Product Overview

The Bently Nevada 31000-28-10-00-146-00-02 serves as a high-precision Proximity Probe Housing Assembly, specifically engineered for the 3300 XL 8mm proximity transducer system. This assembly facilitates the external mounting of probes through machine casings, enabling critical radial vibration, thrust position, and Keyphasor measurements without requiring a machine shutdown for maintenance. Its primary value lies in its ability to provide a pressure-sealed, ruggedized environment for sensitive sensors in high-stakes industrial applications such as steam turbines, centrifugal compressors, and large-scale motors. By implementing this housing, plant operators ensure continuous machinery protection and high-fidelity signal transmission to the 3500 Monitoring System or integrated DCS, maximizing uptime and safety in compliance with API 670 standards.

Mechanical Option Configuration

The 31000 series utilizes a specific alphanumeric suffix code to define its physical dimensions and hardware compatibility. The 31000-28-10-00-146-00-02 configuration decodes as follows:

Suffix Logic Breakdown

• -28 (Unthreaded Standoff): Specifies a 2.8-inch unthreaded standoff length for probe clearance.

• -10 (Standoff Length): Indicates a 1.0-inch standoff adapter length.

• -00 (Probe Penetration): Configured for 0.0 inches of additional probe penetration (standard depth).

• -146 (Fittings Option): Includes specialized 3/4-14 NPT explosion-proof fittings designed for hazardous area conduit systems.

• -00 (Mounting Thread): Standard 3/4-14 NPT mounting threads for machine case interface.

• -02 (Probe Option): Internal sleeve and seal assembly specifically machined for the 3300 XL 8mm Proximity Probe.

Hardware Specifications

Field Commissioning Protocol

During the installation of the 31000-28-10-00-146-00-02, maintenance personnel must ensure the probe tip is correctly gapped relative to the target shaft. We recommend using a digital multimeter to set the "Gap Voltage" to the standard -10.0 Vdc (linear midpoint) before locking the probe sleeve. All NPT threaded connections must be treated with a high-temperature thread sealant to maintain the pressure-tight integrity of the machine casing. Furthermore, ensure the extension cable is secured within the housing with a minimum bend radius of 25.4mm to prevent internal wire fatigue or signal attenuation caused by high-frequency machinery vibration.

System Integration Advantages

This housing assembly provides an impenetrable barrier against environmental contaminants such as lubricating oil, moisture, and dust, which can degrade sensor performance. Its robust mechanical design prevents housing resonance from interfering with high-speed vibration data, ensuring that the 3500/42M Proximitor cards receive clean, accurate displacement signals. This reliability is essential for integration into Plantwide Asset Management software and high-availability DCS architectures like Honeywell Experion PKS, where false trips or missed alerts represent significant financial risks.

Procurement & Package Contents

Each 31000-28-10-00-146-00-02 order is fulfilled with the following components:

• Primary Proximity Probe Housing Body.

• Internal Probe Sleeve and Adjustable Locknuts.

• Explosion-proof 3/4-14 NPT Conduit Fittings (Option -146).

• High-temperature O-ring kit and sealing gaskets.

• Original Factory Calibration/Verification Certificate.

• Please note: The Proximity Probe and Extension Cable are sold separately.

Global Logistics & Fulfillment

We maintain a global logistics network to ensure your critical instrumentation reaches the site without delay.

• Delivery Lead Time: 3-5 business days upon payment confirmation.

• Shipping Method: Global express priority via DHL, FEDEX, or UPS.

• Industrial Packaging: Units are shipped in original, factory-sealed anti-static industrial packaging. We utilize double-wall corrugated boxing and high-density foam inserts to guarantee the mechanical precision of the housing remains intact during international transit.

Technical Knowledge Base

Q1: Can I use this housing for a 11mm probe system?

A1: No. The -02 suffix specifies the internal machining and sleeve for the 8mm 3300 XL system. An 11mm probe has a larger diameter and would require the -03 probe option housing.

Q2: What is the benefit of the -146 fittings option?

A2: The -146 option provides explosion-proof 3/4-14 NPT conduit fittings. This is a critical requirement for installations in hazardous zones (Class I, Div 1 or ATEX Zone 0/1) where electrical sparking must be contained within the conduit system.

Q3: How do I adjust the probe gap without shutting down the machine?

A3: This is a primary feature of the 31000 series. By loosening the external locknuts on the sleeve, you can slide the probe closer to or further from the target shaft while monitoring the Proximitor output voltage, all while the machine is under load.

Q4: Is the housing resistant to corrosive oil additives?

A4: Yes. The anodized aluminum body and stainless steel internals are specifically selected to resist the aggressive chemical additives found in modern synthetic lubricating and hydraulic oils.