Bently Nevada 330881-BR-04-70-03-02 PROXPAC XL Proximity Transducer Assembly

Brief Product Description

This self-contained proximity transducer assembly measures shaft vibration and axial position on critical rotating machinery. It integrates an 8 mm eddy current probe directly with the sensor electronics to eliminate external extension cables.

Product Overview

The Bently Nevada 330881-BR-04-70-03-02 PROXPAC XL assembly functions as a critical component within Turbo-machinery Instrumentation (TSI) systems. By integrating a 3300 XL 8 mm eddy current probe directly with its internal sensor electronics, this hardware effectively eliminates the requirement for a separate extension coaxial cable. Consequently, plant operators can run field wiring directly from the transducer housing to the control room monitors. This streamlined architecture inherently reduces intermediate connection failure points and simplifies overall installation in tight spaces.

Engineering teams specify this device to withstand hazardous, high-temperature, and corrosive chemical exposures. The outer housing consists of high-performance glass-reinforced Polyphenylene Sulfide (PPS). This conductive thermoplastic provides structural strength equivalent to traditional metal enclosures while preventing static electricity accumulation. This specialized material choice ensures reliable signal transmission without risk of corrosion or degradation over extended operational life cycles.

Configuration Breakdown and Option Specifics

The alphanumeric part number corresponds to specific physical variables and electrical certifications required for heavy industrial applications.

• Probe Option (-BR): Identifies the integrated 3300 XL 8 mm probe configuration optimized for standard target materials.
• Standoff Adapter Option (-04): Denotes a 40 mm fixed anodized standoff distance to clear external machine casings.
• Probe Penetration Option (-70): Indicates a 70 mm insertion depth into the bearing housing to safely reach the shaft target area.
• Fittings Option (-03): Supplies one 3/4-14 NPT conduit fitting along with a 3/4-14 to 1/2-14 NPT stainless steel reducer and plugs.
• Mounting Thread Option (-02): Designates standard imperial mounting configurations for secure mechanical anchoring.

Technical Specifications

This reference list contains the baseline physical and performance criteria for the specific 330881 asset monitoring package.

• Manufacturer: Bently Nevada (Baker Hughes)
• Model Designation: 330881-BR-04-70-03-02
• System Family: 3300 Series / 3300 XL Environment
• Core Enclosure Material: Glass-Fiber Reinforced Conductive Polyphenylene Sulfide (PPS)
• Sensor Core Diameter: 8 mm (Millimeter) Probe Element
• Measurement Target Matrix: AISI 4140 Low-Alloy Steel (Standard Calibration)
• Installation Interface: Direct Field Wiring Terminals (No Intermediate Coaxial Extension Required)
• Net Hardware Weight: 0.06 kg (Kilograms)

Primary Applications

Maintenance departments install this consolidated sensor assembly across multiple industrial machine trains.

• Fluid-Film Bearing Monitoring: Capturing high-frequency radial vibration on steam turbines, centrifuges, and large cooling pumps.
• Thrust Collar Displacement: Tracking axial shaft positioning inside high-pressure gas compressors to protect against internal rotor contact.
• Phase Angle Reference: Utilizing localized shaft notches to deliver accurate phase timing data back to diagnostic balancing software.
• Industrial Asset Protection: Providing continuous machinery health inputs directly into distributed control systems (DCS) or safety PLC racks.