Description

The Bently Nevada 330101-00-48-20-12-05 is a high-precision 8 mm proximity probe belonging to the industry-standard 3300 XL series. Designed for critical non-contact vibration and shaft position measurements in rotating machinery, this specific configuration features a fully threaded 3/8-24 UNF body with zero unthreaded length (0.0 inches) and an overall case length of 4.8 inches. Notably, this variant is equipped with a 2.0-meter (6.6 feet) patented FluidLoc cable and a miniature coaxial ClickLoc connector without a connector protector. The FluidLoc technology provides an internal barrier that prevents lubricating oils, process fluids, or gases from leaking or wicking through the core of the cable out of the machine housing, making it highly appropriate for fluid-submerged bearing environments. Additionally, this probe configuration comes certified with the -05 hazardous area agency approvals, covering ATEX, IECEx, and CSA standards for intrinsically safe installations.

Operating on the eddy-current principle, this probe pairs with a 330180 series 3300 XL Proximitor sensor and an appropriate extension cable to form a complete 5-meter or 9-meter transducer chain. This system provides a linear output voltage directly proportional to the distance between the probe tip and the observed target, typically an AISI 4140 steel shaft. Known for its exceptional accuracy, robust thermal stability, and mechanical resilience, the 3300 XL system is the global standard for turbomachinery protection, including steam turbines, gas turbines, compressors, gearboxes, and pumps.

Features

• FluidLoc Cable Technology: Patented coaxial cable design that prevents oils, moisture, and gases from leaking out of the machine casing through the cable interior.
• Fully Threaded Body: Designed with a 0.0-inch unthreaded length and a 4.8-inch case length for direct, deep-reach mounting in tapped bearing housings.
• Gold-Plated ClickLoc Connector: Miniature coaxial connector requires only finger-tight torque and resists loosening due to a positive lock mechanism.
• No Armor Option: Flexible and lightweight cable construction without outer steel armor, suitable for conduit routing or clean installation paths.
• Intrinsically Safe Approvals: Certified with the -05 approval option, making it compliant with ATEX, IECEx, and CSA requirements for hazardous environments.
• Eddy Current Measurement: Delivers precise, non-contact measurement of shaft vibration and dynamic position.

Applications

This proximity probe is ideal for demanding rotating machinery installations where process fluid containment is critical. Typical industrial applications include:

• Steam and Gas Turbines: Shaft vibration monitoring and axial thrust position measurement.
• Industrial Compressors and Pumps: Rotor displacement tracking and bearing clearance monitoring.
• Gearboxes and Fans: Continuous machine protection under high-vibration conditions.
• Submerged Bearing Assemblies: Applications where the probe lead is exposed to high-pressure oil lubrication systems.

Ordering Information

The 330101-00-48-20-12-05 probe is a precise combination of mechanical, electrical, and certification options configured via its ordering code segments:

Technical Specifications

Installation Guidelines

To ensure optimal measurement accuracy and system reliability, follow these engineering practices during installation:

• Probe Gap Calibration: Adjust the mechanical gap between the probe tip and target shaft to the specified physical gap (typically 1.27 mm or 50 mils) corresponding to the system's center calibration point before locking the probe in place.
• Thread Engagement: Respect the maximum thread engagement limit of 0.563 inches for 3/8-24 UNF threads to prevent binding or casing damage.
• Cable Routing: Avoid sharp bends; maintain the minimum recommended bend radius for coaxial cables. Ensure the cable is securely supported along its run to prevent whipping or mechanical wear.
• Shielding and Grounding: Ensure proper coaxial shield continuity and system grounding in accordance with Bently Nevada installation drawing 141092 to prevent electromagnetic interference from distorting the vibration signal.
• Fluid Containment: Utilize the sealing capability of the probe tip Viton O-ring, and rely on the internal FluidLoc core barrier to block fluid leakage past the machine boundary.

Compliance and Certifications

This transducer component is designed and certified for use in hazardous areas when connected to appropriate Proximitor sensors and safety barriers:

• ATEX / IECEx: Intrinsically safe for gas and dust environments (Ex ia IIC T5...T1 Ga; Ex ia IIIC T90 degC...T280 degC Dc).
• CSA/NRTL: Class I, Zone 0, Div 1 Group A, B, C, D hazardous location compliance when installed per Bently Nevada drawing 141092.
• Entity Parameters: Ui = -28 V, Ii = 140 mA, Pi = 0.91 W, Ci = 1.5 nF, Li = 610 uH.