Emerson PR6423/10R-030 Eddy Current Sensor Shaft Monitoring

Emerson PR6423/10R-030 (formerly EPRO) is a high-performance, non-contact eddy current sensor engineered for the rigorous demands of continuous vibration and displacement monitoring. As part of Emerson's legendary PR642x series, this 8mm sensor is the industry standard for protecting steam turbines, gas turbines, compressors, and pumps in power generation, oil and gas, and heavy industrial applications .

What is the Emerson PR6423/10R-030?

The PR6423/10R-030 is an eddy current displacement sensor designed to measure static and dynamic distances between the sensor tip and a conductive shaft surface . Utilizing the eddy current principle, a high-frequency alternating current passes through the sensor coil, generating a magnetic field. When a conductive target (like a rotating shaft) enters this field, eddy currents are induced, altering the impedance of the coil. This change is directly proportional to the gap distance, which is then converted into a usable voltage signal by a companion signal converter like the CON021 .

The "10R" in the part number designates a reverse mount configuration, allowing the sensor to be installed from behind the mounting surface. This is a critical feature for applications where space is constrained or where the sensor must be protected within the machine housing . The "-030" typically indicates a specific cable length and connector type, often referring to a 3.0-meter cable with a Lemo-style connector .

Key Technical Specifications (Specs)

The Emerson PR6423/10R-030 is built to the stringent requirements of the API 670 standard, offering laboratory-grade accuracy in an industrial package.

Manufacturer: Emerson (formerly EPRO)

Product Type: Eddy Current Displacement / Vibration Sensor

Sensing Tip Diameter: 8 mm 

Mounting Configuration: Reverse mount (10R) 

Linear Measurement Range: 2 mm (80 mils) 

Initial Air Gap: 0.5 mm (20 mils) 

Incremental Scale Factor (ISF): 8 V/mm (203.2 mV/mil) ±5% 

Deviation from Straight Line (DSL): ±0.025 mm (±1 mil) 

Minimum Shaft Diameter: 25 mm (0.79 in) 

Target Material (Standard): Ferromagnetic steel, 42CrMo4 (AISI/SAE 4140) 

Frequency Response: DC to 10 kHz 

Operating Temperature Range:

Sensor (with 1m cable): -35°C to +200°C (-31°F to +392°F) 

Cable & Connector: -35°C to +150°C (-31°F to +302°F) 

Alternate Specs: Up to -40°C to +125°C depending on cable variant 

Material Construction:

Sensor Tip: PEEK (Polyether Ether Ketone) 

Case: Stainless Steel 

Cable: PTFE (Polytetrafluoroethylene) 

Weight: Approx. 100 grams (3.53 oz) 

Protection Class: IP66 / IP67 

Compliance: CE, ATEX, CSA (for hazardous locations)