Product Overview

The Bently Nevada 31000-28-10-00-235-00-02 Proximity Probe Housing Assembly serves as a fundamental protective interface for critical machinery transducers. This heavy-duty explosion-proof enclosure allows for the external mounting and precise gap adjustment of proximity probes without the need to shut down equipment or remove machine covers.

Designed for high-reliability applications in power generation and oil and gas sectors, this housing shields sensitive 3300 XL probes from harsh mechanical impacts, extreme thermal cycles, and corrosive contaminants. Its primary role in a Turbine Supervisory Instrumentation (TSI) suite is to maintain mechanical stability for displacement measurements, ensuring the Bently Nevada 3500 system receives high-fidelity data for vibration analysis and emergency shutdown logic. By utilizing this assembly, operators gain the ability to perform online maintenance and calibration, directly enhancing plant availability and asset safety.

Configuration Analysis and Suffix Mapping

The 31000 series utilizes a specific coding structure to match mechanical casing requirements and hazardous area safety standards:

Probe Type and Sleeve Interface

The "28" and "10" designations define the internal probe sleeve diameter and the compatibility with the probe's thread size. This specific configuration is optimized for standard 8mm or 5mm proximity probes, providing a rigid, centered mount for the transducer.

Hazardous Area Approval

The "00" option indicates standard explosion-proof/flame-proof certifications, such as CSA or ATEX. This ensures the housing acts as a certified safety barrier when installed in Class I, Division 1 or Zone 1 environments where explosive gases are a constant operational risk.

Depth and Porting Selection

The "235" suffix specifies an extended total sleeve length of 235mm, ideal for machines with thick insulation or deep casing access requirements. The "00" and "02" options finalize the conduit port threads (typically 3/4-14 NPT) and the specific mounting base configuration for seamless integration with the machine wall.

Mechanical and Environmental Parameters

Field Commissioning and Setup

Precision installation is mandatory to ensure the accuracy of your vibration monitoring loop:

External Gap Adjustment

The 31000 series permits gap calibration while the machine is running. Technicians should monitor the DC bias voltage at the Proximitor. For a standard 3300 XL 8mm probe, rotate the housing sleeve until the voltmeter reads -10.0 Vdc, representing the center of the linear monitoring range.

Thread and Seal Protection

Apply an industrial-grade, non-hardening thread lubricant to the housing-to-machine threads. This prevents galling and ensures an oil-tight seal against internal machine pressures, while also facilitating future removal for inspection.

Grounding Continuity

Ground the housing assembly to the machine casing via the external grounding lug. This prevents the housing from acting as an antenna for EMI/RFI noise, which can otherwise introduce false spikes into the DCS or 3500 system vibration plots.

Industrial Environmental Resilience

The 31000-28-10-00-235-00-02 thrives in high-stress environments where thermal expansion is a factor. It maintains a stable mechanical reference for the probe even during rapid steam turbine startup cycles. It integrates perfectly with Honeywell Experion PKS and Bently Nevada System 1, providing the physical stability required for high-resolution orbit analysis and shaft centerline tracking in extreme industrial conditions.

Ordering info

• Bently Nevada 31000 Series Probe Housing Main Body.

• Extended 235mm Internal Probe Sleeve Assembly.

• Explosion-proof conduit entry plugs and seals.

• Viton O-ring and machine interface gasket kit.

• Factory Test Certificate and Compliance Data Sheet.

• Quick-start Installation and Safety Guide.

• Note: Transducer Probes and Extension Cables are sold separately.

Logistics and Handling

We prioritize rapid delivery to minimize maintenance windows and avoid project delays.

• Shipping Lead Time: 3-5 days when payment finish via priority airfreight.

• Logistics Network: Global fulfillment through DHL, FEDEX, or UPS.

• Package Integrity: Every unit is vacuum-sealed in moisture-barrier bags and encased in multi-layered, shock-absorbent industrial foam to guarantee the precision sleeve remains perfectly true during transit.

Technical Consultation FAQs

Q1: What is the benefit of the 235mm sleeve length?

A1: This extended length is specifically designed for large steam turbines or insulated compressors where the probe must pass through a significant distance of outer casing or thermal insulation to reach the shaft.

Q2: Is the housing oil-tight?

A2: Yes, the 31000 series utilizes high-performance O-ring seals designed to prevent machine oil or synthetic lubricants from leaking into the conduit system or the environment.

Q3: Can I use this housing for thrust position probes?

A3: Absolutely. It is the industry standard for both radial vibration and axial thrust position measurements, providing the rigid mounting required for sub-mil displacement accuracy.

Q4: Does the "00" option include ATEX certification?

A4: Typically, the "00" suffix covers North American CSA standards. For specific ATEX/IECEx requirements, we recommend verifying the local certification labels on the housing body or consulting our technical team prior to installation.