EPRO PR6423/010-000-CN Eddy Current Probe

The EPRO PR6423/010-000-CN is a precision eddy current displacement sensor, part of the CONTREC series, widely recognized as an industry standard for non-contact measurement in rotating machinery. This specific model features an 8mm probe diameter, designed for high-resolution measurement of both static (e.g., axial position, gap) and dynamic (e.g., shaft vibration, eccentricity) displacements. It operates on the proven eddy current principle, generating a low-power radio frequency field that interacts with a conductive target, producing an output signal directly proportional to the gap distance. This sensor is a fundamental component in EPRO's MMS 3000 and MMS 6000 machinery protection systems and is typically used in conjunction with a signal converter like the CON021.

Key Features

• Precision 8mm Probe: The 8mm diameter offers an excellent balance of measurement range and linearity for a wide variety of turbomachinery applications.

• Non-Contact Measurement: Eliminates mechanical wear and provides a high-frequency response suitable for monitoring fast-changing phenomena like shaft vibration.

• High Linearity: When used with the appropriate CON0x1 series converter, it achieves a linearity error of ≤1.0%, ensuring accurate representation of physical movement.

• Rugged Construction: Features a stainless steel, hermetically sealed tip for durability in harsh environments, including resistance to oil, water, and dust.

• Interchangeable Design: Designed to be fully interchangeable with standard calibration, simplifying maintenance and replacement.

• API 670 Compliance: Manufactured to meet the stringent requirements of API 670 for machinery protection systems.

Technical Specifications

• Probe Diameter: 8 mm

• Linear Measurement Range: Typically 2 mm (depending on converter and target material)

• Nominal Sensitivity: 8 V/mm (with standard target material and CON0x1 converter)

• Frequency Response: 0 to 10 kHz (limited by signal conditioner)

• Target Material: Ferromagnetic or non-ferromagnetic conductive materials (e.g., 4140 steel)

• Cable: Integral cable with length and connector type specified by suffix (e.g., /010-000).

• Operating Temperature (Tip): -30°C to +120°C 

• Protection Class: IP68 (probe body) 

Applications

The PR6423/010-000-CN is used extensively for critical machinery monitoring in power generation, oil & gas, and industrial processing. Typical applications include radial vibration measurement on turbine and compressor shafts, axial thrust position monitoring, shaft eccentricity measurement, and keyphasor detection for phase analysis. It is a key sensor for predictive maintenance and protection against catastrophic machine failures.

Integration and Calibration

The probe is designed to work with EPRO signal converters such as the CON011 and CON021. These converters provide the necessary oscillator, demodulator, and power to the probe, and condition the raw signal for use in monitoring systems. The system is typically calibrated with the specific target material of the machine (often 4140 steel). The suffix in the model number, such as /010-000, specifies details like the type of connector, cable length, and hazardous area approval.

Reliability and Environmental Compliance

Built for the rigors of continuous industrial service, the PR6423 probe is tested for resistance to vibration, shock, and extreme temperatures. Its hermetically sealed tip and robust construction ensure long-term stability in environments with oil mist, moisture, and other contaminants. Hazardous area versions are available for use in explosive environments, complying with ATEX and IECEx standards.

With its proven accuracy and robust design, the EPRO PR6423/010-000-CN eddy current probe is a trusted tool for safeguarding and optimizing the performance of high-value rotating assets.