24701-28-05-00-038-04-02 Bently Nevada Stainless Steel Proximity Probe Housing Assembly
For Rotating Machinery Vibration Monitoring Systems
Engineered specifically for explosive hazard areas and highly corrosive offshore environments, the Bently Nevada 24701-28-05-00-038-04-02 explosion-proof housing assembly features a 303 stainless steel body, an internal pre-installed 3300 XL 8 mm proximity probe with multiple safety approvals, and a 3.8-inch penetration sleeve. Compared to basic aluminum alternatives, its rugged heavy-duty steel structure withstands severe marine weathering and high-velocity fluid exposure while fully complying with international explosion-proof standards. This makes it the ideal choice for conducting non-contact shaft vibration and thrust position measurements on critical assets like marine gas turbines, offshore oil pumps, and heavy-duty petrochemical compressors without halting production.
Engineer's Note
"The 24701-28-05-00-038-04-02 model is a popular option for standard bearing housing retrofits on steam turbines and process pumps because it ships as an all-in-one package containing both the housing and the pre-installed 3300 XL 8 mm probe (-28). Because it utilizes a 3.8-inch penetration sleeve (-038) with no standoff adapter (-00), please double-check your casing blueprint drawings before finalizing installation. Ensure that the distance from the outer surface of your machine connection block down to the targeted shaft surface lines up with this exact 3.8-inch depth. Since it comes equipped with a short 0.5-meter internal probe lead (-05), you must route an external 4.5-meter 330130 extension cable from the housing's terminal conduit out to your 330180 Proximitor to satisfy the required 5.0-meter system loop."
Frequently Asked Questions
Q: Can I replace or swap the internal 8 mm probe without taking the industrial machine offline?
A: Yes. The 24701 series housing features a unique reverse-mount configuration. By unscrewing the heavy outer dome cap, maintenance personnel can safely adjust the sensor's voltage gap or pull out the entire internal proximity probe for servicing while the machine shaft remains spinning at full velocity.
Q: Why choose the 24701 Stainless Steel housing over Bently Nevada's 21000 Aluminum model?
A: While the 21000 aluminum housing is lighter and more economical for standard inland facilities, aluminum is highly prone to galvanic oxidation and salt pitting. The 24701 stainless steel assembly is specifically mandated by oil majors for offshore production platforms, coastal power plants, and chemical washdown zones where aluminum would rapidly degrade.
Q: What does the "-04" fittings option mean for my field installation?
A: The -04 option specifies that the housing body's wiring port arrives with one 3/4-14 NPT threaded explosion-proof hex plug pre-installed. This allows you to securely lock and blind off an unused conduit run, protecting the inner electronics from moisture tracking, while utilizing the remaining open 3/4-14 NPT hole for your primary armored field conduit connection.
Field Project Case
Application: Main Oil Export Pump Vibration Loop Retrofit
Location: Offshore Floating Production Storage and Offloading (FPSO) Vessel
Deployment: Deployed to monitor severe radial shaft vibrations on a massive multi-stage crude oil transmission pump operating 24/7 under harsh marine weather. The engineering contractor specified the 24701-28-05-00-038-04-02 housing assembly to handle constant exposure to airborne saltwater mist and raw oil fumes. The 3.8-inch stainless steel sleeve successfully shielded the internal sensor from heavy oil spray inside the bearing box. Over several years of continuous service, the heavy-duty enclosure has kept the critical sensor dry, maintaining steady sub-micron measurement loops with zero false alarms or corrosion-related signal faults.
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