Product Overview

The Bently Nevada 330704-010-060-10-11-00 belongs to the industry-standard 3300 XL 11 mm Proximity Transducer System. Engineered for critical machinery protection and condition monitoring, this non-contacting eddy current sensor measures static (gap) and dynamic (vibration) displacements. It is specifically designed for demanding turbomachinery environments where a standard 8 mm probe cannot provide the required linear range or where a larger physical clearance is necessary.

Operating on eddy current principles, the 11 mm probe provides a wider linear range of 4.0 mm (160 mils) compared to standard 8 mm variants. This makes it ideal for thrust position measurements in heavy industrial machinery, fluid-film bearing monitoring, and casing expansion analysis. The rugged design ensures complete physical and electrical interchangeability with older 7200-series 11 mm / 14 mm systems, allowing for seamless upgrades without modifying existing mechanical housings.

Technical Specifications

The following matrix outlines the rigorous physical, electrical, and environmental metrics defined by Bently Nevada for this specific probe asset:

Model Configuration Explanation

The part number 330704-010-060-10-11-00 represents a highly specified build structure. Each breakdown code indicates structural parameters essential to mechanical fitment:

330704 — Base Product Code

Specifies a standard 3300 XL 11 mm Proximity Probe with 5/8-18 UNF English threads, built for industrial machinery casing interfaces.

-010 — Unthreaded Length Option

Indicates an unthreaded length of 1.0 inch. This portion of the probe case is smooth to allow smooth insertion through a mounting bracket or sleeve without thread binding.

-060 — Overall Case Length Option

Specifies a total case length of 6.0 inches. This defines the structural body length needed to span the gap between the external mounting bracket and the internal observed shaft surface.

-10 — Total Length Option

Represents a total length of 1.0 meter (approx. 3.3 feet) for the integrated cable assembly measured from probe tip to the end of the miniature coaxial connector.

-11 — Connector and Cable Option

Specifies that the cable is supplied with standard fluid-resistant miniature coaxial connectors, complemented by integrated coaxial cable armor (flexible stainless steel conduit) to protect against mechanical abrasions and fluid ingress.

-00 — Agency Approval Option

Indicates a standard, non-certified option or standard multi-agency approval configurations that include ordinary safe-area designations or universal baseline certifications depending on factory marking lots.

Model Configuration Tree

For engineering validation, use this structured logic breakdown for the 330704 series:

330704 - [AAA] - [BBB] - [CC] - [DD] - [EE]
          |       |       |      |      |
          |       |       |      |      +-- Agency Approvals (00 = Standard/None)
          |       |       |      +--------- Connector & Cable Options (11 = Armor, w/ Connectors)
          |       |       +---------------- Total Length Option (10 = 1.0 meter)
          |       +------------------------ Overall Case Length (060 = 6.0 inches)
          +-------------------------------- Unthreaded Length (010 = 1.0 inch)

Typical Applications

The physical robustness and expanded linear performance profile of this 11 mm asset adapt it perfectly for several vital machinery arrangements:

• Steam and Gas Turbines: Radial vibration monitoring and axial shaft thrust alignment verification on utility-scale power generation trains.

• Centrifugal Compressors: Continuous monitoring of high-speed shafts operating within high-pressure hydrocarbon processing plants.

• Large Boiler Feed Pumps: Casing expansion monitoring and shaft relative position identification under wide operational temperature transients.

• Gearbox High-Speed Shafts: Backlash identification and gear mesh alignment tracking inside heavy industrial transfer gear systems.

• Hydroelectric Generators: Vertical structural shaft runout tracking and air-gap stability inspections.

System Compatibility

The 330704-010-060-10-11-00 probe functions as one component within a complete three-part measurement circuit. Full performance parameters require matching with:

• 3300 XL 11 mm Proximitor Sensor (P/N 330780): Provides the RF excitation signal and decodes the modulation into an analog voltage output.

• 3300 XL 11 mm Extension Cable: Used to bridge the physical gap when matching system lengths (typically a total length of 5.0m or 9.0m systems).

• Monitoring Platforms: Direct analog connection compatibility with Bently Nevada 3500/42M Proximitor Seismic Monitors, 3500/40M Thrust Position Monitors, or Orbit 60 systems.

