19056-36 Bently Nevada Radiation Resistant Proximity Probe In Stock

Product Overview

The 19056-36 is a specialized reverse-mount radiation-resistant proximity probe manufactured by Bently Nevada. Engineed specifically for high-radiation, high-temperature industrial environments such as nuclear power generation and radiation-exposed turbo-machinery, this non-contact eddy current sensor measures shaft displacement, axial position, and dynamic vibration under severe operational constraints.

Featuring an anhydride-cured fiberglass-reinforced epoxy probe tip and a 300-series stainless steel body (3/8-24 UNF threads), the 19056-36 delivers long-term insulation stability where standard PPS probe tips degrade. Coupled with Tefzel-insulated 85 Ω coaxial cabling, it provides reliable signal transmission across harsh environment envelopes.

Configuration Breakdown

Part number coding structure for the 19056-36 radiation-resistant probe assembly:

• 19056 — Radiation Resistant Reverse Mount Proximity Probe Assembly (0.420-inch tip diameter, 3/8-24 UNF casing thread)
  • -36 Total Electrical Length Option (A Dim): 36 inches (0.91 meter) integrated coaxial cable length

Technical Specifications

Installation & Mounting Guidelines

• Reverse Mounting Hole Preparation: Verify 3/8-24 UNF internal mounting threads are clean, dry, and burr-free prior to inserting the probe body from the internal wall side.
• Thread Engagement Depth: Do not exceed the maximum 0.563-inch thread engagement depth limit to avoid body strain or tip alignment distortion.
• Torque Limit Setting: Tighten the 300-series stainless steel probe casing to a maximum torque of 33.9 N·m (300 in·lb) using a calibrated torque wrench.
• Cable Bend Radius: Maintain a minimum coaxial cable bend radius of 25.4 mm (1.0 inch) during routing through conduit runs.
• Supply Voltage Threshold: Ensure driver/Proximitor input power remains below -23.5 Vdc (e.g., -24 Vdc nominal) to avoid dynamic range clamping.

Field Inspection & Maintenance Procedures

• DC Resistance Loop Check: Measure DC resistance across the coaxial pin and shield; verify reading conforms to the 2.5 Ω + 0.410 Ω/m formula based on total cable length.
• Radiation Degradation Visual Audit: Periodically inspect the anhydride-cured epoxy tip for surface discoloration, micro-cracking, or thermal blistering during scheduled outages.
• Connector Cleanliness: Clean coaxial connector interfaces with electronic contact cleaner to eliminate metallic dusting and cross-contamination.

System Compatibility & Signal Wiring

The 19056-36 interfaces with radiation-hardened Proximitor sensors and extension cables. Signal lines route through 3-conductor shielded cabling (16 to 24 AWG) to Bently Nevada 3500 monitoring racks or nuclear-certified field signal conditioners over distances up to 305 meters (1,000 feet).

Packaging & Commercial Terms

• Product Condition: 100% Factory New & Original in original manufacturer packaging.
• Factory Warranty: Includes 12-Month full manufacturer defect warranty.
• Logistics Partners: Priority express dispatch via FedEx, UPS, or DHL.
• Handling Lead Time: Standard processing and dispatch within 24 to 48 hours following confirmation.

Industrial Applications & Application Scenarios

Plant automation engineers deploy the 19056-36 across critical nuclear and extreme-environment rotating machinery assets:

• Nuclear Reactor Coolant Pumps (RCP): Continuous non-contact radial shaft vibration tracking inside containment buildings subjected to ionizing gamma radiation.
• Nuclear Feedwater Turbines: Real-time thrust axial position monitoring in high-dose primary loop areas.
• Radiation Shielded Compressors: Shaft orbit and speed pulse detection where standard polymer components embrittle and fail under exposure.
• Specialized Industrial Accelerators: Precision distance measurement near high-energy radiation sources and high-temperature vacuum chambers.

Global PLC Spare HUB's Insight

Standard proximity probes using polyphenylene sulfide (PPS) tips rapidly embrittle and develop micro-fractures when exposed to continuous gamma radiation or neutron flux, causing oil ingress and coil shorting. The 19056-36 addresses this specific failure mode by using an anhydride-cured fiberglass-reinforced epoxy tip and Tefzel coaxial jacketing capable of absorbing significant cumulative radiation doses without structural breakdown.

During a containment overhaul project at a power generation facility, maintenance engineers replaced failing standard probes that suffered from insulation resistance drift. Installing 19056-36 units restored stable baseline DC gap voltages (-9 Vdc) and eliminated zero-point drift. Always confirm that mounting torque stays within the 33.9 N·m limit to avoid crushing internal body threads.

Frequently Asked Questions (FAQ)

Q: What mechanical feature differentiates a reverse-mount probe from a standard front-mount proximity probe?

A: Reverse-mount probes insert through the internal wall of a machine casing boss rather than from the outside, allowing the probe cable to exit backwards through narrow internal access channels.

Q: Why is anhydride-cured epoxy used for the tip instead of standard PPS thermoplastic?

A: Anhydride-cured epoxy maintains structural polymer stability and electrical insulation properties under intense ionizing radiation, whereas standard PPS plastic suffers molecular degradation and cracking.

Q: What occurs if the supply voltage operates at -20 VDC instead of -24 VDC?

A: Operating more positive than -23.5 Vdc restricts the transducer linear range, causing premature signal saturation at higher dynamic vibration amplitudes.

Q: How do I calculate expected nominal DC resistance for a 36-inch (0.91m) cable on this model?

A: Use the 0.420 probe formula: 2.5 Ω + (0.410 Ω/m × 0.91m) = approximately 2.87 Ω nominal loop resistance at ambient room temperature.

Q: How do I select between different electrical length options when replacing radiation-resistant probes in tight enclosures?

A: Measure the distance from the internal mounting boss to the containment junction box; choose an electrical length option (such as 36 inches) that allows direct connection to the extension cable without coiling excess Tefzel wire inside radiation-exposed areas.

Tags