Product Overview

The Bently Nevada 330103-00-05-50-02-00 is an industry-standard 3300 XL 8 mm Proximity Probe utilizing metric threads (M10 x 1). It is engineered for continuous machinery protection systems (MPS) and critical turbomachinery condition monitoring. Operating on non-contacting eddy current principles, this probe delivers high-precision displacement data to track radial shaft vibration, axial thrust position, and speed/phase reference (Keyphasor) telemetry on high-speed rotating assets.

The 3300 XL 8 mm transducer system offers a dependable linear operating range of 2.0 mm (80 mils). It excels at maintaining an exceptionally flat thermal response across fluctuating internal machinery temperatures, providing excellent repeatability where minor deviations could trip a multi-megawatt asset. By minimizing thermal drift, this sensor helps prevent false trips while ensuring absolute machine protection.

This specific configuration features a metric M10 x 1 threaded body with a 0 mm unthreaded section (fully threaded), a 50 mm overall case length, a 0.5-meter (1.6 feet) integrated unarmored coaxial cable, and a gold-plated miniature coaxial ClickLoc connector. This tight physical footprint is optimized for low-clearance internal mounting where the proximity probe must be positioned entirely within internal bearing housings or compact bracket assemblies.

Technical Specifications

Model Configuration Explanation

The model string 330103-00-05-50-02-00 represents a precise selection from the Bently Nevada 3300 XL 8 mm metric catalog, mapping out the physical parameters required for exact mechanical field drop-ins:

• 330103: The foundational base model number for the 3300 XL 8 mm Proximity Probe configured with a metric thread profile (M10 x 1).
• 00: Unthreaded Length Option. Specifies 0 mm unthreaded sleeve behind the probe tip. The housing is fully threaded down to the tip transition, allowing total adjustability inside tight bracket spaces.
• 05: Overall Case Length Option. Designates a 50 mm total case length, providing a compact, low-profile body ideal for direct internal installation.
• 50: Total Length Option. Dictates a 0.5-meter (1.6 feet) integrated cable lead, which minimizes excess cable sloshing inside internal oil environments.
• 02: Connector and Cable Type Option. Selects a standard unarmored flexible coaxial cable terminated with a miniature coaxial ClickLoc connector. This configuration provides a tight bend radius for easier routing within internal bearing pathways.
• 00: Agency Approval Option. Standard non-certified/safe area option, providing an economical choice for machinery located outside of explosive or hazardous area zoning regulations.

Typical Applications

The 330103-00-05-50-02-00 proximity probe is critical for assessing machine health across continuous process industries, particularly where compact metric leads are routed inside internal machinery spaces:

• Radial Shaft Vibration: Installed in dual X-Y orthogonal arrangements on fluid-film (journal) bearings to map shaft dynamic behavior, centerline orbital profiles, and structural instabilities like oil whip or oil whirl.
• Axial Thrust Position: Deployed in dual-redundant configurations targeting shaft thrust collars to detect axial drift and prevent rotor-to-stator collisions within industrial steam turbines or turbo-compressors.
• Keyphasor Phase Reference: Monitors an intentional notch or keyway on the shaft to establish an accurate once-per-revolution phase mark, critical for tracking synchronous phase angles and variable machine RPM.
• Machinery Categories Covered: High-speed process pumps, small centrifugal compressors, gas turbine auxiliary gearboxes, process air blowers, and high-performance industrial fans.

System Compatibility

To satisfy rigorous API 670 operational design parameters, the 330103 proximity probe must be matched with its complementary signal conditioning components to complete the circuit loop:

• Extension Cable Selection: Must be paired with a 3300 XL 8 mm Extension Cable (such as the 330130 series). Because the integrated probe cable length is 0.5 meters, it must be paired with either a 4.5-meter or 8.5-meter extension cable to establish a true 5.0-meter or 9.0-meter total system tuning loop.
• Proximitor Sensor Integration: Connects directly into a matching 3300 XL Proximitor Sensor (Model 330180). The Proximitor supplies the radio frequency (RF) excitation to the probe tip and translates the return eddy current impedance changes into a linear -24 Vdc voltage representation.
• Protection Monitors: Links via terminal blocks directly to the backplane inputs of the Bently Nevada 3500/42M Proximitor Seismic Monitor module, the 3500/25 Keyphasor card, or legacy standalone 3300 vibration controllers.

