330930-065-01-05 6.5m Extension Cable | Bently Nevada

Case Study: Solving Vibration Monitoring Cable Failures

In a petrochemical plant, a 3300 NSv Proximitor system experienced intermittent signal loss. The root cause was a standard extension cable that could not withstand the plant's high temperatures and mechanical stress. The Bently Nevada 330930-065-01-05 solved this by providing a 6.5-meter (21.3 feet) extension cable with stainless steel armor and FEP jacket, ensuring signal integrity in harsh environments.

Product Overview: The 330930-065-01-05

Manufactured by Bently Nevada, the 330930-065-01-05 is a 3300 NSv extension cable designed for precision vibration monitoring. It connects a 3300 NSv Proximitor sensor to a probe, maintaining the required total length for accurate measurements. This cable is made in the U.S.A. and features a 75 Ω coaxial construction with fluoroethylene propylene (FEP) insulation, offering excellent thermal and electrical performance.

Key Features & Technical Specifications

• Cable Length: 6.5 meters (21.3 feet) – ensures proper total length with probe and Proximitor.
• Connector Option: Stainless steel armor with FEP jacket – provides mechanical protection and chemical resistance.
• Agency Approval: Multiple approvals – suitable for various industrial applications.
• Cable Material: 75 Ω coaxial, FEP insulated – maintains signal integrity over temperature extremes.
• Operating Temperature: -51°C to +177°C (-60°F to +351°F) – withstands harsh environments.
• DC Resistance: Center conductor 0.220 Ω/m, shield 0.066 Ω/m – low signal loss.
• Capacitance: 69.9 pF/m (21.3 pF/ft) typical – ensures consistent frequency response.
• Shipping Weight: 1.5 kg – lightweight for handling.

Industrial Applications

The 330930-065-01-05 is ideal for rotating machinery monitoring in industries such as oil & gas, power generation, and manufacturing. It is used with 3300 NSv Proximitor sensors to measure shaft vibration and position. The stainless steel armor protects against abrasion and impact, making it suitable for installations where cables are exposed to mechanical stress. Additionally, the FEP jacket resists chemicals and high temperatures, ensuring reliable operation in demanding process areas.

Installation & Setup

When installing the 330930-065-01-05, ensure that the extension cable length plus the probe length equals the Proximitor sensor total length. This is critical for accurate gap settings and linear range. The recommended gap setting is 1.0 mm (40 mils). Field wiring should use a three-conductor shielded triad cable with a maximum length of 305 meters (1,000 feet) between the Proximitor and the monitor. For high-frequency applications, refer to frequency response graphs to account for signal rolloff.

Maintenance & Reliability

Regularly inspect the cable for signs of wear, especially at connection points. The stainless steel armor provides excellent durability, but periodic checks ensure long-term reliability. Operating within the specified temperature range (-51°C to +177°C) prevents insulation degradation. Following the manufacturer's guidelines for routing and securing the cable minimizes stress and extends service life.

Compatibility & Integration

The 330930-065-01-05 is compatible with Bently Nevada 3300 NSv Proximitor systems. It is designed to work with 3300 NSv probes and Proximitors, ensuring seamless integration. The cable's 75 Ω impedance matches the system requirements, maintaining signal fidelity. For detailed compatibility, consult the official Bently Nevada documentation or contact AutoDCSTech.

Troubleshooting & Common Issues

If signal loss occurs, check the cable for damage or loose connections. Ensure the total length (probe + extension) matches the Proximitor specification. Verify that the cable is not routed near high-voltage sources or sharp edges. If the issue persists, test the cable's DC resistance and capacitance against the specified values to identify any degradation.

Product Support & Availability

The 330930-065-01-05 is available from AutoDCSTech. Contact us for current availability and lifecycle status. Our team can assist with technical questions and ordering.