Bently Nevada 330703-000-060-50-02-05 3300 XL 11 mm Proximity Probe

Product Overview

The Bently Nevada 330703-000-060-50-02-05 serves as a high-precision sensing element within the 3300 XL 11 mm Transducer System. Because larger machinery often requires a more significant linear measurement range, this 11 mm probe provides an extended 4.0 mm (160 mil) linear range—double that of the standard 8 mm system. Furthermore, this probe maintains high stability and accuracy even in the presence of oil, water, or steam. Consequently, it acts as a primary defensive component in Turbine Supervisory Instrumentation (TSI) for power generation and heavy industrial processing.

Technical Specifications

The following technical configuration applies to the 330703-000-060-50-02-05 model:

• Model Number: 330703-000-060-50-02-05
• Unthreaded Length Option (000): 0.0 inches
• Overall Case Length Option (060): 6.0 inches
• Total Length Option (50): 5.0 meters (16.4 feet)
• Connector and Cable Option (02): Miniature coaxial ClickLoc connector, standard cable
• Agency Approval Option (05): Multiple Approvals (includes ATEX, IECEx, and CSA)
• Tip Diameter: 11 mm
• Linear Range: 4.0 mm (160 mils) approximately
• Scale Factor: 3.94 V/mm (100 mV/mil)
• Operating Temperature: -51 °C to +177 °C (-60 °F to +351 °F)
• Weight: 0.16 kg

Engineering and Design Advantages

In addition to its extended range, the 330703 series utilizes a patented TipLoc molding method that creates a superior bond between the probe tip and the stainless steel body. This design ensures that the probe withstands high-pressure environments without the risk of tip loss. Moreover, the 3300 XL series incorporates advanced temperature compensation in the probe coil, which effectively minimizes measurement drift caused by extreme thermal fluctuations in turbine housings.

To further enhance field reliability, the probe features gold-plated ClickLoc connectors. These connectors resist corrosion and utilize a positive-locking mechanism that prevents the cable from loosening under high-frequency vibration. Furthermore, the 5.0-meter integrated cable eliminates the need for an extension cable in specific 5-meter system configurations, thereby reducing the number of connection points and potential failure locations.

Application and Installation

Industrial operators typically deploy the 330703-000-060-50-02-05 on large-scale assets such as gas turbines, steam turbines, and high-capacity centrifugal compressors. Because the 11 mm system offers a wider linear range, it is specifically suited for axial thrust measurements where the shaft may move significantly during startup or thermal loading.

During the installation phase, the 1/2-20 UNF threaded body allows for secure mounting into specialized brackets. Technicians must ensure the probe remains gapped within its linear region using a digital voltmeter to verify the DC bias voltage. Transitioning to this 3300 XL system enables facilities to comply with API 670 standards, ultimately improving the reliability of machinery protection and reducing the risk of catastrophic asset failure.

FAQs

Why would I choose an 11 mm probe over an 8 mm probe?The 11 mm probe provides a significantly larger linear range (approx. 160 mils) compared to the 8 mm probe (approx. 80 mils). Therefore, you should specify the 11 mm system for large machines where the expected shaft movement exceeds the measurement limits of smaller sensors.

What does the “05” Agency Approval option mean for my facility?The “05” option signifies that the probe carries multiple international certifications for hazardous areas. This includes North American and European standards, allowing you to use the probe in explosive atmospheres where intrinsic safety is required.

Is this probe interchangeable with other Bently Nevada systems?The 330703 probe is designed specifically for use with 3300 XL 11 mm Proximitor sensors. While it shares some physical characteristics with the 3300 XL 8 mm series, the electrical calibration differs, so you must pair it with the correct 11 mm Proximitor to ensure accurate 100 mV/mil output.