Epro PR6423/004-000 Eddy Current Displacement Probe

Product Summary

The PR6423/004-000 from EPRO (Emerson) is an 8 mm eddy current proximity probe used for continuous monitoring of shaft dynamics in rotating machinery. It is designed for precise non-contact measurement of vibration, axial/radial displacement, and rotor position in high-speed industrial equipment.

The probe is optimized for long-term stability in harsh mechanical and thermal environments, typically deployed in turbine trains, compressors, pumps, and gearbox systems where reliable shaft condition data is critical.

Technical Specifications

Model: PR6423/004-000
Manufacturer: EPRO (Emerson)
Sensor Type: Eddy Current Displacement / Proximity Probe
Country of Origin: Germany

Measurement Characteristics

• Nominal Measurement Range: 2 mm (80 mils) linear displacement window

• Initial Air Gap: ~0.5 mm (nominal installation gap)

• Sensitivity (Scale Factor): 8 V/mm ±5% (0–45 °C reference range)

• Linearity Deviation: ±0.025 mm within calibrated range

• Minimum Shaft Diameter: ≥25 mm recommended

• Target Material: Ferromagnetic steel (e.g., AISI 4140 or equivalent)

Physical Construction

• Probe Tip Diameter: 8 mm

• Probe Body Design: Compact cylindrical stainless steel housing

• Installation Thread: Standard industrial probe mounting format (compatible with EPRO extension systems)

Environmental Performance

• Operating Temperature: −35 °C to +180 °C

• Protection Rating: IP66 (dust-tight and high-pressure water jet resistant)

• Standard Compliance: IEC 60529 environmental sealing classification

• High thermal stability for turbine casing and bearing housing installations

System Integration Notes

• Designed for use with EPRO signal conditioners (e.g., CON011 / CON021 series)

• Requires matching extension cable and driver electronics for calibrated output

• Output characteristics depend on matched probe-converter system calibration

• Best performance achieved within defined linear operating gap range

Application Scenarios

• Steam and gas turbine shaft vibration monitoring

• Compressor rotor radial displacement measurement

• Hydro turbine axial position tracking

• Industrial gearbox bearing condition analysis

• Pump shaft eccentricity and alignment monitoring

Engineering Considerations

• Measurement accuracy depends on ferromagnetic target material properties

• Limited to short displacement range (2 mm), unsuitable for large stroke motion

• Calibration accuracy specified at 0–45 °C; drift may increase outside range

• Requires stable mechanical mounting to avoid signal distortion

FAQ

Q1: Can this probe measure non-metal surfaces?
No. It requires a conductive ferromagnetic target for eddy current induction.

Q2: Is it compatible with all signal converters?
It is optimized for EPRO CON-series drivers; compatibility with other systems requires verification.

Q3: Can it be used in high-temperature turbine zones?
Yes, up to 180 °C, provided extension cabling and converter are rated accordingly.