Emerson PR6424/010-110 16mm Eddy-Current Contactless Sensor

Emerson PR6424/010-110 is a robust eddy current sensor designed for non-contact displacement and vibration measurement on shafts with a minimum diameter of 80mm (3.15 inches). Its larger 16mm probe tip provides superior electromagnetic field penetration, making it the preferred choice for large steam turbines, gas turbines, centrifugal compressors, and hydro generators .

The model designation "PR6424/010-110" specifies a unique configuration tailored for specific installation requirements. It indicates a sensor with 3/4"-16 UNF (Unified National Fine) imperial threading (the "010" designation) and a total case length optimized for deeper mounting applications, ensuring a precise fit in diverse machinery housings .

Key Technical Specifications (Specs)

The PR6424/010-110 is built to the exacting standards required for API 670-compliant machinery protection systems. Verified specifications from Emerson and global distributors include :

Manufacturer: Emerson (EPRO)

Product Type: 16mm Eddy Current Displacement Sensor

Model Number: PR6424/010-110

Threading: 3/4"-16 UNF (Imperial) 

Measurement Principle: Non-contact eddy current

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

Static Measurement Range: ±2.0 mm (±0.079") from nominal air gap 

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

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

Minimum Target Shaft Diameter: ≥80 mm 

Long-Term Drift: <0.3% ensures calibration stability over multi-year service intervals 

Target Material: Calibrated for ferromagnetic steel (42CrMo4 / AISI 4140 standard) 

Frequency Response and Dynamic Performance

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

Rise Time: <15 μs (when paired with CON021 converter) 

Environmental and Physical Specifications

The sensor is engineered for extreme industrial environments :

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

Temperature Error: <4% per 100K (meets API 670 requirements) 

Pressure Rating: 10,000 hPa (145 psi) at sensor head 

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

Sensor Tip Material: PEEK (Polyether Ether Ketone) 

Housing Material: Stainless steel sleeve 

Cable Insulation: PTFE (Teflon), oil- and water-resistant 

Weight (Sensor with 1m cable): Approx. 200 grams (7.05 oz) 

Protection Rating: IP65 / IP67 / IP66 (configuration dependent)