Bently Nevada 330905-02-10-05-02-CN 3300 XL NSv Proximity Probe

Description

The 330905-02-10-05-02-CN operates as a non-contacting eddy-current transducer designed for continuous shaft displacement and dynamic vibration monitoring loops. This metric-thread sensor forms a core input component of the 3300 XL NSv Proximity Transducer System, which is specifically engineered for deployment inside centrifugal air compressors, refrigeration compressors, and process gas machinery characterized by restricted internal clearances and tight installation requirements. By transmitting a high-frequency radio frequency (RF) carrier signal from its tip, the probe dynamically senses minute gap changes over a moving metallic target surface and relays these raw analog displacement readings back to a remote Proximitor module for signal processing.

This specific configuration provides an optimized sensor framework for areas where deep counterbores, sideview, or rearview spatial limitations prevent the use of standard 5 mm or 8 mm proximity probe designs. The 330905-02-10-05-02-CN features a rugged M8x1 metric threaded casing constructed from AISI 304 stainless steel and equipped with an interlocking stainless steel armor sleeve, shielding the internal coaxial core against physical crushing, severe mechanical abrasion, and prolonged oil exposure. It is factory-calibrated to capture dynamic radial vibration on narrow rotating shafts smaller than 51 mm (2 in) or track axial thrust coordinates on flat target faces smaller than 15 mm (0.6 in). Configured with localized approval specifications for mainland industrial compliance, it provides reliable structural vibration diagnostics to host machinery protection frameworks.

Features

• Low-profile transducer tip design engineered specifically for small target surfaces and machinery counterbores with limited sideview clearance.
• M8x1 metric threaded body integrated with a robust stainless steel armor sleeve to withstand harsh operational stress and physical shearing forces.
• Integrated gold-plated brass ClickLoc miniature coaxial plug providing a low-loss, vibration-proof positive locking wire connection.
• Patented TipLoc molding technique creating a high-integrity, robust bond between the polyphenylene sulfide tip and the stainless steel body.
• Patented CableLoc design providing up to 220 N (50 lb) of tensile pull strength securely coupling the probe cable to the tip assembly.
• Direct drop-in mechanical and electrical backward compatibility with legacy Bently Nevada 3300 RAM transducer systems and 190 series processing hardware.

Applications

• Radial shaft vibration and dynamic fluid-film bearing displacement tracking on high-speed industrial centrifugal air compressors.
• Dual-direction rotor axial thrust position offset capture inside compact turbo-expander gearboxes with narrow clearances.
• Rotating target speed detection, zero-speed confirmation, and Keyphasor phase reference signal generation in confined locations.

Mechanical Profile & Exact Weight Formulas

In high-integrity machine diagnostics, generic dimensions cannot replace precise engineering calculations. Following the technical constants detailed in the official Bently Nevada 147385 datasheet, the physical geometry and cumulative dry mass metrics for this specific 0.5-meter armored metric probe are calculated as follows:

• Unthreaded Case Length (Option A): Exactly 20 mm (0.79 in).
• Overall Case Length (Option B): Exactly 100 mm (3.94 in).
• Threaded Case Section: Calculated as Overall Case Length minus Unthreaded Length (100 mm - 20 mm) = 80 mm (3.15 in) of active M8x1 threads.
• Total Physical Cable Length (Option C): Exactly 0.5 meter (1.6 feet / 19.7 inches) measured from the probe tip face to the terminal coaxial joint.
• Linear Mass Density of Armored Cable: Nominal 64 grams per meter (0.70 oz/foot) driven by the weight of the interlocking stainless steel armor jacket.
• 1.0-meter Reference Cable Weight: Nominal 64 grams. Thus, the 0.5-meter segment weighs exactly 32 grams.
• Net Probe Head and 100 mm Case Mass: Approximately 48 grams (1.69 oz) including the elongated M8 stainless steel threaded barrel, internal sensing coil, and localized transition hub.
• Total Net Hardware Weight: Calculated as 32 g (0.5m armored cable) + 48 g (case assembly) = 80 grams (2.82 oz) absolute net hardware weight per unit (excluding heavy field packaging box materials and the accompanying 13 mm lock nut).

Ordering Information

Technical Specifications

Connections/Interfaces

Installation Guidelines

• Total System Loop Matching: This 0.5-meter physical length probe must be paired exclusively with a 4.5-meter extension cable to form a 5.0-meter total system loop, or a 6.5-meter extension cable to form a 7.0-meter total system loop. The total length must precisely match the electrical calibration length specified on the 3300 XL NSv Proximitor sensor.
• Mechanical Gap Adjustment: Thread the probe into the mounting bracket or casing using the 7 mm wrench flats until the tip contacts the target surface, then back it out to the designated linear gap voltage threshold (typically -9.0 Vdc at the linear midpoint, representing approx. 1.0 mm gap distance) before tightening the 13 mm lock nut.
• Avoid Ground Contacts: Ensure the miniature coaxial ClickLoc connector junction does not touch the metal walls of the junction box or conduit fittings. Wrap the connected union with self-fusing silicone tape to prevent electrical noise loop interference and ground loops.
• Conduit Protection Routing: The flexible stainless steel armor provides excellent mechanical protection; however, the probe lead wire should still be routed within dedicated low-voltage instrument trays to minimize exposure to high-voltage electromagnetic fields (EMI).

Compliance and Certifications

• EMC Directive: European Community Directive 2014/30/EU compliant, tested to EN 61000-6-2 (Immunity for Industrial Environments) and EN 61000-6-4 (Emissions for Industrial Environments).
• RoHS Directive: European Community Directive 2011/65/EU compliant.
• China RoHS: EFUP designation of 15 years in accordance with SJ/T 11364-2024 for associated cabling.
• Regional Compliance (-CN): Meets designated localized criteria for hazardous area installations within Mainland China jurisdictions.