Emerson EPRO PR6423/003-031 Eddy Current Sensor

Emerson EPRO PR6423/003-031 is a high-precision eddy current displacement sensor engineered to provide non-contact, continuous measurement of shaft vibration, axial position, and eccentricity. As a fundamental component of API 670-compliant machinery protection systems, this sensor is the trusted choice for safeguarding steam turbines, gas turbines, compressors, and pumps in the most demanding industrial environments .

What is the Emerson EPRO PR6423/003-031?

The PR6423/003-031 is an 8 mm eddy current proximity probe manufactured by Emerson's EPRO brand (now part of Amphenol) . It operates on the principle of eddy currents to perform non-contact measurement of conductive target objects, typically rotating shafts. Because there is no physical contact, the sensor eliminates wear and ensures long-term measurement stability, making it ideal for continuous, around-the-clock monitoring in critical machinery protection applications .

This specific sensor is designed to integrate seamlessly with EPRO signal converters such as the CON021 and CON041, and monitoring systems like the MMS 6000 and AMS 6500, providing a complete, turnkey solution for machinery health monitoring .

Key Technical Specifications (Specs)

The Emerson PR6423/003-031 is built to exacting standards, delivering reliable data in the harshest conditions.

Manufacturer: Emerson EPRO (Amphenol) 

Part Number: PR6423/003-031

Sensor Type: Eddy Current Proximity Sensor 

Measurement Capabilities: Shaft vibration, axial displacement, radial position, eccentricity 

Measurement Range: Typically 0-20 mm or up to 30 mm, depending on system configuration 

Accuracy: ±0.25% of full scale 

Resolution: 0.01 mm 

Frequency Response: 50 Hz to 10 kHz, capable of capturing both static position and dynamic vibration events 

Operating Temperature: -40°C to +85°C (or +125°C with CON041 converter), ensuring performance in extreme environments 

Protection Rating: IP67 (dust-tight and waterproof) 

Output Signal: When paired with a signal converter, the system typically provides 4-20 mA analog output or voltage output (e.g., 8V/mm) for seamless integration with PLCs, DCS, and monitoring systems 

Mounting Thread: M8 x 1 

Housing Material: High-grade stainless steel, offering durability and corrosion resistance 

Country of Origin: Germany 

*Note: Some third-party vendor listings in the search results incorrectly describe the PR6423/003-031 as a "current sensor." This is a mischaracterization. The PR6423 series is definitively an eddy current proximity sensor for displacement and vibration measurement.

The PR6423/003-031 is designed as part of a comprehensive monitoring ecosystem. It integrates effortlessly with:

EPRO CON021 and CON041 Signal Converters for signal conditioning and linearization .

EPRO MMS 6000 and Emerson AMS 6500 machinery protection systems.

PLC, DCS, and SCADA systems via standard 4-20 mA or voltage outputs.

AMS Machinery Manager software for predictive maintenance and trend analysis.