Description

Equipped with stainless steel armor over a 75-ohm coaxial cable, the 330902-36-89-05-01 is a 3300 NSv proximity probe featuring a 1/4-28 UNF-2A thread configuration, a 3.6-inch unthreaded length, and an 8.9-inch overall case length. This specific configuration operates as part of the Bently Nevada 3300 XL NSv Transducer System, which is used for non-contact eddy-current displacement measurements in applications with tight clearances and reduced target areas. Sibling variants like the 330901 operate without armor, whereas this armored configuration safeguards the probe cable against abrasive wear and physical damage inside high-temperature machinery housings.

The system comprises the armored probe, a 330930 extension cable, and a 330980 Proximitor sensor. With its 0.5-meter total length and pre-installed ClickLoc connector protector, this probe provides a 1.5 mm (60 mils) linear range and is calibrated to match AISI 4140 steel targets. It is typically deployed on small-bore machinery, aeroderivative gas turbines, and other rotating equipment where restricted installation envelopes limit standard 5 mm or 8 mm probe options.

Features

• Stainless steel armor provides physical protection against physical wear, shearing, and industrial contaminants.
• Option 36 specifies a 3.6-inch unthreaded length on a 1/4-28 UNF-2A threaded case.
• Option 89 defines an 8.9-inch overall case length.
• Option 05 designates a 0.5-meter (20-inch) total probe length.
• Option 01 includes a miniature coaxial ClickLoc connector with a fluorosilicone connector protector.
• PPS (polyphenylene sulfide) tip material maintains stable physical properties in industrial environments.

Applications

• Radial vibration monitoring of small-diameter shafts under 20 mm (0.8 inches).
• Axial position measurements on shafts smaller than 13 mm (0.5 inches).
• Aeroderivative gas turbines and high-speed centrifuges with restricted geometric clearance.
• Small-bore machinery housings where tight transducer mounting is required.

Ordering Information

Technical Specifications

Installation Guidelines

To avoid cross-talk when installing multiple 3300 NSv probes, maintain a minimum tip-to-tip separation of 25 mm (1.0 inch) for axial position measurements or 23 mm (0.9 inch) for radial vibration setups. Ensure the maximum rated torque of 7.3 N-m (65 in-lb) is not exceeded during installation to prevent damage to the thread or internal sensor elements. The minimum bend radius of 25.4 mm (1.0 inch) must be observed when routing the armored coaxial cable. For hazardous area installations, connect the system using approved intrinsically safe zener barriers or galvanic isolators according to Bently Nevada drawing 141092.

Compliance and Certifications

This system complies with key industrial directives, including European Community EMC Directive 2014/30/EU (standards EN 61000-6-2 and EN 61000-6-4) and RoHS Directive 2011/65/EU. Hazardous area options support multiple approvals (CSA, ATEX, IECEx) for Class I, Zone 0/2, Class I, Groups A, B, C, D, Class II, Groups E, F, G, and Class III when properly connected through approved safety barriers. It is certified for Functional Safety applications up to SIL 2 (HFT = 0) and SIL 3 (HFT = 1).