Emerson PR6423/10R-111 Eddy Current Sensor Precision Shaft Monitoring

Emerson PR6423/10R-111 (formerly EPRO) is a high-precision, 8mm eddy current displacement sensor engineered to provide non-contact measurement of shaft vibration, axial position, and eccentricity in critical rotating machinery . As an integral component of Emerson's machinery protection systems, this sensor delivers the reliability and accuracy required for API 670-compliant monitoring applications in power generation, oil and gas, and heavy industrial environments.

What is the Emerson PR6423/10R-111?

The PR6423/10R-111 is an 8mm eddy current probe designed for permanent installation on steam turbines, gas turbines, compressors, gearboxes, and pumps . Operating on the eddy current principle, the sensor generates a high-frequency electromagnetic field that interacts with the conductive rotor shaft. Changes in the gap distance alter the field characteristics, producing a proportional output voltage that accurately represents the shaft's static position and dynamic movement. This non-contact measurement method eliminates mechanical wear and provides maintenance-free operation over decades of continuous service .

Decoding the Model Number

Understanding the PR6423/10R-111 configuration is essential for proper specification:

PR6423: 8mm tip diameter sensor family

/10: Specific configuration variant with defined mechanical and electrical characteristics

R: Denotes specific cable and connector configuration

111: Complete assembly code indicating sensor with integrated cable and termination

Key Technical Specifications

Based on verified supplier data and comparison with documented PR6423 series specifications :

Parameter Specification

Sensor Type Eddy current (non-contact)

Tip Diameter 8 mm

Measurement Principle Inductive, variable reluctance

Housing Material Stainless steel

Cable Insulation PTFE (Polytetrafluoroethylene)

Channels Single-channel (dual-channel functionality requires CON021 converter)

Typical Measurement Range Radial displacement, shaft vibration, axial position

Operating Temperature -35°C to +100°C (integral cable) 

Standards Compliance DIN 45670, ISO 10817-1 

System Integration Compatible with CON021 signal converters, AMS 6500, CSI 6500