EPRO PR6423/008-110

Description

EPRO PR6423/008-110 — High-Temperature Eddy Current Proximity Probe for PLC Condition Monitoring Systems

EPRO PR6423/008-110 is a precision-engineered eddy current proximity probe developed by EPRO (a Siemens company), a global leader in industrial condition monitoring and automation solutions. Specifically designed for high-temperature rotating machinery in PLC-integrated systems, the 

 delivers accurate measurements of shaft displacement, vibration, and position in extreme thermal environments, enabling predictive maintenance and fault detection for critical equipment. With its robust high-temperature design, ultra-precise sensing capabilities, and seamless PLC/DCS compatibility, the 

 is a trusted component in power generation, oil and gas, chemical processing, and aerospace industries, ensuring reliable performance in PLC automation systems operating under harsh thermal conditions.

Product Description

 is a non-contact eddy current proximity probe optimized for high-temperature rotating machinery (e.g., gas turbines, steam turbines, industrial furnaces) where standard probes may fail. The product 

EPRO PR6423/008-110 operates on the eddy current principle: when paired with a compatible signal conditioner (e.g., PR9268, PR9376), it generates a high-frequency electromagnetic field that induces eddy currents in the conductive shaft, producing an analog voltage signal (-2 VDC to +2 VDC) proportional to the gap distance. This signal is transmitted to PLC/DCS systems for real-time processing, enabling monitoring of key parameters such as shaft runout, axial displacement, and radial vibration—critical for early detection of faults like misalignment, bearing wear, or thermal expansion issues. The 

 features a extended operating temperature range of -25 °C to +200 °C, making it ideal for installation in high-heat environments such as turbine enclosures or furnace blowers. It offers a measuring range of 0-8 mm (0-315 mils) and a resolution of <0.1 μm, ensuring ultra-precise detection of even minor shaft deviations. The probe’s rugged stainless-steel (316L) housing and high-temperature-resistant cable protect against thermal stress, chemical corrosion, and mechanical damage, while its non-contact design eliminates wear and tear. Seamlessly integrating with EPRO signal conditioners and major PLC brands (Siemens, Allen-Bradley, ABB), the 

 enables direct integration into PLC automation systems for condition-based maintenance, safety interlocking, and performance optimization. Whether used in power plant gas turbines or chemical plant compressors, the 

 provides actionable data to prevent unplanned downtime and extend machinery lifespan.

Technical Specifications

• Brand: (Siemens)
• Model: EPRO PR6423/008-110
• Device Type: High-Temperature Eddy Current Proximity Probe (PLC-compatible)
• Measuring Principle: Eddy current (non-contact)
• Measuring Range: 0-8 mm (0-315 mils)
• Output Signal: Analog voltage (-2 to +2 VDC, proportional to gap distance)
• Resolution: <0.1 μm
• Linearity Error: ±1% of full scale
• Frequency Response: 0-10 kHz (supports vibration measurement up to 10 kHz)
• Probe Tip Material: Tungsten carbide (wear-resistant, high conductivity)
• Housing Material: Stainless steel (316L) with high-temperature coating
• Operating Temperature Range: -25 °C to +200 °C (probe body); up to +250 °C (with extreme-temperature option)
• Pressure Rating: Up to 100 bar (1450 psi)
• Cable Length: 5 m (standard); customizable up to 15 m (with signal conditioner compensation)
• Cable Type: High-temperature silicone-insulated, shielded (PTFE jacket option for extreme heat)
• Compatibility: Requires EPRO signal conditioner (e.g., PR9268, PR9376) for PLC integration
• PLC Interface: Analog input (via signal conditioner output) or digital (PROFIBUS/PROFINET with compatible conditioner)
• Protection Rating: IP67 (probe body); IP65 (cable connector)
• Dimensions (Probe Body): Diameter 22 mm, Length 95 mm (standard)
• Certifications: CE, UL, CSA, ATEX, IECEx (for hazardous areas)

