Bently Nevada 330101-38-49-20-02-05 Eddy Current Proximity Sensor 3300 XL

Product Overview

The Bently Nevada 330101-38-49-20-02-05 functions as a vital sensing element within the 3300 XL 8 mm Proximity Transducer System. This specific probe configuration adheres to the rigorous technical standards established by API 670, ensuring mechanical compatibility and exceptional accuracy for Turbine Supervisory Instrumentation (TSI). By utilizing eddy current technology, the probe captures high-frequency vibration and thrust data without physical contact with the target material. Consequently, it maintains high signal integrity even in the presence of oil, water, or steam within the machine housing.

Technical Specifications

The following parameters define the 330101-38-49-20-02-05 probe configuration:

• Model Number: 330101-38-49-20-02-05
• Unthreaded Length Option (38): 3.8 inches
• Overall Case Length Option (49): 4.9 inches
• Total Length Option (20): 2.0 meters (6.6 feet)
• Connector and Cable Option (02): Miniature coaxial ClickLoc connector, standard cable
• Agency Approval Option (05): Multiple Approvals (CSA, ATEX, IECEx)
• Thread Type: 3/8-24 UNF-2A
• Armor Option: No Armor
• Linear Measurement Range: 2.0 mm (80 mils)
• Operating Temperature: -51 °C to +177 °C (-60 °F to +351 °F)
• Nominal Scale Factor: 7.87 V/mm (200 mV/mil)

Engineering and Design Advantages

Beyond simple measurement, the 330101 series incorporates Bently Nevada’s patented TipLoc molding method. This advanced construction creates a superior bond between the probe tip and the stainless steel probe body, which effectively prevents tip separation under high-vibration conditions. Furthermore, the probe body features high-grade 300 series stainless steel to resist corrosion and chemical exposure.

Additionally, the 3300 XL system supports total interchangeability. This feature allows users to replace probes or extension cables without matching individual components or performing tedious field recalibrations. Moreover, the integrated gold-plated ClickLoc connectors provide a secure, tool-free locking mechanism that prevents the coaxial connection from loosening due to machinery vibration.

Application and Installation

Critical assets such as steam turbines, centrifugal compressors, and large electric motors utilize the 330101-38-49-20-02-05 for continuous condition monitoring. Because this probe features an extended unthreaded length, it specifically facilitates installation in deep boreholes or thick mounting brackets where clearance is a factor.

During the setup phase, technicians must ensure the probe is gapped correctly to reach the center of its linear range. This process typically involves verifying the DC bias voltage using a standard digital voltmeter. Ultimately, transitioning to this 3300 XL technology enables industrial facilities to achieve superior signal-to-noise ratios, thereby reducing false alarms and improving the overall reliability of the machinery protection system.

FAQs

What is the purpose of the unthreaded length option?The unthreaded length (Option 38) allows the probe to pass through a mounting bracket or housing without the threads catching. This design is particularly useful when the mounting depth is greater than the required threaded engagement.

Can I use this probe with a standard extension cable?The 330101-38-49-20-02-05 is designed to work with any 3300 XL 8 mm extension cable. However, for the system to maintain its 200 mV/mil calibration, the total system length (probe plus extension cable) must match the configuration of the Proximitor sensor (e.g., a 5-meter or 9-meter system).

Is this probe suitable for explosive environments?Yes, the “05” approval option indicates that this probe carries multiple international hazardous area certifications, including CSA, ATEX, and IECEx approvals, making it safe for use in intrinsically safe applications.