Product Overview

The Bently Nevada 330730-080-02-05 is a heavy-duty, high-integrity 3300 XL 11 mm Extension Cable engineered to function within critical Machinery Protection Systems (MPS) and continuous turbomachinery condition monitoring loops. The 3300 XL 11 mm transducer platform is specifically specified for industrial applications demanding an extended linear range beyond standard 8 mm options, providing a wide 4.0 mm (160 mils) linear tracking envelope. This extension cable serves as the vital, impedance-matched RF signal path linking an 11 mm proximity probe back to its corresponding 3300 XL Proximitor Sensor.

This specific physical configuration provides a total length of 8.0 meters (26.2 feet), constructed with a high-durability coaxial cable core enclosed within a flexible, interlocking stainless steel armored conduit wrapper. The terminations are executed via gold-plated brass miniature coaxial ClickLoc connectors, featuring a pre-installed connector protector sleeve to prevent mechanical uncoupling and fluid entry. Outfitted with the 05 Multiple Approvals specification, this extension cable fulfills global intrinsic safety (IS) and non-incendive engineering compliance rules, facilitating safe field integration across hazardous, explosive, or highly regulated production environments.

Technical Specifications

Model Configuration Explanation

The model alphanumeric code 330730-080-02-05 defines explicit physical layout parameters and hazardous zone certifications:

• 330730: Foundational base catalog number for the high-temperature 3300 XL 11 mm Proximity Extension Cable platform.
• 080: Cable Length Option. Designates exactly 8.0 meters of physical length. This length provides the necessary reach to route paths out of hot internal bearing housings into external field terminal plates.
• 02: Connector and Armor Option. Selects the premium interlocking stainless steel armored conduit cover over the FEP cable core, complemented by a factory-installed connector protector sleeve over the ClickLoc link.
• 05: Agency Approval Option. Multiple Approvals certification package. Combines North American CSA, European ATEX, and international IECEx intrinsic safety and non-incendive approvals for simplified site zoning compliance.

Typical Applications

The 330730-080-02-05 armored extension cable is critical for transmitting high-frequency displacement signals on large-scale rotating equipment where standard proximity sensor paths lack the required range or mechanical protection:

• Large Steam Turbines: Transmits dual-redundant axial thrust position data and differential expansion metrics, where large thermal growth patterns exceed the tracking capability of standard 8 mm sensors.
• Heavy Utility Gas Generators: Captures structural cross-axis radial shaft vibration and rotor position measurements inside hot, fluid-swept bearing enclosures.
• Hydroelectric Generator Units: Tracks low-frequency shaft runout and radial displacement on large-diameter vertical or horizontal shafts exposed to constant moisture.
• High-Capacity Centrifugal Compressors: Protects mega-watt gas transmission and downstream chemical compression trains from catastrophic internal axial rubbing events.

System Compatibility

To prevent phase inaccuracies and signal attenuation, the 330730-080-02-05 cable must be combined with matching 3300 XL 11 mm system hardware elements:

• Proximity Probes: Integrates with 3300 XL 11 mm Proximity Probes (such as the 330701, 330702, 330703, or 330704 series). Since the extension cable is 8.0 meters long, it must match with a 1.0-meter integrated probe lead to fulfill the 9.0-meter total system tuning standard.
• Proximitor Sensors: Links directly to a calibrated 3300 XL 11 mm Proximitor Sensor (Model 330780). It is completely incompatible with 3300 XL 5 mm or 8 mm Proximitor oscillators, which utilize distinct RF frequencies and a 200 mV/mil scale factor.
• Continuous Monitoring Monitors: Connects to the backplane input terminations of the Bently Nevada 3500/42M Proximitor Seismic Monitor module or distributed Orbit 60 protection architectures.

