Bently Nevada 330906-02-12-10-02-05 Reverse Mount Probe

Product Overview

The Bently Nevada 330906-02-12-10-02-05 3300 NSv reverse mount probe delivers non-contact displacement sensing in confined machinery spaces. This specialized probe features a reverse-mount configuration that allows installation from the machine’s interior side. It measures radial vibration and axial position in turbines, compressors, and generators. Maintenance teams select this probe when standard front-mount probes cannot access the measurement location. Its compact design and robust construction ensure reliable performance in demanding industrial environments.

Technical Specifications

The table below details the complete technical parameters for the Bently Nevada 330906-02-12-10-02-05 reverse mount probe.

Parameter	Specification
Product Type	Reverse Mount Proximity Probe (3300 NSv Series)
Compatibility	Bently Nevada 3300 and 3500 monitoring systems
Mounting Configuration	Reverse mount (interior installation)
Thread Size	3/4-20 UNF
Overall Probe Length	120 mm (tip to connector)
Thread Length	10 mm
Tip Material	Polyphenylene sulfide (PPS) with encapsulated coil
Case Material	316L stainless steel
Integral Cable Length	2 meters (6.6 feet)
Cable Jacket	High-strength fluoropolymer
Connector Type	6-pin female, gold-plated contacts
Coil Inductance	3.2 µH ±5% at 25°C
Weight	Approximately 0.55 kg
Operating Temperature	-51°C to +177°C
Storage Temperature	-55°C to +185°C

Design Features and Construction

Reverse Mount Configuration

The Bently Nevada 330906-02-12-10-02-05 employs a reverse-mount design that accesses the shaft from the machine interior. This configuration allows installation where external mounting points do not exist or prove inaccessible. The probe extends through the bearing housing from the inside outward. Consequently, you can install this probe without modifying existing machine casings or brackets.

Probe Tip and Sensing Element

A PPS tip encapsulates the precision induction coil at the probe’s sensing face. This material provides outstanding chemical resistance and thermal stability in oil-mist environments. The coil maintains a stable inductance value of 3.2 microhenries across the entire operating temperature range. This stability ensures accurate gap measurements in high-vibration applications.

Mechanical Dimensions and Mounting

This probe measures 120 millimeters from the sensing tip to the connector termination. It features a 10-millimeter threaded section with standard 3/4-20 UNF threads. The 316L stainless steel case protects the internal components from corrosion and mechanical stress. At approximately 0.55 kilograms, the Bently Nevada 330906-02-12-10-02-05 places minimal additional weight on the mounting structure.

Cable Assembly and Environmental Protection

A 2-meter integral fluoropolymer-jacketed cable extends from the probe body for system interconnection. This cable provides sufficient length for routing to junction boxes or extension cables. Gold-plated 6-pin connectors at the cable end ensure low-resistance, corrosion-free contacts. The probe operates reliably from -51°C to +177°C, making it suitable for both steam turbine and gas compressor applications.

Installation and Application

Installing the Bently Nevada 330906-02-12-10-02-05 requires accessing the machine interior to thread the probe into the reverse-mount bracket. You must set the probe gap according to the system configuration to achieve proper proximitor output. This probe supports radial vibration monitoring in bearing housings where external access proves difficult or impossible.