Product Overview

The Bently Nevada 330710-000-050-02-00 represents the pinnacle of high-range, non-contact displacement sensing within the renowned 3300 XL 11 mm Proximity Probe system. Engineered specifically for applications requiring a larger linear measurement range than standard 8 mm probes, this transducer system is essential for monitoring shaft vibration, position, and eccentricity in high-capacity rotating machinery. By utilizing the proven eddy-current measurement principle, the 11 mm system offers an extended linear range of 4.0 mm (160 mils), making it the ideal choice for large turbines, gearboxes, and industrial fans where greater thermal expansion or mechanical clearances are expected.

Designed for seamless integration into the Bently Nevada 3500 Machinery Protection System, the 330710-000-050-02-00 transducer ensures that maintenance engineers receive accurate, real-time data regarding the health of mission-critical assets. Its robust design features a specialized probe tip and housing construction that maintains signal integrity even in chemically harsh and high-temperature environments. For engineers seeking a reliable path toward Predictive Maintenance (PdM) and enhanced machinery availability, this 11 mm probe provides the depth and precision necessary to detect early-stage mechanical degradation, effectively preventing costly unscheduled downtime.

Technical Specifications

Model Configuration Explanation

The 330710-000-050-02-00 part number provides precise identification of the probe’s physical architecture:

• 330710: Base model for the 3300 XL 11 mm Proximity Probe.

• 000: Unthreaded length configuration (standard).

• 050: Total case length (50 mm).

• 02: Total cable length (1.0 meter, integral).

• 00: Agency approval (Standard/Non-hazardous).

Typical Applications

This 11 mm probe is specifically engineered for high-clearance rotating equipment:

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

• Industrial Gearboxes: Measuring high-deflection shafts where standard 8 mm probes might reach their linear limit.

• Axial Position Monitoring: Tracking thrust bearing wear in machinery with significant thermal growth.

• Eccentricity Measurement: Monitoring shaft bow or runout in large turbo-generators during startup and shutdown sequences.

• Cooling Tower Fans: Monitoring displacement in large, slow-moving industrial fan assemblies.

System Compatibility

The 330710-000-050-02-00 is a core component of the Bently Nevada 3300 XL 11 mm series. It must be paired with a compatible 3300 XL 11 mm Proximitor sensor and extension cable, all calibrated as a matched system. This probe is fully supported within the Bently Nevada 3500 Machinery Protection System, allowing engineers to feed displacement data directly into high-speed monitoring racks, SCADA systems, or advanced diagnostic software like System 1.

Setup and Installation Guidelines

• Mounting Accuracy: Ensure the probe is mounted perfectly perpendicular to the shaft. Misalignment can introduce significant measurement errors in high-clearance applications.

• Gap Voltage Verification: Use a digital voltmeter to verify the gap voltage (typically -1.25V DC) at the Proximitor output during the initial installation to ensure operation in the linear range.

• Conduit Protection: Protect coaxial cables with flexible metallic conduit to guard against mechanical damage and EMI/RFI interference common in large engine rooms.

• Avoid Mechanical Stress: Do not overtighten the jam nuts. Use the supplied hardware and torque to the recommended specification to prevent probe body distortion.

• Cleanliness: Ensure the shaft target area is free from paint, heavy oil, or rust, as these surface variations can lead to signal "runout" or false readings.

Product Advantages

• Extended Measurement Range: Offers twice the linear range of standard 8 mm probes, providing 4.0 mm of measurement depth for large-clearance equipment.

• Robust Connectivity: Features the Bently Nevada ClickLoc connector, providing a reliable, vibration-proof electrical connection.

• High Chemical/Thermal Resistance: Designed with fluoropolymer insulation to thrive in oily, hot, or chemically active industrial environments.

• Long-Term Reliability: Proven Bently Nevada engineering reduces the frequency of sensor replacements, extending machine overhaul intervals.

Ordering Information

• Model: 330710-000-050-02-00.

• Package includes one (1) 11 mm proximity probe and protective dust cap.

• Essential: Ensure compatibility by ordering the corresponding 11 mm Proximitor sensor and 11 mm-specific extension cables.

Frequently Asked Questions

• Can I replace an 8 mm probe with this 11 mm version?

  No. The 11 mm probe requires a matching 11 mm Proximitor and calibration curves. They are not electrically or physically interchangeable with the 8 mm system.

• What is the "linear range" of this probe?

  The 3300 XL 11 mm system has a linear range of 4.0 mm (160 mils), allowing it to monitor larger shaft movements than the 2.0 mm range of 8 mm probes.

• Is this probe suitable for hazardous areas?

  This specific model (00 suffix) is standard. For explosive environments, please specify the required agency approval (e.g., ATEX, CSA) at the time of ordering.

• Why is the cable length critical in this probe?

  The system is impedance-matched. Changing the cable length changes the inductance/capacitance of the circuit, which invalidates the calibration of the sensor.

• How should I mount the probe for eccentricity monitoring?

  For eccentricity, it is best to use a pair of probes mounted 90 degrees apart at the same axial plane to accurately map the shaft centerline position.

• Does it matter what material the shaft is made of?

  Yes. Bently Nevada probes are calibrated for AISI 4140 steel. If your shaft material is different (e.g., stainless steel), a material calibration factor must be applied.

• How do I identify a failing probe?

  A failing probe often manifests as erratic gap voltages, signal "clipping" in the software, or a complete loss of signal (often caused by cable fatigue or coil breakage).

• Are these probes waterproof?

  They are highly resistant to oil and moisture; however, they are not intended for submersed operation in high-pressure or corrosive fluids without specialized housings.

• Can I use this with the 3500 system?

  Yes, this probe is fully compatible with all current Bently Nevada 3500 series vibration monitoring cards, provided the monitor is configured for 11 mm sensors.

• What is the expected service life?

  In standard clean, industrial conditions, these probes are rated for years of continuous operation, typically lasting until the next major mechanical outage.