Technical Compatibility Note: While backward-compatible with older 7200-series 11mm/14mm systems, mixing components from different series affects system calibration. Always calibrate your Proximitor sensor for the exact cable and probe length combination in use.

Installation Guidelines

• Verify Thread Clearance: Ensure the internal thread housing matches the 5/8-18 UNF specification. Clean any residual oil or anti-seize compound from the mounting tap before probe installation.

• Calculate Dynamic Mechanical Gap: Use a calibrated voltmeter to measure the Proximitor output voltage during mechanical adjustment. Adjust the probe gap until the voltage reads the target baseline (typically -10.0 VDC for a centered 11 mm system).

• Observe Torque Limits: Avoid over-tightening. The maximum recommended installation torque for the 5/8-18 UNF steel body probe into standard steel structures is 27 N·m (240 in·lb).

• Isolate Coaxial Connections: Use specialized silicone self-fusing tape or Bently Nevada connector protection kits at the connection between the probe cable and the extension cable to avoid electrical grounding or fluid contamination.

• Maintain Bending Radius: Avoid tight bends in the armored cable. The minimum bend radius for the flexible armored cable option is 25.4 mm (1.0 inch) to prevent damage to the inner conductor.

Product Advantages

• Extended Linear Measurement Range: Offers 4.0 mm of linear tracking, which is double the distance capability of an 8 mm system.

• High Signal-to-Noise Ratio: Excellent signal resolution over long distances, making it ideal for large utility machinery installations.

• Enhanced Mechanical Shielding: The stainless steel armor jacket prevents physical abrasion, cuts, and pinching in harsh industrial environments.

• Temperature Stability: Minimal drift across a wide temperature range (-51°C to +177°C) ensures stable performance during thermal transients.

• Click-Loc Coaxial Connections: The gold-plated connectors prevent accidental loosening caused by machine vibration, ensuring reliable signal transmission.

Ordering Information

Logistics and Shipping

To protect these precision components during transit, all shipments follow strict industrial packaging standards:

• Anti-Static Industrial Packaging: Probes are wrapped in electro-static discharge (ESD) shielding bags to protect the internal electrical components from static buildup during handling.

• Impact-Resistant Enclosures: Heavy-duty, dual-wall corrugated shipping cartons with custom foam inserts prevent deformation of the 11 mm probe tip or twisting of the armored cable conduit.

• Global Traceability: Each package includes clear labeling showing the serial number, part number, configuration breakdown, and full commercial documentation for fast customs clearance.

Frequently Asked Questions

• What is the core difference between an 8 mm probe and this 11 mm probe?

  The 11 mm probe provides a larger linear range of 4.0 mm (160 mils), whereas a standard 8 mm probe only supports 2.0 mm (80 mils). This makes it ideal for machines with significant axial movement.

• Can I connect this probe directly to a 3500/42M monitor without an intermediate transmitter?

  No. The proximity probe requires an intermediate 3300 XL 11 mm Proximitor Sensor to convert eddy current variations into a calibrated voltage signal before connecting to the monitor.

• What does the "-11" option mean for this model configuration?

  The -11 option means the probe comes equipped with a flexible stainless steel armor conduit over the cable, complete with standard miniature coaxial connectors.

• What is the correct installation torque for this 5/8-18 UNF probe?

  The maximum recommended torque is 27 N·m (240 in·lb) to prevent structural damage to the threaded body.

• Is this probe compatible with older 7200-series 11 mm installations?

  Yes, the 3300 XL 11 mm probe is physically compatible and can replace 7200-series components. However, you must ensure the Proximitor sensor matches the system type for accurate calibration.

• How does fluid ingress affect the click-loc connector?

  Fluid ingress can shift the electrical impedance and disrupt the calibration. Using the armored option with connector insulation sleeves helps protect against oil or water contamination.

• Can this proximity probe be shortened or cut in the field if it is too long?

  No. The cable length is an integral part of the tuned RF circuit. Cutting or altering the cable will invalidate the factory calibration and cause measurement errors.

• What is the target material used for standard factory calibration?

  Bently Nevada calibrates the 3300 XL 11 mm system using AISI 4140 steel as the default target material. Other materials will require custom recalibration factors.