Bently Nevada 330101-29-50-10-02-CN 3300 XL 8 mm Proximity Probe

Description

Monitoring shaft vibration and dynamic position in critical rotating machinery is the primary function of the Bently Nevada 330101-29-50-10-02-CN proximity probe. Part of the highly standardized 3300 XL 8 mm series, this non-contacting sensor converts the physical distance between the probe tip and a conductive target into an electrical signal when paired with a matching Proximitor Sensor. It features an unarmored cable design with a thread size of 3/8-24 UNF, engineered to withstand aggressive chemical environments and extreme temperatures on industrial machinery trains.

Features

• Rugged Tip Construction: Molded from polyphenylene sulfide (PPS) for superior resistance to corrosive fluids, oils, and chemical attack inside bearing housings.
• ClickLoc Connector: Equipped with a miniature coaxial ClickLoc connector providing a secure, vibration-proof connection with low electrical loss.
• Robust Case Design: Built using AISI 303 or 304 stainless steel to maintain structural integrity under high pressure and thermal cycling.
• Standardized Thread Configuration: Features a 3/8-24 UNF thread pattern optimized for standard industrial brackets and port mountings.

Applications

• Radial vibration monitoring on high-speed steam and gas turbines.
• Axial thrust position measurement in centrifugal compressors.
• Shaft centerline and orbital analysis on electric motors and generators.
• Casing expansion and thermal growth monitoring in heavy industrial machinery.

Technical Specifications

Empirical Engineering Insights

Alternative Models & Compatibility

This 1.0-meter probe is engineered for integration within a complete 5-meter or 9-meter 3300 XL proximity transducer system. For a complete system, you must match this probe with the correct length of extension cable (e.g., a 4.0-meter extension cable for a 5.0-meter total system) and a corresponding 3300 XL Proximitor Sensor. Mixing 3300 XL components with older, non-XL 3300 components is technically possible but will result in minor calibration and scale-factor discrepancies (typically altering the standard 200 mV/mil output).

Application Pitfalls & Engineering Notes

The unarmored coaxial cable is highly sensitive to physical crushing and sharp bends during installation. Ensure a minimum static bend radius of 25.4 mm (1.0 inch) is maintained throughout the cable run. Grounding loops can compromise signal integrity; prevent the coaxial connector outer shell from making electrical contact with the machine casing or junction box metalwork by using the supplied connector silicone sleeve or Teflon heat-shrink tubing.

Commissioning & Calibration Tips

During mechanical installation, monitor the DC gap voltage directly from the Proximitor Sensor output using a high-impedance digital multimeter. Adjust the physical depth of the probe in the mounting bracket until the DC voltage reads approximately -10.0 VDC, corresponding to the physical midpoint of the linear range (approx. 1.27 mm or 50 mils from the shaft target). Lock the mounting nut to a maximum torque of 13.6 N-m (120 in-lb) to prevent stripping the 3/8-24 UNF threads.

Installation Guidelines