Emerson PR6424/010-131 16mm Eddy-Current Contactless Sensor

Emerson PR6424/010-131 CON031 is a high-performance, non-contact eddy current measurement system engineered for critical turbomachinery protection and condition monitoring applications. As part of Emerson's distinguished EPRO product line, this comprehensive system combines a 16mm eddy current sensor with the advanced CON031 signal converter, delivering precise, reliable measurements for radial and axial shaft displacement, vibration, eccentricity, and rotational speed monitoring on large rotating equipment .

Designed specifically to meet the stringent requirements of API 670 machinery protection standards, the PR6424/010-131 CON031 excels in demanding environments including steam turbines, gas turbines, hydroelectric generators, centrifugal compressors, large pumps, and industrial fans .

System Components

PR6424/010-131 Eddy Current Sensor (16mm)

The PR6424/010-131 features a 16mm diameter sensor head optimized for large shaft applications. The "010-131" configuration code specifies an armored cable construction with extended length, making it ideal for installations requiring robust protection in harsh environments or deep mounting applications .

CON031 Eddy Current Signal Converter

The CON031 signal converter is factory-matched and calibrated to the PR6424/010-131 sensor, ensuring optimal linearity and sensitivity across the entire measurement range. This matched system approach eliminates field calibration uncertainty and provides true plug-and-play reliability .

Key Technical Specifications

PR6424/010-131 Sensor Specifications

Parameter Specification

Sensor Type Non-contact Eddy Current Sensor 

Sensor Head Diameter 16 mm 

Sensitivity / Linearity 4 V/mm (101.6 mV/mil), ≤ ±1.5% 

Static Measurement Range ±2.0 mm (0.079") 

Dynamic Measurement Range 0 to 1,000 μm (0 to 0.039") 

Center Air Gap Approx. 2.7 mm (0.11") nominal 

Minimum Shaft Diameter ≥80 mm 

Target Material Ferromagnetic steel (e.g., 42CrMo4 / SAE 4140) 

Maximum Surface Speed 2,500 m/s (98,425 ips) 

Long-Term Drift <0.3% 

Operating Temperature Range -35°C to +150°C (-31°F to +302°F) 

Temperature Error <4%/100 K (API 670 Compliant) 

Pressure Resistance Up to 10,000 hPa (145 psi) 

Shock and Vibration 5g @ 60 Hz @ 25°C (77°F) 

Material Sleeve: Stainless Steel; Cable: PTFE (armored construction) 

Weight Approx. 200 grams 

Certifications CE, ATEX, IECEx, CSA certified 

CON031 Signal Converter Specifications

Parameter Specification

Compatible Sensors PR6422, PR6423, PR6424, PR6425, PR6426 

Frequency Range (-3 dB) 0 to 20,000 Hz (DC to 20 kHz) 

Rise Time <15 µs 

Supply Voltage Range -23V to -32V (-4V to -20V output) 

Alternate Supply Range -21V to -32V (-2V to -18V output) 

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

Protection Class IP20 

Shock and Vibration 5g @ 60 Hz @ 25°C (77°F) 

Housing Material ALMgSi 0.5 F22 

Mounting 4 Screws M5x20 (included) 

Electrical Connection Screw terminals (max 1.5 mm²) 

Weight Approx. 120 grams 

Certifications CE, ATEX, IECEx, CSA certified