Description

For high-precision vibration and shaft position monitoring, the Bently Nevada 330101-00-11-15-12-CN offers an unarmored 8 mm proximity probe configuration designed for the 3300 XL 8 mm Proximity Transducer System. This system delivers an analog output voltage directly proportional to the gap distance between the probe tip and any observed conductive target, supporting both static displacement and dynamic vibration measurements on fluid-film bearing machinery.

Unlike other variants in the 3300 XL family, this specific configuration features a fully threaded standard case with a 0.0 inch unthreaded length (Option 00) and a compact 1.1 inch overall case length (Option 11) using standard 3/8-24 UNF threads. It is integrated with a 1.5 meter total cable length (Option 15) utilizing advanced FluidLoc cable technology (Option 12). The FluidLoc cable is specifically engineered with an internal liquid barrier to prevent lubricating oil or other industrial process fluids from migrating along the cable core into dry connection areas. The cable is terminated with a standard miniature ClickLoc coaxial connector without a connector protector.

This probe configuration is supplied with the -CN China hazardous area approval package. This package certifies compliance under NEPSI and CCC explosive atmospheres frameworks, ensuring legal and safe installation in zone-classified industrial sites within mainland China. It interfaces seamlessly with the 330180 series 3300 XL Proximitor sensor and a 3300 XL extension cable to provide continuous machinery protection.

Features

• FluidLoc Core Seal: Blocks dynamic fluid migration through the internal cable conductors to maintain enclosure and bearing housing seal integrity.
• Fully Threaded Design: Standard 3/8-24 UNF-2A case with 0.0 inches unthreaded length and 1.1 inches overall case length provides stable mounting flexibility.
• China Certification Package (-CN): Full hazardous area approval compliant with NEPSI and CCC regulations for hazardous environments.
• Exceptional Dynamic Tracking: Eddy-current induction enables sub-micron resolution measurements of high-frequency radial vibration and axial thrust.
• ClickLoc Coaxial Connection: Gold-plated miniature coaxial connection ensures robust signal coupling under severe vibration.
• System Interchangeability: Supports complete compatibility with non-XL 3300 series 5 mm and 8 mm system components without bench recalibration.

Applications

• Steam and Gas Turbines: Monitoring shaft radial vibration, axial position, and Keyphasor speed references under demanding temperature profiles.
• High-Pressure Lubrication Environments: Utilizing FluidLoc cable to prevent hot turbine oil from leaking past the bearing casing.
• Critical Centrifugal Compressors: Protecting high-speed rotor chains against catastrophic casing contact or rotor displacement.
• Chinese Hazardous Industrial Projects: Deploying NEPSI-certified monitoring loops inside petrochemical, refining, and chemical processing facilities.

Ordering Information

Technical Specifications

Installation Guidelines

• Thread Clearance: Mount the probe in a standard 3/8-24 threaded hole. Ensure the maximum thread engagement does not exceed 0.563 inches (14.3 mm) to avoid binding.
• Initial Gapping: Set the mechanical gap to approximately 1.27 mm (50 mils) to achieve the nominal -9 Vdc output on the Proximitor sensor for radial vibration.
• Shield Connection: Route the coaxial cable through dry, clean pathways. Ground the cable shielding at the Proximitor sensor or the local junction box only.
• Target Size Requirements: Ensure the observed shaft target is flat and has a minimum diameter of 15.2 mm (0.6 inches) to prevent scale factor error.
• Hazardous Location Wiring: Install in according with intrinsic safety guidelines using certified barriers or isolators as specified in Bently Nevada drawing 141092 / 140979 for -CN approvals.

Compliance and Certifications

• NEPSI: Intrinsically Safe and Non-Sparking certification for China hazardous environments.
• CCC: China Compulsory Certificate for electrical equipment in explosive atmospheres.
• CE: Conformite Europeenne compliant.
• RoHS: Restriction of Hazardous Substances compliant.