Bently Nevada 330904-XX-XX-10-02-CN (158268-00-34) 3300 NSv Proximity Probe

Product Overview

The Bently Nevada 330901-XX-XX-10-02-CN (Engineering Part Number 158268-00-34) is an eddy current proximity transducer belonging to the 3300 NSv series. The NSv (Narrow Side View) system is specifically designed for applications where standard 8 mm probes cannot be used due to physical space constraints or tight mounting clearances. It is predominantly used for vibration and position monitoring on small-diameter shafts or within machinery with restricted internal access, such as centrifugal compressors, high-speed pumps, and aeroderivative turbines.

This specific model features an M8 x 1 metric thread and is equipped with stainless steel armor for enhanced mechanical protection of the coaxial cable. The 1.0-metre total length assembly is terminated with a miniature coaxial ClickLoc connector. The "CN" suffix confirms adherence to country-specific hazardous area approvals, including NEPSI certification for the Chinese market. It provides a linear output when paired with a matched 3300 NSv Proximitor Sensor.

Technical Configuration

Ordering Information

Industrial procurement should reference both the model number and the engineering part number to ensure exact configuration matching.

Engineering & Installation Guide

Mounting and Clearance Requirements:

The 3300 NSv series is designed to reduce the "side-view" effect; however, a minimum clearance from surrounding metal is still required to maintain linearity. Ensure the probe tip is not recessed into the mounting bracket. For M8 x 1 threads, the recommended mounting torque is 4.5 N·m (40 in·lb) to prevent case distortion or thread damage.

Cable Protection (Armor):

This model is supplied with stainless steel armor. The armor protects the coaxial core from abrasion and crushing; however, it is not fluid-tight. In environments with heavy oil or chemical exposure, ensure the armored cable is further protected or routed such that liquids cannot migrate into the ClickLoc connector.

Grounding and Shielding:

Proper signal integrity relies on a single-point ground. The shield of the extension cable should be grounded at the Proximitor end (usually in the monitor rack or local junction box). Ensure the probe armor does not inadvertently ground at the machine casing if the system design requires isolated grounds.

Replacement Precautions:

The 158268-00-34 is a specific engineering configuration. When replacing an existing probe, verify the unthreaded and overall case length (marked as XX-XX in the ordering string) to ensure the probe tip reaches the target shaft without mechanical interference.

Maintenance & Troubleshooting FAQ

Q: Can the 3300 NSv probe be used with a standard 3300 XL Proximitor?

A: No. The 3300 NSv probe must be paired with a 3300 NSv Proximitor. The internal sensing coil and frequency response of the NSv series differ from the 3300 XL series, and mixing them will result in significant measurement errors.

Q: What is the purpose of the ClickLoc connector protector?

A: The protector prevents the miniature coaxial connector from loosening due to machine vibration and prevents environmental contaminants (dust/oil) from entering the signal path. It should always be installed and seated correctly.

Q: How do I handle unstable DC gap voltage?

A: Unstable gap voltage often indicates a loose connection at the ClickLoc junction or moisture ingress. Disconnect the cable, clean the contacts with an approved electronic cleaner, and dry thoroughly before reconnecting.

Q: What is the target material calibration?

A: Standard Bently Nevada proximity probes are calibrated for AISI 4140 steel. If the target shaft is a different alloy, the scale factor (V/mm) will change, requiring a software scale factor adjustment in the monitoring system.