Emerson PR6423/009-010 Eddy Current Sensor

Emerson PR6423/009-010 is a high-performance eddy current displacement sensor designed to provide accurate, non-contact measurement of vibration and position in critical rotating machinery. As part of the renowned EPRO series of proximity probes, this sensor is engineered to meet the stringent requirements of API 670 standards, making it an essential component for monitoring steam turbines, gas turbines, compressors, gearboxes, pumps, and fans .

What is the Emerson PR6423/009-010?

The PR6423/009-010 is a non-contact eddy current sensor that measures the dynamic and static behavior of rotating shafts . It operates by generating a low-power radio frequency field at the tip of the probe. When a conductive target (such as a metal shaft) moves within this field, eddy currents are induced, and the sensor detects the resulting impedance change. This change is directly proportional to the distance between the probe tip and the shaft surface, providing a precise voltage output that corresponds to displacement, vibration, eccentricity, or speed .

Designed specifically for applications with smaller shaft diameters, the PR6423/009-010 features an 8mm target diameter, allowing it to fit into tight spaces where larger sensors cannot be installed . It is typically paired with a CON0xx series converter (such as CON021 or CON031) to condition the signal for integration with monitoring systems like the CSI 6500, MMS 6000, or AMS 6500 platforms .

Key Technical Specifications (Specs)

Parameter Specification

Model Number PR6423/009-010 

Sensor Type Eddy Current Proximity Probe

Target Diameter 8 mm

Linear Measurement Range 2 mm (80 mils) 

Initial Air Gap 0.5 mm (20 mils) 

Incremental Scale Factor (ISF) 8 V/mm ±5% (203.2 mV/mil) @ 0-45°C 

Frequency Response DC – 10 kHz 

Operating Temperature Sensor: -35°C to +180°C; CON021 Module: -20°C to +85°C 

Output Signal Voltage proportional to displacement (via CON module) 

Housing Material Stainless steel 

Mounting Thread Typically M10x1 or 3/8-24 UNF (variant dependent)

Protection Rating IP67 (probe tip and cable assembly)