Description

The Bently Nevada 330101-00-77-20-02-00 is an 8 mm proximity probe belonging to the industry-standard 3300 XL series machinery protection and condition monitoring system. Designed for high-reliability industrial applications, this non-contact eddy-current sensor provides highly accurate displacement measurements, allowing operators to monitor shaft position and radial vibration in rotating machinery. By tracking the distance between the probe tip and a conductive metal target, it acts as a critical early warning sensor against machine wear, imbalance, or alignment faults.

This specific variant is configured with an unthreaded length of 0.0 inches (00 Option) and an overall case length of 7.7 inches (77 Option). This fully threaded, extended stainless steel body is ideal for deep-insertion mounting configurations in bearing housings or machine casings where a substantial threaded reach is required. It features a total cable length of 2.0 meters (20 Option) of standard unarmored coaxial cable terminated with a miniature ClickLoc connector (02 Option). This configuration is designed without agency approvals (00 Option), making it a highly cost-effective and dependable choice for general-purpose rotating machinery protection in non-hazardous industrial environments.

Features

• Standard 8 mm probe tip diameter optimal for non-contact vibration and position measurements.
• Fully threaded 3/8-24 UNF-2A stainless steel body with 0.0 inches of unthreaded length and 7.7 inches of overall case length.
• Standard 75 ohm coaxial cable with a total system length of 2.0 meters (6.6 feet) and no protective armor casing.
• Premium miniature male ClickLoc coaxial connector for reliable and quick connection to extension cables.
• Robust Viton O-ring seal embedded between the probe tip and the stainless steel case to resist pressure differentials.
• No agency approvals required, offering an economical sensor configuration for safe-area machine installations.

Applications

The Bently Nevada 330101-00-77-20-02-00 proximity probe is deployed extensively across heavy industries such as power generation, oil and gas, petrochemical, and water processing. Typical machinery applications include:

• Radial shaft vibration monitoring on steam and gas turbines.
• Axial thrust position measurement on high-speed centrifugal compressors and pumps.
• Rotor displacement and eccentricity tracking in industrial generators and large electric motors.
• Shaft centerline position tracking in fluid-film bearings.
• Continuous monitoring and protection loops integrated with Bently Nevada 3500 rack systems.

Ordering Information

Technical Specifications

Installation Guidelines

To ensure proper operation and avoid measurement errors, the Bently Nevada 330101-00-77-20-02-00 proximity probe should be installed according to the following engineering standards:

• Target Gap Calibration: Adjust the physical gap between the probe tip and target (typically 1.27 mm or 50 mils) to achieve a nominal system output voltage of -10 Vdc, centering the measurement in the linear region.
• Metal Side Clearance: Maintain a minimum clear distance around the probe tip of at least three times the probe tip diameter (24 mm) to prevent the sensor from experiencing crosstalk or interference from surrounding mounting brackets.
• Coaxial Cable Bend Radius: Maintain a minimum physical bend radius of 25.4 mm (1.0 inch) for standard coaxial cables during routing to protect the internal conductor from damage.
• Shield Grounding: Ensure the probe and extension cable shields are electrically isolated from the machine ground and connected back to the single-point ground terminal at the Proximitor sensor housing.
• Torque Limitations: Tighten locking nuts to a maximum torque of 33.9 N-m (300 in-lb) to prevent case distortion or thread binding.