3300 NSv Bently Nevada 330901-00-12-05-02-CN 1/4-28 UNF Probe

Product Overview

The Bently Nevada 330901-00-12-05-02-CN is a high-performance 3300 NSv (Narrow System) proximity probe, specifically developed for machinery with tight internal clearances where standard sensors cannot be utilized. This Made in U.S.A. transducer provides accurate eddy-current measurements for shaft vibration and axial position. This configuration utilizes a 1.2-inch case length and a 1/4-28 UNF thread, constructed from durable AISI304 stainless steel. Depending on the final assembly, the unit weighs between 14 and 150 grams, offering a compact yet powerful monitoring solution with official CN country-specific approval.

Core Technical Advantages

Precision and environmental resilience are core to this NSv series probe. The probe tip is crafted from Polyphenylene sulfide (PPS), ensuring excellent chemical resistance and structural integrity. The 75 Ω coaxial cable is protected by fluoroethylene propylene (FEP) insulation, maintaining signal clarity and a consistent DC resistance of 4.0 ± 0.5 ohms for the 0.5-meter length. For secure mechanical integration, the case supports a recommended installation torque of 5.1 N•m (45 in•lb), ensuring the probe remains stable even under intense machine vibration.

Technical Specifications

Installation & Engineering Data

Successful deployment of the 330901-00-12-05-02-CN requires adhering to specific thread engagement limits, with a maximum length of 0.375 inches for the 1/4-28 thread. The probe is equipped with a Viton O-ring designed to seal differential pressure between the tip and the case, though users should note that probes are not pressure tested prior to shipment. When installing in low-temperature zones, be aware that sustained exposure below -34°C (-30°F) may affect the pressure seal's long-term performance, despite the probe's broader operating range.

Engineering Advantages

The 3300 NSv system's primary advantage is its small "view" footprint, which reduces side-viewing interference in narrow gaps. This model maintains a linear output even when sensing targets with limited surface area. The ClickLoc® connector system provides a secure, vibration-proof connection to the extension cable, ensuring signal continuity without the drift often associated with standard coaxial joints. This reliability is vital for the predictive maintenance of centrifugal compressors, small pumps, and other high-speed rotating equipment where space is at a premium.

Technical FAQs

Q1: What is the recommended torque for the 1/4-28 probe case?
A1: The recommended installation torque is 5.1 N•m (45 in•lb), with a maximum rated torque of 7.3 N•m (65 in•lb) to ensure the case remains secure without damaging the housing threads.

Q2: Does this probe come with cable armor?
A2: No, this specific model is configured without armor to maintain maximum cable flexibility and ease of routing through small conduits.

Q3: What is the resistance measurement for the 0.5m cable?
A3: For the 0.5-meter version, the DC resistance from the center conductor to the outer conductor should measure 4.0 ± 0.5 ohms.