Product Overview

The Bently Nevada 330905-00-13-05-02-05 is a high-precision, non-contacting eddy current transducer component within the specialized 3300 NSv (Neosonic Standard Version) product family. Engineered primarily to address the physical limitations of standard-sized industrial probes, this system excels in tight spatial configurations, small-bore clearings, and installations requiring measurement of small-diameter targets. When standard 5 mm or 8 mm proximity probes suffer from structural side-viewing cross-talk or fail to provide a stable linear range due to narrow mounting brackets, the 3300 NSv design serves as the definitive engineering solution.

The probe functions by generating a high-frequency electromagnetic field from its tip. As a ferromagnetic target—such as a high-speed rotating shaft or machine collar—moves relative to the tip face, the eddy current field distribution is altered. The connected 3300 NSv Proximitor Sensor detects these microscopic fluctuations and converts them into a highly accurate, proportional electrical voltage. This sensor configuration is highly optimized for observing targets with restrictive dimensions, notably shaft diameters below 50 mm (2.0 inches) or flat target surfaces smaller than 13 mm (0.5 inches). It is a vital choice for continuous machinery protection, transient analysis, and operational diagnostics on high-velocity turbomachinery, aeroderivative gas turbines, turbochargers, and precision industrial centrifuges.

Technical Specifications

Model Configuration Explanation

The model designation code 330905-00-13-05-02-05 represents specific mechanical and electrical configurations tailored to distinct industrial applications. The breakdown of this structural matrix is as follows:

• 330905: The base model identifier for the 3300 NSv Proximity Probe featuring standard imperial 3/8-24 UNF threads.
• 00: Unthreaded Length option. Denotes 0.0 inches of unthreaded section, meaning the housing is fully threaded along its entire length to the probe tip base, providing flexible depth adjustments.
• 13: Overall Case Length option. Specifies a compact 1.3-inch total casing length, which is optimal for installation within crowded bearing blocks or shallow machine casings.
• 05: Total Cable Length option. Indicates a short 0.5-meter (1.6 feet) integrated cable. This minimized length prevents excess cable looping and simplifies cable management in confined enclosures.
• 02: Connector Option. Designates a standard miniature coaxial ClickLoc connector supplied without an outer fluid-resistant silicone protection boot.
• 05: Agency Approval option. Represents the comprehensive Multi-Agency approval option package, certifying the sensor for intrinsically safe and non-incendive operation under ATEX, IECEx, and North American (CSA/FM) hazardous area standards.

Typical Applications

• High-Speed Turbochargers: Monitoring radial vibration and thrust displacement on high-velocity engine boosting sub-systems where standard probes cannot clear the housing.
• Machine Tool Spindles: Tracking high-precision dynamic runout, thermal shaft growth, and structural deflection under heavy machining loads.
• Micro-Turbines & Small Pumps: Continuous asset protection for sub-50 MW turbomachinery and small-diameter centrifugal pump rotors operating on fluid-film bearings.
• Industrial Centrifuges: Delivering non-contacting vibration monitoring on small, high-rpm balancing shafts subjected to high G-forces.
• Keyphasor & Speed Detection: Serving as a timing phase reference by observing keyways or slots on small-diameter shafts where narrow spacing prevents standard sensor placement.

System Compatibility

To maintain strict operational calibration and prevent signal degradation, the 330905-00-13-05-02-05 must be treated as a single element of a matched impedance loop. It must be paired with the following specific hardware layers:

• 3300 NSv Proximitor Sensors: Direct connection must be established with a 3300 NSv Proximitor Sensor (such as the 330980 series). It is entirely incompatible with standard 3300 XL 5mm/8mm or older 7200 series drivers.
• Matching Extension Cables: If an extension is required to complete the loop, a 3300 NSv extension cable (330930 series) must be utilized. The aggregate electrical length of the probe plus the extension cable must match the calibrated system length required by the Proximitor (typically 5.0 meters or 9.0 meters total).
• Machinery Protection Infrastructure: The conditioned voltage signal from the Proximitor is designed for seamless routing into the Bently Nevada 3500/42M Proximitor Seismic Monitor or the advanced Orbit 60 series monitoring platform.

