Emerson PR6423/10R-010 CON021 Eddy Current Sensor Shaft Monitoring

Emerson PR6423/10R-010 CON021 represents the gold standard in non-contact eddy current measurement technology. This complete, factory-matched system combines a rugged 8mm sensor with the high-performance CON021 signal converter, delivering precise, reliable data for radial vibration, axial position, shaft eccentricity, and speed monitoring on critical rotating equipment .

As part of Emerson's esteemed EPRO product line—formerly under the Philips brand—the PR6423/10R-010 CON021 is engineered specifically for API 670-compliant machinery protection systems, ensuring that steam turbines, gas turbines, compressors, pumps, and gearboxes operate safely and efficiently .

What is the Emerson PR6423/10R-010 CON021?

The Emerson PR6423/10R-010 CON021 is an integrated eddy current measurement system configured for North American industrial installations . It comprises two primary components:

PR6423/10R-010 Sensor: An 8mm eddy current probe featuring 3/8"-24 UNF (Unified National Fine) threading—the North American standard for mounting hardware . The 'R' designation indicates reverse mount capability, offering flexible installation options for various machinery geometries .

CON021 Signal Converter: A wide-bandwidth signal conditioner that translates the sensor's impedance changes into a high-level DC voltage output proportional to the gap between the probe tip and the target shaft .

This factory-calibrated, plug-and-play system eliminates the need for field matching, ensuring optimal linearity and sensitivity straight out of the box .

Key Technical Specifications (Specs)

The PR6423/10R-010 CON021 is built to the exacting standards required for critical turbomachinery protection. Verified specifications from multiple industrial distributors include :

Manufacturer: Emerson (EPRO)

Product Type: Eddy Current Displacement Measurement System (Sensor + Converter)

Sensor Model: PR6423/10R-010

Converter Model: CON021

Measurement Principle: Non-contact eddy current

Linear Measurement Range: 2.0 mm (80 mils) 

Initial Air Gap: 0.5 mm (20 mils) 

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

Linearity Deviation (DSL): ±0.025 mm (±1 mil) maximum 

Minimum Target Shaft Diameter: 25 mm (0.79") 

Standard Target Material: 42CrMo4 or AISI/SAE 4140 ferromagnetic steel 

Frequency Response and Dynamic Performance

Frequency Range (-3 dB): 0 to 20,000 Hz (DC to 20 kHz)—captures both static position and high-frequency vibration events 

Rise Time: <15 μs 

Optimized Dynamic Range: 50 to 500 μm (2 to 20 mils) 

Environmental and Physical Specifications

The sensor is engineered for extreme industrial environments :

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

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

Protection Rating: IP66 per IEC 60529—complete dust protection and resistance to high-pressure water jets 

Sensor Tip Material: PEEK (Polyether Ether Ketone) 

Housing Material: Stainless Steel 

Cable Insulation: PTFE (Polytetrafluoroethylene) 

Connector: Self-locking Lemo plug (brass, nickel-plated) 

Weight (Sensor with 1m cable): Approx. 100 grams (3.53 oz) 

CON021 Converter Specifications

Supply Voltage Range: -23V to -32V or -21V to -32V (depending on output range) 

Output Voltage: -4V to -20V or -2V to -18V (proportional to gap) 

Housing Material: ALMgSi 0.5 F22 (aluminum alloy) 

Operating Temperature: -30°C to 100°C (-22°F to 212°F) 

Mounting: Panel or DIN rail via 4x M5x20 screws (included) 

Weight (Converter): Approx. 120 grams (4.24 oz)