Bently Nevada 330171-04-12-05-02-CN 3300 5 mm Proximity Probe

Product Overview

The 330171-04-12-05-02-CN is a high-precision eddy current sensor engineered for confined industrial spaces where standard 8 mm probes cannot be utilized. As a core component of the Bently Nevada 3300 5 mm Proximity Transducer System, this 330171-04-12-05-02-CN probe provides critical non-contacting measurements of vibration and shaft position. It is extensively applied in the aerospace, power generation, and petrochemical industries to monitor small high-speed turbomachinery and internal clearance on complex bearing assemblies. By delivering reliable data on radial vibration and axial thrust, this probe serves as an early warning system against mechanical fatigue, preventing catastrophic failures and ensuring the operational continuity of high-speed rotating assets in high-pressure environments.

Suffix Breakdown

The specific mechanical dimensions and regional compliance of the 330171-04-12-05-02-CN are determined by its unique suffix configuration:

• 330171: Base series for the 3300 5 mm Proximity Probe with 1/4-28 UNF threads.

• -04 (Unthreaded Length): Features a 0.4 inch unthreaded portion at the probe tip for specific mounting bracket offsets.

• -12 (Overall Case Length): Specifies a compact 1.2 inch overall case length, ideal for tight installation envelopes.

• -05 (Total Length): Indicates a 0.5 meter (1.6 feet) total electrical cable length.

• -02 (Connector Option): Equipped with a miniature coaxial ClickLoc connector and standard cable configuration for reliable signal transmission.

• -CN (Agency Approvals): Mandatory China-specific approvals. This unit is fully certified for hazardous area use within the Chinese market, adhering to NEPSI and CCC (China Compulsory Certificate) standards under the GB 3836 framework.

Technical Specifications

Technical FAQs

Why choose a 5 mm probe over an 8 mm probe?

The 5 mm probe is specifically designed for applications where physical space is limited. While it has a smaller linear range than the 8 mm version, its smaller footprint allows it to be mounted in narrow bearing housings or used to monitor smaller shaft diameters where an 8 mm tip would suffer from side-viewing interference.

What is the significance of the -CN suffix?

The -CN suffix ensures the product is legally compliant for installation in hazardous (Ex) zones within China. It confirms the hardware meets NEPSI and CCC certification requirements, which are mandatory for explosion-proof safety in Chinese industrial facilities.

Is this probe compatible with FluidLoc cables?

This specific model (Option 02) uses a standard cable. If your application involves high-pressure oil or fluid wicking concerns, please consult our technical team to verify if a FluidLoc upgrade (typically Option 11 or 12) is required for your installation.

Engineering & Installation Guide

Gap Calibration and Sensitivity

The 3300 5 mm system has a narrower linear range than the 8 mm system. During installation, it is vital to gap the probe accurately using a voltmeter connected to the Proximitor. The center of the linear range typically corresponds to -10.0 VDC. Given the smaller target area, ensure the probe is perfectly perpendicular to the shaft surface to avoid sensitivity errors or nonlinear readings.

Mounting and Thread Integrity

Due to the smaller 1/4-28 UNF thread size, the 330171-04-12-05-02-CN is more susceptible to damage from over-torquing compared to larger probes. Do not exceed a mounting torque of 5.1 Nm (45 in-lb). Always use a thread lubricant that is compatible with your operating temperature and environment to prevent galling, especially in stainless steel housings.

Side-View Clearance

A 5 mm probe requires a smaller "clearance hole" than an 8 mm probe, but it still needs an unobstructed view of the target. Ensure there are no metallic objects within a 5 mm radius of the probe tip (except for the target shaft). Proximity to the sides of a mounting hole can cause "side-viewing," which artificially shifts the gap voltage and compromises the accuracy of the vibration data.