Hardware Integration & Routing Guidelines

• Verify Total System Length: Confirm that the combined length of the proximity probe cable and this extension cable matches the total length specified on the Proximitor Sensor faceplate (9.0 meters total).
• Connector Isolation Security: Ensure the ClickLoc connection remains clean and isolated inside the junction box. The included connector protector must be fully engaged; do not allow bare metal surfaces to ground out against metal enclosures.
• Avoid Sharp Conduit Angles: Observe the strict minimum bend radius of 25.4 mm (1.0 inch) for the armored conduit. Forcing tighter bends can distort the internal coaxial spacing, shifting characteristic impedance.
• Physical Separation from High-Voltage Lines: Route the low-voltage sensor extension cables through dedicated, grounded instrument conduits. Maintain a minimum separation of 300 mm (12 inches) from high-voltage AC motor lines or switching drives to prevent EMI noise.
• Conduit Moisture Drains: When routing cables from external casing points down to field boxes, install low-point conduit drains or drip loops to prevent water or condensation from collecting at the connector interface.

Product Advantages

• Extended Mechanical Tracking Range: Enables dependable tracking across a 4.0 mm linear profile, ideal for monitoring machines with high axial play or thermal expansion.
• Interlocking Stainless Armor: Heavy-duty metal armor wraps around the inner FEP cable, resisting physical cutting, crushing forces, and abrasion from hot process lubricants.
• Audible ClickLoc Engagement: Gold-plated mating connectors secure tightly with a push-and-twist motion, resisting vibration-induced uncoupling without specialized crimping tools.
• Global Intrinsic Safety Approval: The "05" code provides universal approval across ATEX, IECEx, and CSA frameworks, simplifying international procurement and site asset engineering.
• No Field Calibration Required: Precision-controlled characteristic capacitance and impedance enable direct drop-in replacement without re-tuning the monitoring rack.

Ordering Information

Logistics and Shipping

Professional Packaging Protocol:

Every Bently Nevada 330730 armored extension cable is sealed within an anti-static industrial packaging shield to safeguard the internal dielectric core against electrostatic discharge (ESD) hazards. The armored length is carefully coiled to eliminate twisting stresses, fixed with high-density retention bands, and packed within a vibration-dampening foam envelope inside a heavy-duty structural outer shipping box to guarantee damage-free international transit.

Frequently Asked Questions

• Can this 11 mm extension cable be matched with a standard 3300 XL 8 mm proximity probe?

  No. The 11 mm system works on a 75 Ω impedance loop and low-frequency RF tuning. Mixing it with 8 mm components ruins the scale factor calibration.

• What total loop system length does this 8.0-meter extension cable require?

  This 8.0-meter cable must pair with a 1.0-meter integrated probe cable. This creates the exact 9.0-meter total electrical length needed by the Proximitor.

• What does the "02" option code specify for this part number?

  The "02" code means the cable features a protective stainless steel armored conduit layer and a factory-installed clear connector protector sleeve.

• What output scale factor does this extension cable help provide?

  When integrated into a complete 3300 XL 11 mm system, it yields a nominal output scale factor of 3.94 V/mm (100 mV/mil) over a 4.0 mm range.

• How do you test for an internal short circuit in this cable using a multimeter?

  Disconnect both ends of the cable. Measure resistance between the center pin and the outer shell; it must show an infinite open circuit.

• Does the stainless steel armor make the cable completely rigid?

  No. The interlocking armor provides robust crush protection while remaining flexible enough to support a minimum installation bend radius of 25.4 mm.

• Can this cable be cut and shortened in the field to save space?

  Never shorten or splice this cable. Altering the factory-calibrated physical length changes the loop capacitance, invalidating monitor measurements.

• Is a special tool required to couple or uncouple the ClickLoc connectors?

  No tools are needed. ClickLoc interfaces utilize a manual push-and-turn mechanism that locks with an audible snap to prevent loosening from machine vibration.

• What specific hazardous zone classifications does the "05" approval cover?

  The "05" choice combines ATEX, IECEx, and CSA ratings for safe use in Zone 0, 1, and 2, as well as Class I, Division 1 and 2 areas.

• Why does the 11 mm system utilize a 100 mV/mil scale factor instead of 200 mV/mil?

  The lower scale factor allows the system to compress a wide 4.0 mm linear tracking range safely within the standard -24 Vdc monitor power limit.