Bently Nevada 330930-045-01-CN 3300 NSv Extension Cable

Bently Nevada 330930-045-01-CN 3300 NSv Extension Cable

Product Introduction

The Bently Nevada 330930-045-01-CN is a high-quality 3300 NSv extension cable engineered specifically for the 3300 NSv proximity probe system. This 4.5-meter (14.8 feet) cable connects the probe to the Proximitor Sensor, enabling accurate machinery condition monitoring. It comes with the 01 connector and cable option, which includes stainless steel armor with an FEP outer jacket for superior mechanical protection. Additionally, this model carries the CN agency approval option, signifying country-specific certifications. The 3300 NSv system is widely recognized for its precision in measuring vibration, thrust position, and eccentricity in critical rotating machinery.

Technical Specifications

The 3300 NSv Extension Cable delivers consistent electrical performance across its 4.5-meter length. The extension cable capacitance is typically 69.9 pF/m (21.3 pF/ft), ensuring minimal signal degradation. The DC resistance of the center conductor measures 0.220 Ω/m (0.067 Ω/ft), while the shield resistance is 0.066 Ω/m (0.020 Ω/ft). These low-resistance values contribute to accurate signal transmission over the cable's full length.

The cable construction features a 75 Ω coaxial design with fluoroethylene propylene (FEP) insulation. This material provides excellent dielectric strength and resistance to harsh chemicals and high temperatures. Moreover, the connectors are made of gold-plated brass, offering corrosion resistance and reliable electrical contact. The 3300 NSv system utilizes the same connector family as the 3300 XL series, ensuring compatibility across Bently Nevada product lines.

For field wiring, the 330930-045-01-CN supports conductors from 0.2 to 1.5 mm² (16 to 24 AWG), or 0.25 to 0.75 mm² (18 to 23 AWG) when using ferrules. Bently Nevada recommends a three-conductor shielded triad cable for optimal noise immunity. The maximum distance between the 3300 NSv Proximitor Sensor and the monitor is 305 meters (1,000 feet). However, users should consult the frequency response graphs (Figure 16 and Figure 17) to understand signal rolloff effects when using longer field wiring lengths.

Mechanical and Environmental Parameters

This model features the armored cable option (01) with stainless steel armor and an FEP outer jacket. The armor is constructed from flexible AISI 302 SST, providing excellent protection against physical damage, abrasion, and crushing forces. The FEP outer jacket adds an extra layer of chemical resistance and protects the armor from corrosion. This combination makes the 330930-045-01-CN particularly suitable for installations in harsh environments where cables may be exposed to mechanical stress or aggressive substances.

The operating and storage temperature range for this extension cable is -51°C to +177°C (-60°F to +351°F). This wide thermal tolerance allows reliable performance in extreme conditions, from cold start-ups to high-temperature turbine casings. The tensile strength is rated at 220 N (50 lb) across all connection points, including probe case to probe lead, probe lead to extension cable connectors, and probe case to stainless steel armor. This consistent rating ensures robust mechanical durability throughout the system.

The shipping weight of 1.50 kg reflects the armored construction. Users should account for this weight when planning cable support and routing, particularly in applications with long vertical runs or high vibration levels.

System Length Considerations

A critical aspect of installing the 330930-045-01-CN is ensuring the total system length matches the Proximitor Sensor's calibrated length. The sum of the probe length and the extension cable length must equal the Proximitor Sensor's specified total length. For example, if using a 0.5-meter probe with this 4.5-meter extension cable, the total system length becomes 5.0 meters. This matching requirement is essential for maintaining the sensor's calibrated scale factor and linear range accuracy.

Bently Nevada offers probes in various lengths (typically 1.0, 5.0, and 9.0 meters) to accommodate different total system configurations. Users should verify their Proximitor Sensor's total length rating before selecting the extension cable length.

System Performance Characteristics

When paired with the 3300 NSv Proximitor Sensor, this extension cable supports a linear range of 1.5 mm (60 mils). The linear region begins at approximately 0.25 mm (10 mils) from the target and extends from 0.25 to 1.75 mm (10 to 70 mils), corresponding to output voltages from -1 to -13 Vdc. This range is specifically optimized for the 3300 NSv system's measurement requirements.

The recommended gap setting is 1.0 mm (40 mils), which centers the probe within the linear range for optimal measurement accuracy. This gap setting is smaller than that of the 3300 XL system, reflecting the NSv's higher sensitivity and shorter measurement range. The system is factory calibrated to AISI 4140 steel as the reference target material. Calibration for other target materials is available upon request.

Installation Guidelines

Proper installation of the 330930-045-01-CN requires attention to several key factors. First, verify that the total system length matches the Proximitor Sensor's requirement. The probe length plus the extension cable length must equal the specified total length. Second, inspect the gold-plated brass connectors for cleanliness before mating. Any contamination can affect signal quality and measurement accuracy.

Third, route the armored cable with care, avoiding sharp bends that could exceed the armor's minimum bend radius. The flexible AISI 302 SST armor provides excellent protection, but excessive bending may compromise its integrity. Fourth, secure the cable using appropriate clamps or ties, ensuring it does not vibrate against machine surfaces. The 220 N tensile strength rating provides a generous safety margin for cable support.

Finally, set the probe gap to 1.0 mm (40 mils) using a proper gap measurement tool or voltage reading. The recommended gap positions the probe at the center of its linear range, ensuring optimal measurement accuracy and dynamic response.

Packaging List

• Bently Nevada 330930-045-01-CN 3300 NSv Extension Cable (4.5 meters, armored with FEP jacket)

• Installation instruction sheet

• Anti-static packaging bag

Shipping Information

All orders are shipped via FedEx, UPS, or DHL with full tracking capabilities. Standard packaging ensures the product arrives in perfect condition, ready for immediate installation.

Frequently Asked Questions

1. What is the difference between the 3300 NSv and 3300 XL extension cables?
The 3300 NSv system is designed for higher sensitivity and shorter measurement ranges (1.5 mm linear range) compared to the 3300 XL (4.0 mm linear range). The NSv extension cables are typically used with NSv probes and Proximitor Sensors, and the cable construction may differ in impedance characteristics.

2. Why must the probe length plus extension cable length equal the Proximitor Sensor total length?
The Proximitor Sensor is factory-calibrated to a specific total system length. Any deviation from this total length affects the scale factor and linearity of the measurement. Matching the total length ensures accuracy and interchangeability.

3. Can I use this extension cable with a 3300 XL probe?
While the connectors may be compatible, the 3300 NSv and 3300 XL systems have different impedance and calibration characteristics. Bently Nevada recommends using extension cables specifically matched to their respective probe systems for optimal performance.

4. Is the FEP jacket on the armor resistant to turbine oil?
Yes, the FEP (fluoroethylene propylene) outer jacket provides excellent resistance to turbine oil, hydraulic fluids, and many other industrial chemicals. This makes the armored cable suitable for use in oil-laden environments.

5. How do I verify the correct gap setting for my application?
The recommended gap setting is 1.0 mm (40 mils). This should be verified using a gap measurement tool or by monitoring the output voltage, which should be approximately -7 Vdc at the recommended gap (mid-range of the -1 to -13 Vdc linear output).