Mechanical Alignment and Adjustment Guidelines

• Shaft Surface Treatment: Ensure the shaft measurement path is completely free of grinding patterns, score marks, or metallurgic variations. A surface finish of 0.8 micrometers (32 microinches) Ra or better prevents artificial electrical runout signals.
• Setting the Operating Gap: Thread the probe into its mounting bracket while checking the DC bias voltage at the Proximitor Sensor's terminal strip or buffered output port. Turn the body until the meter shows -10.0 Vdc, marking the precise midpoint of the 2.0 mm linear tracking envelope.
• Radial Clearance Requirements: Provide a minimum counterbore diameter of 30 mm (1.2 inches) surrounding the 8 mm tip to prevent side-view interference from the mounting bracket structure.
• Preventing Sensor Cross-Talk: When installing two sensors in an X-Y configuration on the same bearing face, separate the probe tips by a minimum of 40 mm (1.6 inches). This prevents overlapping RF fields from causing cross-talk noise interference.
• Torque and Locking Safety: Once the -10.0 Vdc gap voltage is confirmed, secure the position by tightening the M10 x 1 hex locknut. Do not exceed the structural limit of 12 N·m (106 in·lb). Run lockwire through the predrilled nut holes to secure the assembly against continuous shaft frequency vibration.

Product Advantages

• Excellent Thermal Performance: Designed to exhibit minimal scale factor drift across its full temperature operating profile, ensuring true measurements during extreme turbine startups.
• Tool-Less ClickLoc Connectors: Features gold-plated brass coaxial connectors that engage with a positive click. This design resists terminal corrosion and vibration detachment without requiring special crimping tools.
• Robust Mechanical Design: Built using proprietary TipLoc molding to chemically fuse the ceramic tip to the stainless steel body casing, complemented by CableLoc design offering 330 N of continuous wire pull-strength relief.
• Maximum Routing Flexibility: The unarmored cable option provides a tight bend radius, allowing for smooth, zero-resistance routing paths inside tight internal machine cavities or dedicated external conduit junctions.
• Hot-Swap Capability: Manufacturing standards allow the probe, cable, or Proximitor sensor to be replaced independently without requiring any field calibration.

Ordering Information

Procurement Note: For new installation drop-ins, verify your required total loop length (5.0m or 9.0m) to ensure the matching 3300 XL Extension Cable and Proximitor Sensor are requested concurrently with this probe.

Logistics and Shipping

To preserve precision hardware calibration during global transport, all products are handled with industry-standard instrument packing steps:

Professional Packaging Protocol:

Every Bently Nevada 330103 probe is sealed inside an anti-static industrial packaging shield to isolate the internal eddy-current components from static discharge hazards. The sensor head and its flexible unarmored cable are cradled within custom-cut, high-density shock protection foam liners inside a heavy-walled corrugated structural shell. This eliminates the risk of impact crimping, connector flattening, or drop damage during long-distance international air or sea cargo shipping.

Frequently Asked Questions

• Can I use a 330103-00-05-50-02-00 probe with a standard 5.0-meter extension cable?

  No, it requires a 4.5-meter extension cable. The integrated 0.5m cable must combine with a 4.5m cable to maintain the required 5.0m total system electrical loop tuning.

• What does the "00" at the end of the part number signify?

  The ending "00" indicates standard non-approvals. This model is built for safe, non-hazardous areas where explosion-proof or intrinsically safe certifications are not legally required.

• What is the scale factor of this 3300 XL probe system?

  The system produces a standard scale factor of 7.87 V/mm (200 mV/mil) when correctly paired with a matching 3300 XL extension cable and Proximitor sensor.

• Why select the short 0.5-meter cable option ("50") for this probe?

  The short 0.5m lead is ideal for internal bearing housings. It avoids leaving excess cable coiled inside hot, oil-slick machine casings where it could snag or degrade.

• What is the minimum bend radius for this unarmored coaxial cable?

  Maintain a minimum bend radius of 25.4 mm (1.0 inch). Kinking the cable past this limit permanently degrades structural impedance, causing severe calibration tracking errors.

• Does this metric probe require routine calibration after installation?

  No. The 3300 XL series features complete factory interchangeability. As long as the total system loop length is maintained, you can swap components without field tuning.

• What target material is this proximity probe calibrated against?

  It is factory-calibrated against AISI 4140 electric steel. Target metals with higher chromium or aluminum content will alter the sensor's scale factor accuracy.

• Can I use this probe with a 3300 NSv platform Proximitor?

  No. The 3300 XL 8 mm system operates on a different RF frequency and tuning curve than the NSv series. Mixing the two platforms causes massive measurement drift.