Emerson PR6424/011-140 16mm Eddy-Current Contactless Sensor

Emerson PR6424/011-140 is a high-performance, 16mm eddy current sensor designed for non-contact measurement of shaft vibration, displacement, eccentricity, and rotational speed on large rotating machinery. This model is typically factory-matched with the CON021 signal converter, forming a complete, calibrated measurement system that delivers exceptional accuracy and stability .

Operating on the principle of eddy current technology, the sensor generates a high-frequency magnetic field from its tip. When a conductive target (such as a rotating shaft) approaches this field, eddy currents are induced, altering the sensor's impedance. The CON021 converter detects these minute impedance changes and converts them into a proportional DC voltage signal, providing real-time data on the target's position and dynamic behavior.

Key Technical Specifications

The PR6424/011-140 CON021 is built to the exacting standards required for critical machinery protection. Below are the verified specifications from authoritative sources .

Sensor Specifications (PR6424/011-140)

Parameter Value

Sensor Type Eddy Current (Non-contact) 

Series EPRO Series 

Sensor Head Diameter 16 mm 

Measurement Principle Eddy Current Effect 

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

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

Static Measurement Range ±2.0 mm (0.079") 

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

Minimum Shaft Diameter ≥80 mm (3.15") 

Target Material Ferromagnetic Steel (42 Cr Mo4 standard) 

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

Frequency Response DC to 10 kHz (0.1 Hz - 10 kHz) 

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

Pressure Resistance 10,000 hPa (145 psi) 

Operating Temperature -35°C to +180°C (-31°F to +356°F) 

Shock and Vibration 5g @ 60 Hz @ 25°C 

Material Stainless Steel Sleeve, PTFE Cable 

Weight (Sensor & 1M Cable, Unarmored) Approx. 200 grams (7.05 oz) 

Protection Class IP65 to IP67 (depending on configuration) 

Certifications API 670, ISO 10817-1, CE, ATEX, IECEx, CSA 

CON021 Signal Converter Specifications

Parameter Value

Compatible Converter CON021 

Output Signal -4V to -20V DC (superimposed with AC vibration signal) 

Frequency Response 0 to 20,000 Hz (with sensor)

Response Time ≤15 ms 

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

Protection Class IP20 

Mounting 4x M5x20 screws (panel or DIN rail) 

Connection Self-locking Lemo plug to sensor 

Circuit Protection Open/short/reverse voltage protection