Product Overview

The Bently Nevada 31000-28-05-20-110-00-02 Housing Assembly provides critical mechanical and environmental protection for proximity transducer systems. Specifically engineered for the 3300 XL series, this explosion-proof housing serves as the primary interface between the machine's internal environment and the external monitoring network. It effectively shields sensitive probes from corrosive oil mists, high humidity, and physical impacts common in turbomachinery applications. In high-stakes environments like petrochemical refineries and power generation plants, this housing ensures that displacement and vibration signals remain uncompromised, facilitating accurate data transmission to 3500 series racks or integrated DCS platforms. Its robust construction minimizes mechanical resonance and maintains probe alignment under extreme thermal cycles.

Suffix Architecture & Configuration Logic

The 31000 series utilizes a detailed suffix system to define its mechanical dimensions and safety certifications, ensuring a precise fit for specific bearing housings.

Unthreaded Length (-28)

Specifies an unthreaded length of 2.8 inches. This parameter allows the probe to sit at the correct depth within the machine casing while maintaining structural rigidity.

Overall Case Length (-05)

Defines a total case length of 0.5 inches (adjusted for specific mounting depth), ensuring the assembly remains flush or properly recessed according to engineering drawings.

Standoff Adapter (-20)

Indicates the inclusion of a 2.0-inch standoff adapter. This component provides necessary clearance for insulation or external mounting hardware on the machine casing.

Probe Penetration (-110)

Designates a probe penetration depth of 11.0 inches. This ensures the probe tip reaches the target shaft surface accurately across large bearing pedestals.

Fittings Option (-00)

Configured with standard NPT conduit fittings, facilitating seamless integration with existing industrial wiring and explosion-proof conduits.

Agency Approval (-02)

Certified for hazardous area locations with ATEX/IECEx and North American approvals. This ensures compliance with global safety standards for explosive atmospheres.

Physical & Functional Parameters

Field Implementation Strategy

Optimal signal accuracy requires the probe to be gapped correctly before sealing the housing. Engineers should utilize a digital multimeter to confirm the gap voltage—typically -10.0 Vdc for a 3300 XL system—before finalizing the installation. Ensure all O-rings are lubricated with system-compatible grease to maintain the IP66 ingress protection rating. When routing cables through the housing, maintain a minimum bend radius of 25.4mm (1 inch) to prevent internal conductor fatigue. Proper grounding of the housing to the machine casing is mandatory to eliminate electromagnetic interference (EMI) that could induce noise into the vibration signal.

Industrial Reliability & Integration

The 31000-28-05-20-110-00-02 housing is built to endure the harshest "under-the-hood" conditions. Its corrosion-resistant finish prevents degradation in hydrogen-cooled generators or ammonia-rich environments. The assembly’s thermal coefficient is matched to industrial turbine casings, preventing "probe drift" during machine heat-up phases. It integrates flawlessly with Turbine Supervisory Instrumentation (TSI) loops and provides the mechanical stability required for high-fidelity vibration data used by Honeywell Experion PKS or other advanced predictive maintenance systems.

Logistics and Dispatch

Delivery time: 3-5 days when payment finish, BY DHL/FEDEX/UPS.

All units are shipped in anti-static industrial packaging to protect the internal seals and thread integrity. Each shipment includes a factory-issued certificate of conformance to verify accuracy and safety ratings.

Site Engineering FAQs

Q1: Can this housing be used with a 3300 XL 5mm probe?

A1: Yes, provided the correct internal sleeve and bushing are used. However, the 31000 series is most commonly optimized for 8mm and 11mm systems to ensure maximum stability.

Q2: What is the significance of the "Standoff Adapter" suffix?

A2: The standoff adapter allows the housing to clear machine insulation or external obstructions. If your machine has thick thermal lagging, a longer standoff (-20 or higher) is required to ensure the housing head is accessible.

Q3: Is this housing rated for saltwater environments?

A3: The anodized aluminum construction offers excellent resistance, but for direct offshore/marine exposure, we recommend the stainless steel housing variant to prevent long-term galvanic corrosion.