24701-28-05-00-040-04-02 Bently Nevada 3300 XL Probe Assembly

Product Overview

The Bently Nevada 24701-28-05-00-040-04-02 is a premium, rugged proximity probe housing assembly engineered for critical machinery protection systems. Combining a reverse-mount 3300 XL 8mm eddy current sensor with a robust environmental enclosure, this assembly facilitates precise non-contact shaft vibration and position monitoring. Weighing 1.8 kg (4.1 lbs) without fittings, the high-grade assembly allows safe, on-the-fly probe adjustments and replacements inside hazardous or high-pressure machine environments.

Core Technical Advantages

• Dual Stainless Steel Armor: Formed with a 303 stainless steel body and a 304 stainless steel sleeve to deliver superior defense against chemical exposure, severe oxidation, and mechanical friction.
• External Maintenance Optimization: Uses a specialized reverse-mount setup that permits swift replacement or mechanical recalibration of the probe sensor from outside the turbine or compressor casing.
• Direct NPT Process Mounting: Features a 3/4-14 NPT direct-threading profile alongside a single 3/4-14 NPT plug fitting to support clean, tight conduit connections and simplified integration into standard field configurations.

Technical Specifications

Installation & Engineering Guide

• Process Port Mounting: Apply an approved thread seal onto the 3/4-14 NPT mounting threads. Drive the 1.8 kg housing assembly smoothly into the machine case port, taking care not to nick the 4-inch stainless steel sleeve during insertion.
• Sensing Gap Calibration: Thread the internal reverse-mount 8mm probe through the sleeve. Connect a digital voltmeter to the corresponding Proximitor monitor output loop to verify the DC gap voltage baseline matches engineering specs before locking the assembly cover.
• Conduit Integration & Sealing: Guide the 0.5-meter high-flex cable out through the dual-threaded NPT ports. Tighten the dome cover over the internal protective O-rings completely to activate a tough environmental barrier and shield the sensor connection from pooling oil or fluids.

Technical FAQs

Q1: What advantage does the reverse-mount probe option bring to this housing assembly?
A1: A reverse-mount configuration enables maintenance personnel to install, gap, and replace the 3300 XL 8mm probe sensor directly from the outside of the machine chassis without dismantling the primary housing sleeve or shutting down the main fluid casing.

Q2: Why is the installation clearance dimension of 13.5 inches critical?
A2: The 13.5-inch (34.3 mm) dimension dictates the total physical clearance envelope required to fully unthread and draw the housing and internal probe straight out from the machine body during inspection cycles.

Q3: What core structural parts are supplied with this standard assembly group?
A3: The complete factory package consists of a robust machined dome cover, heavy-duty body with threaded conduit ports, an option-matched probe sleeve, high-temperature O-rings, a reverse-mount proximity probe, a thread seal, and a 3/4-14 NPT plug fitting.