Epro CON041+PR6423/004-030-CN Eddy Current Proximity Sensor System

Product Description

The PR6423/004-030-CN + CON041 assembly is a precision eddy-current sensing solution from Emerson EPRO, intended for continuous monitoring of shaft motion in rotating machinery. It enables accurate detection of radial vibration, shaft displacement, and eccentricity without mechanical contact, making it suitable for long-term operation in demanding industrial environments.

The PR6423/004-030-CN probe is an 8 mm proximity sensor designed for installation in turbine and compressor bearing housings. It works in conjunction with the CON041 signal converter, which excites the probe coil, processes the returned high-frequency signal, and generates a proportional analog output for control and protection systems.

The “004-030-CN” designation refers to a 4-meter integrated cable and a configuration adapted for specific regional compliance and installation practices.

Technical Specifications

PR6423/004-030-CN Eddy Current Probe

• Measurement principle: Non-contact eddy-current displacement sensing

• Probe tip diameter: 8 mm

• Cable length: 4 meters (factory attached)

• Linear measurement range: Typically 0 to 2 mm

• Extended range: Up to approximately 3 mm depending on calibration and target material

• Sensitivity: Approx. 7.87 mV/µm (with matched CON041 driver)

• Frequency capability: DC to 10 kHz

• Target material: Conductive ferromagnetic steel (e.g., 42CrMo4 / AISI 4140)

• Operating temperature: –35°C to +180°C

• Environmental protection: IP66 to IP67

• Mechanical construction:

• Stainless steel housing

• High-temperature PEEK probe tip

• PTFE-insulated cable

CON041 Signal Converter

• Function: Probe excitation, RF signal demodulation, linearization, and output conditioning

• Output signal: Linear analog voltage, typically 0–10 V proportional to displacement

• Frequency bandwidth: 0 to 20 kHz (–3 dB)

• Dynamic response: Rise time <15 µs

• Power supply: –23 V to –32 V DC (nominal –24 V)

• Operating temperature: –30°C to +100°C

• Installation: DIN rail mounting with screw terminals

• Enclosure protection: IP20

• Certifications: CE, ATEX, IECEx, CSA (variant dependent)

Performance Characteristics

• Contactless measurement eliminates wear and mechanical loading

• High bandwidth supports monitoring of fast shaft dynamics

• Stable and repeatable output across operating range

• Resistant to oil, steam, and industrial contamination

• Suitable for continuous duty in harsh process environments

Application Areas

The PR6423/004-030-CN + CON041 system is typically used in:

• Steam and gas turbines

• Centrifugal compressors

• Industrial pumps and gearboxes

• Power generation units

• API 670 compliant machinery protection systems

Comparison Within PR6423 Series

• 4 m cable version provides flexibility for medium-distance installations compared to shorter variants

• Measurement range aligns with standard 8 mm probe configurations, offering a balance between sensitivity and range

• When paired with CON041, the system provides higher dynamic performance than lower-bandwidth drivers

FAQ

Q: Can this probe measure axial position as well as radial vibration?
A: Yes, depending on mounting orientation, it can be used for both radial and axial displacement measurements.

Q: Is recalibration required if replacing only the probe?
A: Yes, probe and driver are calibrated as a system. Replacement should be matched and verified to maintain accuracy.

Q: What installation factors are critical for accuracy?
A: Proper gap setting, rigid mounting, correct target material, and shielding from electromagnetic interference are essential.