148239-01-18-90-02 Bently Nevada 3300 XL 11mm Underwater Probe

Overview

The Bently Nevada 3300 XL 11mm Underwater Proximity Probe with part number 148239-01-18-90-02 delivers high-accuracy eddy current measurement in continuously submerged operating environments. Engineered for severe industrial service, this eddy current transducer detects shaft position and vibration on critical rotating machinery. The integrated Tefzel tubing shields the sensor cable against harsh fluid exposure, while the robust 304 Stainless Steel case provides structural integrity under extreme fluid pressure.

Core Functional Capabilities

• Submersible Case Design: Sealed probe housing resists continuous fluid ingress up to 34 bar (500 psi).
• Protective Tefzel Tubing: Outer conduit guards signal conductors from fluid contact and mechanical wear.
• ClickLoc Connector: Miniature coaxial connection provides secure locking to prevent unintended signal disconnection.
• Precise Signal Output: Delivers non-contact dynamic displacement readings for continuous vibration analysis.
• Hazardous Area Rating: Certified for Zone 0, Zone 2, and Class I Division 1/2 environments.

Technical Specifications

System Compatibility and Architecture Integration

• Extension Cable Interfacing: Connects directly to standard 3300 XL 11mm extension cables.
• Proximitor Sensor Alignment: Matches with 3300 XL 11mm Proximitor Sensors for calibrated 9.0-metre system lengths.
• Monitoring System Output: Feeds clean dynamic signals into Bently Nevada 3500 Series machinery protection racks.
• System Diagnostics: Supports continuous gap voltage reading and peak-to-peak vibration signal processing.

Installation Guidelines

• Mounting Thread: Screw probe body firmly using standard 5/8-18 UNF threaded ports.
• Connector Placement: Keep cable connector in a dry area. Never submerge the connector end.
• Fluid Selection: Deploy probe in fresh water, oil, or industrial fluids. Avoid direct salt-water exposure.
• Cable Routing: Maintain minimum bend radius on Tefzel tubing to protect internal coaxial conductors.
• Gap Setting: Set mechanical gap voltage using DC voltmeter during installation calibration.

Commissioning and Maintenance Efficiency

• ClickLoc Mechanism: Integrated lock prevents connection loosening without requiring special hand tools.
• Fast Gap Verification: Technicians quickly verify install depth via DC voltage reading at monitor rack.
• Rugged Conduit Sheathing: Tefzel jacket reduces field wear from turbine oils and mechanical abrasion.
• Simplified Swap-out: Calibrated standard scale factors allow direct unit replacement without system recalibration.

Hazardous Area Certifications

• Intrinsic Safety (ia): Class I, Zone 0: AEx/Ex ia IIC T5...T1 Ga
• Divisional Safety (ia): Class I, Groups A, B, C, D; Class II, Groups E, F, G; Class III
• Non-Incendive (nA, ec): Class I, Zone 2: AEx/Ex nA IIC T5...T1 Gc; Class I, Div 2, Groups A, B, C, D
• Barrier Requirement: Install with intrinsically safe zener barriers or galvanic isolators per drawing 141092.

Packaging Specifications and Warranty

• Package Contents: 1x Bently Nevada 148239-01-18-90-02 Probe, protective end caps, installation sheet.
• Warranty Term: Covered by full 12-month factory quality guarantee.
• Dispatch Time: Orders ship within 24 to 48 hours from warehouse stock.
• Logistics Partners: Fast global delivery via Express FedEx, UPS, and DHL routes.

Typical Application Scenarios

• Submerged Hydro Turbines: Continuous shaft vibration monitoring inside wet turbine housings.
• Boiler Feed Pumps: Thrust and radial position tracking inside high-pressure fluid casings.
• Industrial Gearboxes: Direct shaft displacement measurement under high oil splash conditions.
• Heavy Duty Compressors: Machine health tracking inside wet gas or fluid-flooded compressor stages.

Global PLC Spare HUB's Insight

Field experience shows that improper cable handling causes most premature proximity probe failures in wet areas. During a recent hydro turbine retrofit, our engineering team evaluated a recurring signal fault on an underwater bearing housing. The original probe failed because fluid entered the unsealed coaxial connector located inside a flooded conduit box.

Replacing the damaged unit with a Bently Nevada 148239-01-18-90-02 probe resolved the issue completely. We routed the 9.0-metre Tefzel armoring through a dedicated sealed junction head, keeping the ClickLoc connector completely dry outside the fluid zone. The 304 Stainless Steel case successfully withstood 18 bar continuous water pressure. Machine operators now receive stable vibration data without zero-drift errors.

Frequently Asked Questions and Selection Guide

Can I submerge the complete probe assembly including the cable connector?

No, you must never submerge the cable connector. While the probe head and Tefzel tubing handle continuous submersion, the connector end requires a dry environment.

Is this probe model suitable for offshore marine seawater applications?

No, the 304 Stainless Steel housing is not suitable for salt water. Salt water causes rapid pitting corrosion on 304 steel. Use specialized marine alloy probes for seawater environments.

How do I determine if I need the 9.0-metre total length version?

Select total cable length based on the distance between your probe tip and the Proximitor sensor location. The system length (probe plus extension cable) must equal the rated Proximitor length, typically 9.0 metres total.

What should I check if gap voltage reads out of normal range after installation?

First, inspect mechanical probe tip clearance. Next, check cable connections for moisture ingress. Finally, verify that your target shaft material matches the factory calibration target (AISI 4140 steel).

How do I select the right unthreaded length option for my bearing housing?

Measure your mounting port thickness. Choose an unthreaded length option (Option A) that prevents thread binding while allowing the probe tip to reach the required target distance safely.

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