27482-00-28-36 Bently Nevada Radiation Resistant Probe Unit

Overview

The 27482-00-28-36 is an engineered proximity transducer built by Bently Nevada specifically for severe nuclear and high-radiation containment areas. Part of the Radiation Resistant Probes series, this ruggedized measurement unit withstands intense gamma and neutron flux fields that would cause standard commercial sensors to degrade. Featuring specialized mineral-insulated cabling and robust mechanical construction, it delivers continuous, high-accuracy relative vibration and shaft position monitoring inside nuclear reactor coolant pumps and containment turbine shafts.

Part Number & Configuration Breakdown (27482-AA-BB-CC)

• Base Model (27482): Radiation Resistant Proximity Probe Platform
• Option A (-00): Unthreaded Length Option — 0 mm unthreaded barrel extension
• Option B (-28): Overall Case Length Option — 2.8 inches total thread and barrel length with 3/8-24 UNF threading and 5/16-inch wrench flats
• Option C (-36): Total Electrical Length Option — 36 inches (0.91 meters) integral radiation-resistant cable assembly complete with protective stainless steel armor
• Brand: Bently Nevada
• Series: Radiation Resistant Probes
• Condition: New & Original in Factory Packing

Technical Specifications Matrix

1. Mechanical & Dimensional Construction

• Thread Profile: 3/8-24 UNF standard thread pitch
• Unthreaded Barrel Length: 0 mm (0.300 inch probe tip diameter profile)
• Wrench Flats: 5/16 inch for precise torque application during installation
• Armor Protection: Heavy-duty flexible stainless steel armor shielding the integral cable against physical crushing and radiation-induced sheath embrittlement

2. Electrical & Metrology Performance

• Total Electrical Length: 36 inches (0.91 meters) matched coaxial configuration
• Signal Compatibility: Operates seamlessly with specialized radiation-resistant Proximitor sensors and standard monitoring architectures
• Linear Operating Range: Calibrated for precise eddy-current displacement feedback over standard gap intervals

3. Environmental & Radiation Tolerance

• Radiation Thresholds: Engineered to maintain signal integrity and dielectric insulation properties under high cumulative gamma and neutron radiation doses typical of nuclear containment zones.
• Thermal Endurance: Designed to withstand elevated ambient temperatures found near primary nuclear coolant loops.

Installation & Wiring Guidelines

• Torque Control: Utilize the integrated 5/16-inch wrench flats with a calibrated torque wrench to prevent over-tightening and protect the internal glass-to-metal hermetic seals.
• Armor Routing: Maintain smooth sweep radiuses along the stainless steel armored cable run to prevent localized stress concentration and protect the mineral-insulated core from micro-fractures.
• Grounding Integrity: Ensure the metallic armor and shield drain wires are terminated correctly at the instrument rack to block electromagnetic interference (EMI) in high-voltage reactor environments.

Diagnostic Capabilities & Fault Monitoring

• DC Gap Voltage Verification: Track the steady-state output voltage via control room instrumentation to verify correct mechanical clearance between the probe tip and the vibrating shaft.
• Insulation Resistance Testing: Perform periodic megohmmeter checks on the armored cable assembly to detect moisture ingress or radiation-induced breakdown of the internal dielectric barrier.

Global PLC Spare HUB's Insight & Expert Guidance

Global PLC Spare HUB's Insight emphasizes that radiation-resistant installations leave zero margin for component mismatch. When deploying the 27482-00-28-36, verify that your entire loop—including extension cables and Proximitor units—is rated for nuclear-grade service, as standard commercial components will experience rapid insulation failure under continuous radiation exposure.

Compatible Equipment & Target Application Scenarios

• Compatible Equipment: Bently Nevada radiation-resistant Proximitor sensors, specialized extension cables, and 3500 Machinery Protection System nuclear-qualified input cards.
• Target Application Scenarios: Pressurized water reactor (PWR) and boiling water reactor (BWR) primary coolant pumps, nuclear turbine generator bearings, and high-radiation radioactive waste handling machinery.

Logistics, Fulfillment & Warranty Protection

• Shipping Carriers: Express global dispatch via FedEx, UPS, and DHL.
• Fulfillment Speed: Guaranteed processing and dispatch within 24 to 48 hours.
• Warranty Terms: Fully backed by a 12-month factory replacement or repair warranty.

Professional Frequently Asked Questions

Why is special mineral-insulated cable and armor required for the 27482-00-28-36 probe?

Standard organic cable insulation degrades, hardens, and cracks when exposed to nuclear radiation; the mineral-insulated core and stainless steel armor ensure long-term structural and electrical survival inside containment.

Can this radiation-resistant probe be used with standard commercial Proximitor sensors?

No, radiation-resistant systems utilize specialized electrical matching and components; pairing this probe with standard commercial units will disrupt the calibrated scale factor and system linearity.

What precautions should be taken when bending the armored cable during installation?

Avoid sharp bends or kinks near the probe back-end; always adhere to a generous minimum bend radius to prevent internal conductor deformation inside the mineral insulation.

What are the best selection guidelines when replacing nuclear-grade vibration sensors?

Always match the exact part number string—including the unthreaded length (-00), case length (-28), and electrical length (-36)—to ensure proper physical fit and electrical tuning inside existing penetrations.

What causes an erratic baseline signal on a radiation-resistant monitoring channel?

Erratic readings typically stem from moisture contamination inside unsealed junction boxes, loose terminal connections, or mechanical degradation of the armored shield due to excessive vibration rubbing.

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