Product Overview

The Bently Nevada 330704-000-100-10-01-CN is a high-precision 11 mm proximity probe belonging to the world-renowned 3300 XL series. Engineered for heavy-duty industrial applications, this transducer system is optimized for monitoring large-clearance rotating machinery where standard 8 mm probes lack the required measurement depth. By leveraging advanced eddy-current technology, the 330704-000-100-10-01-CN provides a non-contact, highly stable displacement measurement that is essential for identifying shaft vibration, position, and eccentricity in critical assets.

As a primary sensor for turbomachinery protection, this unit plays a vital role in predictive maintenance programs by detecting early mechanical fatigue, bearing degradation, and shaft misalignment. The "CN" suffix designates its specific regulatory compliance, ensuring it meets rigorous quality and safety standards for the global market. Designed to operate seamlessly with the 3300 XL Proximitor sensor and high-quality extension cables, this probe delivers a linear range of 4.0 mm (160 mils), making it the ideal choice for massive industrial pumps, gas turbines, and compressors where thermal growth and mechanical clearances are significant. Whether integrated into a Bently Nevada 3500 monitoring system or utilized as a standalone diagnostic tool, this probe offers the reliability, precision, and longevity that instrumentation engineers and facility managers demand.

Technical Specifications

Model Configuration Explanation

The 330704-000-100-10-01-CN part number breakdown provides a technical blueprint of the hardware specifications:

• 330704: Standard 3300 XL 11 mm proximity probe base model.

• 000: Unthreaded length configuration (0 mm).

• 100: Total case length (100 mm).

• 10: Thread size (3/4-16 UNF-2A) for secure installation.

• 01: Total cable length (0.5 meter, integral).

• CN: Agency approval designation for international compliance and quality assurance.

Typical Applications

• Large Steam/Gas Turbines: Ideal for monitoring radial shaft vibration in bearings with large operational clearances.

• Industrial Gearboxes: Suitable for measuring pinion shaft deflection and gear mesh vibration in high-torque gear assemblies.

• Centrifugal Compressors: Provides critical axial position monitoring to prevent rotor-to-stator contact.

• Hydroelectric Generators: Used for tracking shaft centerline position and eccentricity in massive, slow-moving generators.

• Predictive Maintenance: Acts as the primary sensing element for Bently Nevada 3500 or 1900/65A machine protection monitors.

System Compatibility

This proximity probe is fully compatible with the Bently Nevada 3300 XL 11 mm Proximitor sensor system. To maintain measurement precision, it is vital to pair this probe with the correct 11 mm extension cable (impedance-matched at 75 Ohms) and the associated Proximitor. The entire system is engineered for integration into the Bently Nevada 3500 Machinery Protection System and is compatible with modern diagnostic platforms, ensuring that your machinery data is always accurate, logged, and actionable.

Installation & Calibration Guidelines

• Mounting Protocol: Ensure the probe is mounted at a 90-degree angle to the shaft. Use the included jam nuts to secure the probe, ensuring it remains fixed despite extreme mechanical vibration.

• Gap Voltage Setting: Use an external voltmeter at the Proximitor’s output terminals to verify a gap voltage of approximately -1.25V DC. This ensures the probe is centered in its 4.0 mm linear range.

• Signal Shielding: All coaxial cables should be routed through dedicated conduit to shield the signal from electromagnetic interference (EMI) or radio frequency interference (RFI).

• Surface Preparation: The shaft surface target must be smooth and free of scratches, paint, or oxidation. Surface irregularities ("runout") can cause false vibration readings.

• Torque Control: Do not exceed the manufacturer’s recommended torque for the probe housing, as this can lead to deformation of the stainless steel casing and internal signal distortion.

Product Advantages

• Superior Range: Its 4.0 mm (160 mils) linear range effectively doubles the capability of standard 8 mm probes, allowing for monitoring of machines with significant thermal or mechanical movement.

• Ruggedized Construction: The 303 stainless steel housing and fluoropolymer cable jacket provide high resistance to corrosive chemicals, oils, and intense thermal cycling.

• Vibration-Proof Connection: The ClickLoc connector system ensures that electrical connections remain secure even under constant, high-frequency machine vibration.

• Industry Standardization: Bently Nevada remains the global benchmark, ensuring that your technicians are using familiar, well-documented, and readily available components.

Ordering Information

• 330704-000-100-10-01-CN 11 mm Proximity Probe.

• Includes thread protective cap and essential installation instructions.

• Note: Extension cables and Proximitor sensors are sold separately. Please confirm your required system length (5m or 9m) before finalizing your order.

Frequently Asked Questions

• Can I use an 11 mm probe in an 8 mm system?

  No. The 11 mm probe requires an 11 mm-specific Proximitor sensor and matching calibration, as the inductance and sensitivity are fundamentally different.

• What does the "CN" suffix mean on this probe?

  The "CN" suffix indicates specific regional certification and quality compliance, ensuring the hardware meets the required standards for safe industrial operation.

• What is the maximum linear range of this probe?

  The 330704-000-100-10-01-CN offers a linear range of 4.0 mm, which is twice that of standard 8 mm probes, ideal for larger machine gaps.

• Why should I choose Bently Nevada over other brands?

  Bently Nevada has set the industry standard for over 30 years. Using original components ensures system accuracy and compatibility with your existing 3500 monitor racks.

• How do I know if the probe is damaged?

  Common signs include erratic signals, a "Gap" error on your vibration monitor, or a complete signal loss due to internal coil breakage.

• Can this probe operate at 150°C?

  Yes, the 3300 XL system is rated up to 177°C, making it safe for operation in most high-heat turbine and compressor environments.

• Is the probe cable field-repairable?

  No. The cable is factory-calibrated to the probe tip. Any field repair, such as splicing, will alter the signal impedance and render the system inaccurate.

• What is the role of the Proximitor sensor?

  The Proximitor acts as an oscillator/demodulator, converting high-frequency signals from the probe into a proportional voltage signal for the monitoring rack.

• How often should I check the probe gap?

  Gap settings should be verified during commissioning and as part of the standard preventive maintenance schedule (e.g., during major machinery outages).

• What material is the probe housing made of?

  The housing is constructed from AISI 303 stainless steel, which provides excellent mechanical strength and resistance to rust and corrosion.