you must locate the Proximitor sensor far outside high-radiation or high-heat zones. Select the 27490-0090-01 for compact local junction box installations to eliminate excess coiled cable.

Frequently Asked Questions (FAQ)

• Q: How do I prevent ground loops when wiring this long extension cable?

  A: Ground the 3-conductor shielded triaxial field wiring strictly at the monitor end to eliminate common-mode noise.

• Q: Does the 104-foot cable length affect high-frequency vibration readings?

  A: The extension cable matches the calibrated system, but long field wiring beyond the Proximitor causes high-frequency signal roll-off.

• Q: Why is Tefzel used over standard PVC jackets in radiation environments?

  A: Standard PVC cracks and turns brittle under gamma radiation, whereas Tefzel resists radiation, acids, and industrial solvents.

• Q: Can I coil excess cable inside the junction box if 104 feet is slightly too long?

  A: Yes, coil excess armored cable loosely above the minimum bend radius without kinking or cutting the conductors.

• Q: How do I select between armored (-01) and unarmored (-00) options?

  A: Always specify the -01 armored option when routing cables through open trays, vibrating machinery frames, or washdown areas.

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