Bently Nevada 330103-00-03-90-12-CN 3300 XL 8 mm Proximity Probe

Product Overview

The 330103-00-03-90-12-CN is a flagship 3300 XL 8 mm Proximity Probe engineered by Bently Nevada for the most demanding vibration monitoring and machinery protection applications. As the industry standard for eddy-current sensing, this probe measures fluid-film bearing clearances, shaft vibration, and axial thrust in high-speed rotating equipment. Deployed globally in gas turbines, centrifugal compressors, and large-scale generators, the 330103 provides a linear output scale of 200 mV/mil (7.87 V/mm) when used with a 3300 XL Proximitor Sensor. By offering superior thermal stability and a robust physical seal, this transducer is critical for reducing unplanned outages and extending the operational life of multi-million dollar industrial assets.

Technical Configuration

The nomenclature 330103-00-03-90-12-CN specifies a specialized 3/8-24 threaded hardware configuration. This model features an Unthreaded Length of 0 mm (00) and an Overall Case Length of 30 mm (03), providing a versatile mounting profile for standard bearing housings. The 9.0 metres (90) total length option is particularly significant, as it allows for a direct connection to a Proximitor sensor located at a distance without the need for an additional extension cable, thereby reducing potential signal attenuation points. The ClickLoc miniature coaxial connector (12) ensures a secure, moisture-resistant connection. Built with a Polyphenylene sulfide (PPS) tip and AISI 303/304 stainless steel case, the probe is mechanically hardened for extreme industrial environments.

Technical Specifications

Proximity System FAQ

What is the advantage of the 9.0 metre total length option?The 9.0 metre integrated cable allows the probe to reach the Proximitor sensor without an intermediate extension cable. This simplifies the installation, reduces the number of connection points (which are potential failure sites), and ensures the total system electrical length is perfectly matched for the 9m-calibrated Proximitor.

Can this probe handle high-pressure environments?Yes. The 330103 series is designed to seal differential pressure between the probe tip and the case using a high-grade Viton O-ring. This makes it suitable for installation in bearing housings where pressurized oil or gas is present.

What is the "ClickLoc" connector and why is it used?The ClickLoc is a specialized miniature coaxial connector that provides a positive "click" when fully engaged. This prevents the connector from backing out due to machine vibration and protects the signal integrity from moisture and oil ingress.

Engineering & Installation Guide

• Gap Calibration (Voltage Method): When installing the probe, use a calibrated voltmeter to measure the output of the Proximitor Sensor. For most 3300 XL systems, the probe should be physically adjusted (screwed in or out) until the output voltage reaches approximately -10 VDC, which typically represents the center of the probe's linear range.

• Cable Protection: Since this model is a standard cable (non-armored) version, ensure the 9.0-metre lead is routed through a protective conduit or secured with stainless steel cable ties. Avoid sharp bends; the minimum bend radius must be at least 25.4 mm (1.0 inch) to prevent internal coaxial damage.

• Target Material Alignment: Ensure the target area on the shaft is at least 16 mm (0.6 inch) in diameter (twice the probe tip diameter) to avoid "side-viewing" interference, which can cause non-linear vibration readings.

Engineering Advantages

The Bently Nevada 330103 stands out for its exceptional resistance to corrosion and chemical attack, thanks to its PPS and Stainless Steel construction. Its design ensures that the electrical properties remain stable even when the probe is submerged in hot lubrication oil. Furthermore, the 3300 XL series offers an improved linear range, which provides engineers with more "room" to set the initial gap without fearing that shaft movement will push the probe out of its accurate sensing zone. This "Made in U.S.A" component is a benchmark for reliability in the TSI (Turbine Supervisory Instrumentation) sector.