Structural Installation Instructions

• Maintain a minimum structural clearance gap of at least 9.5 mm (0.375 inches) of clear space around the probe tip to prevent side-viewing interference or parasitic counter-inductance from the surrounding machine walls.
• Ensure the target material matches AISI 4140 steel; if the observed shaft or target collar uses alternative metallurgical compositions, cross-calibration or scale factor adjustments must be programmed into the monitor software.
• Tighten the 3/8-24 UNF locking hex nuts to a maximum mechanical torque specification of 11.3 N·m (100 in·lb) to completely eliminate the risk of cracking or deforming the stainless steel casing.
• Adjust the physical mounting depth of the probe until the static DC voltage measured at the Proximitor output terminal reads approximately -10 VDC, which corresponds precisely to the midpoint of the 60-mil linear tracking envelope.
• Route the integrated coaxial cable using a minimum structural bend radius of 25.4 mm (1.0 inch) to prevent internal fracture of the high-frequency shielding layers.
• Isolate all sensor cables from nearby high-voltage AC electrical lines by running them within dedicated, grounded flexible conduit to eliminate industrial electro-magnetic interference (EMI/RFI).

Product Advantages

• Optimized for Spatial Constraints: The ultra-compact 3/8-24 UNF body envelope allows for direct machinery integration where larger 8 mm models physically cannot fit.
• High Resolution on Narrow Targets: Engineered specifically to maintain strict signal linearity on target faces down to 6.4 mm (0.25 inches) in diameter, avoiding edge-effect distortion.
• High Sensitivity Output: Provides a prominent scale factor of 200 mV/mil across its nominal range, allowing diagnostic engineers to observe minor, high-frequency vibration changes.
• Chemical and Thermal Resilience: The PPS tip and stainless steel housing provide a hermetic barrier against synthetic lubricants, oil mists, moisture, and extreme thermal cycling.
• Certified for Hazardous Zones: Certified under ATEX, IECEx, and CSA frameworks, allowing for direct installation inside Zone 0 and Class I, Division 1 explosion-prone environments.

Ordering Information

Logistics and Shipping

To protect the calibrated high-frequency induction coils embedded within the PPS tip, all units are prepared within robust anti-static industrial packaging. This specialized layout neutralizes static charge accumulation during handling and acts as a heavy-duty physical shield against drop impacts and vibration during transport.

Probes are packaged in stress-relieved circular configurations rather than tight bends to eliminate cable memory and structural shielding stress. Standard international transit is serviced via premium networks including DHL, FedEx, and UPS, ensuring fully tracked delivery from distribution hubs directly to industrial plant sites.

Frequently Asked Questions

• What makes the 3300 NSv probe distinct from standard 3300 XL probes?

  The 3300 NSv is specifically engineered for tight spaces and small-diameter targets (such as shafts smaller than 50 mm). It provides accurate measurements where standard 8 mm probes would suffer from severe edge distortion.

• What is the exact linear measurement envelope of this 3300 NSv probe?

  This probe provides a nominal linear range of 1.5 mm (60 mils), delivering high sensitivity and precise tracking across short displacement spans.

• What physical attributes do the "00" and "13" options represent?

  The "00" option means the probe has 0.0 inches of unthreaded length (it is fully threaded up to the tip), and the "13" option specifies a total case length of exactly 1.3 inches.

• Can I connect this probe to a standard 3300 XL 8mm extension cable?

  No. The 3300 NSv system features distinct electrical and impedance characteristics. It must be paired exclusively with a 330930 series NSv extension cable and a 330980 NSv Proximitor.

• Is the 330905-00-13-05-02-05 approved for explosive environments?

  Yes, the "05" approval code indicates multi-agency certifications, including ATEX and IECEx, making it suitable for intrinsically safe installations in hazardous industrial areas.

• What target material is utilized for the standard calibration of this sensor?

  The sensor is calibrated at the factory using AISI 4140 steel. If your application involves a different target alloy, the system's scale factor must be adjusted accordingly.

• What is the structural consequence of over-torquing the probe during installation?

  Exceeding the maximum recommended torque limit of 11.3 N·m (100 in·lb) can distort the stainless steel casing, strip threads, or fracture the internal electrical bonds, leading to sensor failure.

• What does the "02" designation mean in the product code?

  The "02" option specifies that the probe is equipped with a standard miniature coaxial ClickLoc connector without an outer fluid-resistant silicone protection boot.