Bently Nevada 330101-00-25-10-02-00 | 3300 XL 8 mm Proximity Probes, Metric

Product Overview

The Bently Nevada 330101-00-25-10-02-00 is an 8 mm eddy current proximity probe belonging to the 3300 XL series. This transducer is designed for non-contacting displacement and vibration measurements in critical machinery protection systems (TSI). It is a standard component of the 3300 XL Proximity Transducer System, used to monitor radial shaft vibration, axial position, and speed on high-speed rotating equipment such as steam turbines, centrifugal compressors, and motors.

This specific configuration utilizes a 3/8-24 UNF thread with a 2.5-inch overall case length and is supplied without stainless steel armor. The assembly features a 1.0-metre (3.3 feet) integral cable terminated with a miniature coaxial ClickLoc™ connector. It provides a linear range of 2.0 mm (80 mils) and a standard scale factor of 7.87 V/mm (200 mV/mil) when paired with the corresponding 3300 XL Proximitor sensor and extension cable.

Technical Configuration

Ordering Information

This assembly is defined by its alphanumeric suffix codes. Procurement and engineering teams must verify all parameters to ensure mechanical fit and electrical compatibility with the system loop.

Engineering & Installation Guide

System Loop Integrity:

The 3300 XL 8 mm probe is a component of 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 length will cause significant scale factor errors and non-linearity.

Mechanical Installation:

When installing the 3/8-24 UNF threads, do not exceed the maximum torque of 13.5 N·m (120 in·lb). Over-torquing can lead to case distortion or internal sensing coil damage. For radial vibration monitoring, ensure the probe tip has a minimum side clearance of 13 mm (0.5 in) from surrounding metallic surfaces to prevent signal interference.

Field Wiring and Grounding:

The ClickLoc™ connector must be kept clean and dry. In oil-mist environments, it is mandatory to use a connector protector or silicone heat-shrink tubing to prevent lubricant ingress. The coaxial cable shield should be grounded only at the monitor/Proximitor end to prevent ground loops that introduce 50/60 Hz noise into the signal.

Replacement Precautions:

When replacing legacy 3300 probes (non-XL) with 3300 XL series probes, verify the Proximitor sensor is also upgraded to the 3300 XL series. While physically compatible, the XL series has a different temperature compensation profile and scale factor stability.

Maintenance & Troubleshooting FAQ

Q: Can this 1.0m probe be used as a standalone sensor?

A: No. A 1.0-metre probe is designed to connect to an extension cable. The Proximitor sensor requires the total loop impedance of the specified system length (5m or 9m) to function.

Q: What indicates a faulty ClickLoc connection?

A: High-frequency "spiking" or an unstable DC gap voltage typically indicates a loose or contaminated coaxial connection. Clean the contacts with an approved electronic cleaner and ensure the connector is dry.

Q: How do I verify the DC gap voltage for a 3300 XL system?

A: For most applications, the nominal mid-range gap is 1.27 mm (50 mils), which corresponds to approximately -10.0 Vdc at the Proximitor output terminal.

Q: What is the impact of target material on calibration?

A: Standard probes are calibrated for AISI 4140 steel. If the target shaft is a different alloy, the scale factor will change, requiring a Material Correction Factor (MCF) adjustment in the monitoring software.