Bently Nevada 330930-065-01-00 NSv Extension Cable

Product Introduction

The 330930-065-01-00 is a high-quality extension cable from Bently Nevada's 3300 NSv series. This cable serves as the critical link between the 3300 NSv proximity probe and the Proximitor Sensor, ensuring accurate signal transmission for vibration and position monitoring. Its 6.5-meter length provides flexibility in system layout, while the stainless steel armor offers superior protection against mechanical stress and harsh industrial environments. Additionally, the FEP jacket ensures excellent dielectric properties and resistance to chemicals and high temperatures. For these reasons, this extension cable is a reliable choice for safeguarding signal integrity in turbomachinery monitoring systems.

Technical Specifications

Cable Configuration
The 330930-065-01-00 model provides a specific length and armor configuration. The cable length option is 065, which equates to 6.5 metres (21.3 feet) . Furthermore, the connector and cable option is 01, indicating the inclusion of stainless steel armor with an FEP jacket. This armoring is critical for protecting the cable in high-wear or high-abrasion environments. The connector material is gold-plated brass, ensuring excellent electrical conductivity and corrosion resistance.

Electrical Properties
This extension cable features a 75 Ω coaxial design with fluoroethylene propylene (FEP) insulation. Its DC resistance specifications are well-defined: the center conductor measures 0.220 Ω/m (0.067 Ω/ft) , while the shield measures 0.066 Ω/m (0.020 Ω/ft) . Moreover, the typical capacitance is 69.9 pF/m (21.3 pF/ft) . These parameters are engineered to minimize signal degradation over the cable's length, preserving the accuracy of the measurement data.

Environmental and Material Limits
The 3300 NSv Extension Cable operates reliably across a wide temperature range. Its operating and storage temperature span is -52°C to +177°C (-62°F to +351°F) . The flexible armor, when specified, is constructed from AISI 302 SST, with or without an FEP outer jacket. The maximum rated tensile strength is 220 N (50 lb) , applying to the probe case-to-probe lead, the probe lead-to-extension cable connectors, and the probe case-to-armor connections.

System Integration and Compatibility

Length Calculation Requirement
A critical installation rule applies when using this extension cable. Specifically, the total length of the extension cable plus the probe length must equal the total length of the Proximitor Sensor. For the 330930-065-01-00, adding its 6.5 metres to the probe's length is mandatory for system calibration. Therefore, verify your probe's length carefully before finalizing your order to ensure compatibility.

Field Wiring Considerations
For field wiring between the Proximitor Sensor and the monitor, several parameters are important. The recommended conductor size is 0.2 to 1.5 mm² (16 to 24 AWG) , or 0.25 to 0.75 mm² (18 to 23 AWG) when using ferrules. A three-conductor shielded triad cable is strongly recommended for optimal noise rejection. The maximum allowable field wiring length is 305 meters (1,000 feet) , but users should consult the frequency response graphs for signal rolloff information at high frequencies when using longer runs.

Mechanical Performance

Tensile Strength and Durability
The 3300 NSv Extension Cable is built to endure significant mechanical forces. Its maximum rated tensile strength of 220 N (50 lb) applies uniformly across critical connection points. This robust rating ensures the cable maintains its integrity even under moderate pulling or tension during installation or operation. For this reason, it is well-suited for installations where cable routing may involve some physical stress.

Armor Protection
The stainless steel armor option (included in this model) provides an additional layer of defense. It effectively protects the inner coaxial conductor and FEP insulation from physical damage, such as crushing, abrasion, or cutting. This feature is especially valuable in retrofit applications or in areas with limited cable tray space where the cable may come into contact with sharp edges or heavy equipment.

Linear Range and Gap Setting

Measurement Range
The 3300 NSv system offers a linear range of 1.5 mm (60 mils) . This linear range begins at approximately 0.25 mm (10 mils) from the target and extends to 1.75 mm (10 to 70 mils) , which corresponds to an output voltage range of approximately -1 to -13 Vdc. This wide and linear range allows for accurate measurement across typical operating gaps.

Recommended Gap
For optimal performance, the recommended gap setting is 1.0 mm (40 mils) . Setting the gap at this value ensures the system operates within the most linear portion of its response curve. Consequently, this provides the most accurate and stable readings for vibration and position monitoring. Always set the initial gap according to this recommendation during the installation process.

Installation Guidelines

Step 1: Pre-Installation Check
Begin by inspecting the 330930-065-01-00 cable carefully. First, examine the connectors for any signs of corrosion or damage. Next, inspect the stainless steel armor and FEP jacket for any cuts, kinks, or abrasions. Finally, verify that the cable length matches your system's requirements.

Step 2: Length Verification
Before proceeding, calculate the total length. Add the probe length to the 6.5 metres of this extension cable. This sum must equal the Proximitor Sensor's total length. If the numbers do not match, the system will not be properly calibrated. Therefore, double-check all specifications.

Step 3: Connecting the Cable
Connect the extension cable securely to the probe and the Proximitor Sensor. Ensure the gold-plated brass connectors are fully mated and tightened properly. A loose connection can introduce noise or signal dropout, so apply the recommended torque to achieve a solid connection.

Step 4: Cable Routing
Route the armored cable to the sensor location. Avoid sharp bends and ensure the cable is secured with appropriate clamps or ties. Furthermore, keep the cable away from high-temperature surfaces, moving parts, and sources of strong electromagnetic interference. Proper routing will extend the cable's service life.

Packaging List

The standard shipment for this product includes:

1. 330930-065-01-00 Bently Nevada 3300 NSv Extension Cable (6.5 metres, 1 Unit)

2. Protective Caps for Connectors (Pre-installed)

Note: The shipment does not include any additional mounting hardware, adapters, or accessories beyond what is listed above.

Frequently Asked Questions (FAQ)

Q1: What is the purpose of the 330930-065-01-00 extension cable?
A1: This extension cable connects the 3300 NSv proximity probe to the Proximitor Sensor. It extends the system's reach while maintaining signal integrity for accurate vibration and position measurements.

Q2: What is the tensile strength rating for this 330930 cable?
A2: The maximum rated tensile strength for the 330930-065-01-00 is 220 N (50 lb) across all connection points. This includes the probe case-to-probe lead and the probe lead-to-extension cable connectors.

Q3: How do I determine if the cable length is correct for my system?
A3: Add the length of your probe to the 6.5 metres of this extension cable. This sum must equal the Proximitor Sensor's specified total length. This calculation is essential for proper system calibration.

Q4: What is the recommended gap setting for this 3300 NSv system?
A4: The recommended gap setting is 1.0 mm (40 mils) . This setting places the target within the most linear portion of the system's measurement range, which spans from 0.25 mm to 1.75 mm (10 to 70 mils).

Q5: Can I use field wiring longer than the extension cable with this system?
A5: Yes, you can use up to 305 meters (1,000 feet) of field wiring between the Proximitor Sensor and the monitor. However, you should review the frequency response graphs to understand signal rolloff at higher frequencies.