330930-045-08-05 4.5m FluidLoc Extension Cable

Introduction to the 330930-045-08-05 Extension Cable

When your rotating machinery monitoring system demands signal integrity, the 330930-045-08-05 from Bently Nevada delivers. This 3300 NSv extension cable is built to connect a 3300 NSv probe to its Proximitor Sensor, maintaining the precise gap and linear range needed for accurate vibration and position readings. With a 4.5-meter length (14.8 feet), it fits common machine train layouts while preserving signal quality.

Engineered for harsh industrial environments, this cable features FluidLoc construction with stainless steel armor. The armor provides mechanical protection without sacrificing flexibility, making it suitable for installations where cables may encounter abrasion or impact. The FEP insulation ensures stable electrical performance across a wide temperature range.

Key Features and Technical Specifications

Every specification of the 330930-045-08-05 is designed to support reliable proximity sensing. The table below summarizes the critical parameters:

• Cable Length: 4.5 meters (14.8 feet)
• Connector Option: FluidLoc cable with stainless steel armor, without FEP jacket
• Agency Approval: Multiple Approvals (option 05)
• Extension Cable Material: 75 Ω coaxial, fluoroethylene propylene (FEP) insulated
• Operating and Storage Temperature: -51°C to +177°C (-60°F to +351°F)
• Shipping Weight: 1.5 kg
• Center Conductor DC Resistance: 0.220 Ω/m (0.067 Ω/ft)
• Shield DC Resistance: 0.066 Ω/m (0.020 Ω/ft)
• Extension Cable Capacitance: 69.9 pF/m (21.3 pF/ft) typical

One distinctive aspect is the cable's low capacitance, which minimizes signal attenuation over the 4.5-meter run. This is crucial for maintaining the linear range of 1.5 mm (60 mils) and the recommended gap setting of 1.0 mm (40 mils). The DC resistance values ensure stable operation with the Proximitor Sensor's electronics.

Applications and Use Cases

The 330930-045-08-05 is ideal for turbomachinery, compressors, pumps, and other rotating equipment where precise shaft vibration and position monitoring are critical. In these applications, the extension cable must preserve the sensor's signal integrity over its length, and this cable does exactly that.

For example, in a steam turbine train, the probe is mounted near the bearing, while the Proximitor is located in a junction box several meters away. The 4.5-meter cable bridges that gap reliably. Its stainless steel armor protects against oil, moisture, and mechanical stress, which are common in such environments.

Additionally, the multiple approvals option (05) simplifies compliance for global installations, reducing the need for custom certifications.

Installation and Setup Guidance

Proper installation of the 330930-045-08-05 ensures accurate measurements. First, verify that the total length of the probe plus the extension cable equals the Proximitor Sensor's total length requirement. This is a critical rule for system calibration.

When routing the cable, avoid sharp bends that could damage the armor or the internal conductor. Use appropriate cable clamps to secure the cable and prevent strain on the connectors. The gold-plated brass connectors provide a reliable electrical connection, but they must be torqued to the manufacturer's specification to avoid intermittent signals.

For field wiring from the Proximitor to the monitor, use a three-conductor shielded triad cable with a cross-section of 0.2 to 1.5 mm² (16 to 24 AWG). The maximum recommended length is 305 meters (1,000 feet) to avoid high-frequency rolloff, as shown in the frequency response graphs in the datasheet.

Maintenance and Reliability

The 330930-045-08-05 is designed for long-term reliability, but periodic inspection is still recommended. Check the cable for cuts, kinks, or abrasion on the stainless steel armor. Inspect the connectors for corrosion or looseness, and verify that the cable is not exposed to temperatures beyond the rated range of -51°C to +177°C.

Because the cable is passive, it requires no routine maintenance beyond visual inspection. However, if the machine experiences high vibration, the cable may be subject to flexing; ensure it is properly secured to prevent fatigue. If any damage is found, replace the cable promptly to avoid signal degradation.

Compatibility and Integration

The 330930-045-08-05 is part of the Bently Nevada 3300 NSv system. It is designed to work with 3300 NSv Proximitor Sensors and 3300 NSv probes. The cable's 75 Ω impedance matches the system's requirements, ensuring consistent signal transmission.

For integration, the cable connects directly to the probe and the Proximitor. No special tools are required beyond standard connector wrenches. The cable's length is fixed, so ensure your layout accommodates the 4.5-meter span. If you need a different length, Bently Nevada offers other options in the 3300 series.

Troubleshooting Common Issues

If you encounter signal problems, first check the cable connections. Loose connectors are a common cause of intermittent readings. Verify that the probe and extension cable lengths sum correctly to the Proximitor's total length; an incorrect total can shift the linear range and cause erroneous voltage outputs.

Another issue is excessive cable capacitance, which can attenuate high-frequency signals. The 330930-045-08-05's low capacitance (69.9 pF/m) minimizes this risk, but if you use longer field wiring, consult the frequency response graphs to ensure your signal bandwidth is adequate.

If the cable is damaged, replace it with an identical part to maintain system accuracy. Do not attempt to repair the coaxial cable, as this can alter its electrical characteristics.

Product Support and Availability

The 330930-045-08-05 is available through AutoDCSTech. Contact our team to confirm current stock and lead times. We are an industrial automation parts supplier dedicated to helping you maintain your machinery monitoring systems.