Advantages and Features

• Extreme Temperature Tolerance: The  operates reliably in -25 °C to +200 °C environments, outperforming standard probes and making it suitable for high-heat applications (e.g., gas turbines, furnace motors) in PLC-monitored systems.
• Ultra-Precision Measurement: <0.1 μm resolution and ±1% linearity error enable detection of micro-scale shaft deviations, supporting early fault diagnosis and predictive maintenance in critical machinery.
• Non-Contact Durability: Eddy current technology eliminates mechanical contact with the rotating shaft, ensuring long service life and consistent performance even at high speeds (up to 15,000 RPM+).
• Seamless PLC Integration: Works with EPRO signal conditioners to convert raw data into PLC-compatible analog/digital signals, integrating smoothly with Siemens S7, Allen-Bradley ControlLogix, and other major PLC systems for real-time monitoring.
• Harsh Environment Resistance: Stainless-steel housing, high-temperature cable, and IP67 protection rating withstand thermal stress, chemical corrosion, and moisture, ensuring reliability in extreme industrial conditions.
• Hazardous Area Compliance: ATEX and IECEx certifications support installation in Zone 1/2 (gas) and Zone 21/22 (dust) hazardous areas, meeting safety regulations in oil and gas, chemical, and power industries.

Application Fields and Use Cases

• Power Generation: In a combined-cycle gas turbine plant, the  monitors shaft displacement and vibration in the high-temperature turbine section (+180 °C), integrating with Siemens S7-400 PLCs via EPRO PR9376 signal conditioners to detect thermal expansion issues and trigger maintenance alerts.
• Oil and Gas Refining: In a catalytic cracking unit, the probe monitors the shaft runout of high-temperature process pumps (+150 °C) in Zone 1 hazardous areas, transmitting data to Allen-Bradley ControlLogix PLCs for real-time condition monitoring and safety interlocking.
• Aerospace Testing: In a jet engine test facility, the EPRO PR6423/008-110 measures axial displacement of engine shafts during high-temperature testing (+200 °C), integrating with ABB AC500 PLCs to ensure compliance with performance standards and detect manufacturing defects.
• Chemical Processing: In a petrochemical plant, the probe monitors centrifugal compressors in high-temperature reactor systems (+160 °C), enabling PLC-based predictive maintenance to avoid unplanned shutdowns of critical process equipment.
• Steel Manufacturing: In a blast furnace facility, the  monitors the condition of blower motors operating in +170 °C environments, providing data to Mitsubishi PLCs to optimize maintenance schedules and prevent production downtime.

Comparison with Competitors

Selection Recommendations and Precautions

• Selection Recommendations: Choose the  if your PLC automation system requires high-temperature rotating machinery monitoring (0-8 mm range, up to +200 °C). Verify compatibility with signal conditioners and ensure the probe’s temperature/pressure rating matches your application environment.
• Installation Precautions: Install the  with a consistent gap (2-6 mm) between the probe tip and shaft, ensuring alignment perpendicular to the shaft surface. Use high-temperature shielded cables to minimize EMI from PLC systems and industrial equipment.
• Configuration Tips: Calibrate the probe with a compatible EPRO signal conditioner, matching the output signal range to your PLC’s analog input module (-2 VDC to +2 VDC). Configure PLC logic to set alarm thresholds for vibration/displacement to trigger maintenance alerts.
• Maintenance: Periodically inspect the probe tip for contamination (e.g., carbon deposits, oil) and clean with a non-abrasive cloth. Check cable integrity (especially insulation) for signs of thermal degradation, and replace if damaged.
• Environmental Considerations: Avoid exceeding the probe’s temperature (+200 °C) and pressure (100 bar) limits. For extreme heat (>200 °C), select the optional +250 °C variant and PTFE cable to ensure long-term performance.

EPRO PR6423/008-110 is a high-performance, high-temperature proximity probe that delivers precise condition monitoring data for rotating machinery in PLC automation systems. Its extreme thermal tolerance, ultra-precision measurement, and seamless PLC integration make it an essential component for predictive maintenance in harsh industrial environments, helping industries optimize machinery performance and minimize unplanned downtime.

PR6423/008-110