Bently Nevada 330101-00-25-10-02-CN 3300 XL 8 mm Proximity Probe

Product Overview

The Bently Nevada 330101-00-25-10-02-CN is a high-precision 8 mm eddy current proximity probe, a core component of the 3300 XL Transducer System. This system is designed for non-contacting displacement measurements on critical rotating machinery, providing vital data for vibration monitoring, radial position, and axial thrust analysis. It is fully compliant with API 670 standards for machinery protection.

This specific configuration features a 3/8-24 UNF thread, a 2.5-inch overall case length, and is supplied without stainless steel armor. The assembly includes a 1.0-metre (3.3 feet) integral cable terminated with a miniature coaxial ClickLoc connector. The "CN" suffix denotes country-specific agency approvals, primarily NEPSI, for hazardous area installations within the People's Republic of China. When integrated into a complete loop with a 3300 XL extension cable and Proximitor sensor, it delivers a linear scale factor of 7.87 V/mm (200 mV/mil).

Technical Configuration

Ordering Information

Accurate identification of the probe configuration is essential for system compatibility. The part number 330101-00-25-10-02-CN is derived from the following option codes:

Engineering & Installation Guide

Loop Calibration and Total Length:

The 3300 XL 8 mm probe is an inductive component within a tuned resonant circuit. This 1.0-metre probe must be paired with an extension cable to reach the required total system length (typically 5.0 or 9.0 metres) as calibrated for the Proximitor sensor. Using a mismatched total loop length will cause significant scale factor errors and zero-point drift.

Mechanical Mounting Clearances:

To ensure a linear output and prevent "side-view" interference, a minimum side clearance of 13 mm (0.5 in) from metallic surfaces must be maintained around the probe tip. If installing through a mounting bracket, ensure the bracket is rigid enough to avoid resonance frequencies within the machine's operating range.

Gap Setting and Voltage:

The probe should be gapped at the electrical center of its linear range. For a 3300 XL system, the nominal mid-range gap is 1.27 mm (50 mils), which typically corresponds to a DC voltage output of -10.0 Vdc at the Proximitor sensor's "OUT" terminal.

Environmental Protection:

The ClickLoc coaxial connector is sensitive to moisture and lubricant ingress. In oil-mist environments (common in bearing housings), it is mandatory to use the connector protector or oil-resistant heat-shrink tubing to prevent signal "spiking" or low insulation resistance faults.

Maintenance & Troubleshooting FAQ

Q: Can this probe be used with a legacy (non-XL) 3300 Proximitor?

A: While physically compatible, the 3300 XL series has a different temperature compensation profile and scale factor stability. For maximum accuracy and API 670 compliance, always match 3300 XL probes with 3300 XL Proximitors.

Q: What indicates a faulty ClickLoc connection?

A: High-frequency noise or intermittent "Not OK" status in the vibration monitor often indicates a loose or contaminated coaxial connection. Inspect the center pin for continuity and ensure the junction is dry.

Q: How do I handle a "Material Error"?

A: Standard probes are calibrated for AISI 4140 steel targets. If the target shaft is a different alloy, the scale factor (V/mm) will change. This requires a software-based scale factor adjustment or a Material Correction Factor (MCF).

Q: Is the "CN" approval functionally different from standard approvals?

A: No. The "CN" suffix ensures the unit carries the NEPSI markings required by Chinese regulatory authorities for explosive atmospheres. The electrical and mechanical performance remains identical to standard 3300 XL probes.