Description

The Bently Nevada 330101-48-71-20-02-00 is an 8 mm proximity probe belonging to the industry-standard 3300 XL 8 mm Proximity Transducer System. Designed for non-contact vibration and shaft position measurements, this probe operates on the eddy current principle to provide precise displacement feedback. This specific configuration features a 3/8-24 UNF threaded body without armor, with a 4.8-inch unthreaded length, a 7.1-inch overall case length, and a total cable length of 2.0 meters (6.6 feet) terminated in a miniature coaxial ClickLoc connector with standard cable. It does not require agency approvals, making it an ideal choice for standard industrial environments where certified hazardous area protection is not mandatory.

As part of the 3300 XL series, this proximity probe offers excellent mechanical and environmental durability. It is fully compatible with 330180 series Proximitor sensors and standard 3300 XL extension cables. When integrated into a complete 3300 XL monitoring chain, it delivers highly accurate and repeatable measurements, ensuring reliable machinery protection for critical assets such as steam and gas turbines, compressors, pumps, and other rotating machinery.

Features

• Eddy-current technology for reliable non-contact displacement and vibration measurement.
• Specially configured with a 4.8-inch unthreaded portion and a 7.1-inch total case length.
• 2.0 meters (6.6 feet) of standard triaxial FEP-insulated probe cable for reliable signal transmission.
• Miniature coaxial ClickLoc connector provides a secure, vibration-resistant connection.
• Viton O-ring pressure seal built into the probe tip to prevent leakages through the casing.
• Fully compatible with Bently Nevada 3300 XL series Proximitor sensors and extension cables.
• Designed for permanent mounting on bearing housings, machine casings, or external brackets.

Applications

This proximity probe configuration is commonly deployed in various rotating machinery applications to monitor critical mechanical parameters:

• Shaft radial vibration measurements on high-speed turbines and compressors.
• Axial thrust position and rotor displacement monitoring in pumps and gearboxes.
• Eccentricity and phase reference (Keyphasor) tracking.
• Permanent machine protection in heavy-industry sectors including power generation, oil and gas, and chemical processing plants where standard, non-certified components are sufficient.

Ordering Information

Technical Specifications

Installation Guidelines

To achieve reliable vibration and position monitoring, follow these essential engineering and installation guidelines:

• Probe Gap: Ensure the probe is mounted with the appropriate gap setting matching the system calibration (typically gapped at 1.27 mm or -9 Vdc for radial vibration measurements over the linear range).
• Unthreaded Length Selection: The 4.8-inch unthreaded length of this probe must be chosen correctly to clear mounting bosses or brackets without interfering with internal rotating components.
• Cable Protection & Bend Radius: Maintain a minimum cable bend radius of 25.4 mm (1.0 in). Route cables through conduits or protective trays to prevent mechanical damage, keeping them away from high-voltage lines to minimize electromagnetic interference.
• Coaxial Connection: Ensure ClickLoc coaxial connectors are joined finger-tight. Avoid using heavy pliers or exceeding the maximum connector torque of 0.565 Nm (5 in-lbf).
• Grounding & Shielding: Properly ground and shield the entire transducer loop. Shielding should typically be terminated at the monitor end, maintaining isolation at the probe casing.

Compliance and Certifications

This standard Bently Nevada 330101-48-71-20-02-00 configuration utilizes the -00 approval option and is designed for general purpose, non-hazardous industrial environments. It does not carry explosive atmosphere certifications (such as ATEX, IECEx, or CSA hazardous area approvals), which are designated under option code -05. However, it is manufactured under rigorous ISO 9001 quality management procedures and conforms to Bently Nevada's high mechanical, electrical, and environmental performance standards.