Product Overview

The 330101-00-75-20-02-05 is a high-precision eddy current proximity sensor from the Bently Nevada 3300 XL series. Designed for non-contacting displacement sensing, this 8 mm probe converts the physical gap between the sensor tip and a conductive target into a proportional voltage signal. It is an essential component for Turbine Supervisory Instrumentation (TSI), providing the high-fidelity data required to monitor shaft vibration, axial thrust, and eccentricity in critical rotating machinery such as steam turbines, centrifugal compressors, and high-speed pumps.

Technical Configuration and Build

The specific alphanumeric string for this 3300 XL 8 mm probe defines a specialized hardware build tailored for localized machine mounting:

• Model Number: 330101 (3/8-24 UNF Thread, No Armor)

• Unthreaded Length: 0.0 inches (00 option)

• Overall Case Length: 7.5 inches (75 option)

• Total System Length: 2.0 Meters / 6.6 Feet (20 option)

• Connector Type: Miniature coaxial ClickLoc connector (02 option)

• Agency Approvals: Multi-certified including ATEX, IECEx, and CSA for hazardous areas (05 option)

• Thread Specification: 3/8-24 UNF-2A

• Tip Material: High-performance Polyphenylene Sulfide (PPS)

Performance Characteristics

The 330101-00-75-20-02-05 is engineered to deliver stable performance in the most taxing industrial environments. The probe tip features a patented molecular bond (TipLoc) between the PPS plastic and the stainless steel body, ensuring a hermetic seal against oil, water, and steam wicking.

With an operating temperature range of -51 °C to +177 °C, this probe maintains a standard scale factor of 7.87 V/mm (200 mV/mil). The 3300 XL series also features advanced circuitry that offers superior RFI/EMI immunity, meeting European CE standards without the need for specialized shielded conduit or external enclosures.

System Integration and Applications

A primary advantage of the 3300 XL system is the total interchangeability of hardware. This 2.0-meter probe can be paired with matching 3300 XL Proximitor sensors and extension cables without any manual bench calibration.

• Machinery Protection: Continuous monitoring of radial vibration in fluid-film bearings.

• Axial Thrust: Measuring the longitudinal position of the shaft to prevent internal rotor contact.

• Keyphasor Reference: Providing precise timing and speed measurements for phase-angle analysis.

• Backward Compatibility: Electrically compatible with older non-XL 3300 series 5 mm and 8 mm proximity systems.

• Hazardous Environments: Fully rated for use in explosive atmospheres and zone-rated locations.