Epro CON041+PR6423/002-031-CN Eddy Current Sensor System

Product Description

The PR6423/002-031-CN + CON041 system is a precision eddy-current sensing solution from Emerson EPRO, developed for continuous monitoring of shaft movement in rotating equipment. It enables accurate detection of radial vibration, axial displacement, and shaft position without physical contact, ensuring long-term operational reliability.

The PR6423/002-031-CN probe operates as an 8 mm eddy-current sensor designed for industrial environments, while the CON041 signal converter conditions the probe signal into a stable and linear output. This pairing delivers consistent measurement performance in high-speed and high-load machinery.

This configuration is widely deployed in machinery protection architectures aligned with API 670 practices, supporting critical assets where measurement accuracy and dynamic response are essential.

Technical Specifications

PR6423/002-031-CN Proximity Probe

• Measurement principle: Eddy-current, non-contact displacement sensing

• Probe diameter: 8 mm

• Measurement range: Up to 5 mm (application and calibration dependent; typical linear range smaller)

• Sensitivity: System-dependent, typically around 8 mV/µm with matching converter

• Frequency capability: Suitable for dynamic measurements up to ~10 kHz at probe level

• Operating temperature: –40°C to +120°C

• Construction: Stainless steel housing with corrosion-resistant design

• Cable type: Shielded integral cable with factory-matched characteristics

• Environmental protection: Designed for harsh industrial conditions (typically IP67 class)

CON041 Signal Converter

• Core function: Supplies probe excitation, processes RF signal, performs demodulation and linearization

• Bandwidth: 0 to 20 kHz (–3 dB), supporting high-speed machinery monitoring

• Response time: <15 µs for transient signal tracking

• Output: Linear analog voltage proportional to displacement (range configurable by system design)

• Power supply: Nominal –24 V DC (operating range –23 V to –32 V)

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

• Mechanical installation: DIN rail mounting with terminal connections

• Enclosure rating: IP20

• Compliance: CE, ATEX, IECEx, CSA certified variants available for hazardous areas

Performance Characteristics

• Non-contact measurement eliminates mechanical wear and drift

• Wide usable measurement span for different shaft geometries

• High bandwidth enables detection of rapid vibration changes

• Reliable operation in oil-contaminated and high-temperature environments

• Stable, linear output simplifies integration into protection systems

Application Areas

The PR6423/002-031-CN + CON041 system is commonly applied in:

• Steam and gas turbines

• Process compressors and expanders

• Pumps and gear-driven systems

• Generators and large electric motors

• Condition monitoring and machinery protection systems compliant with API 670

Comparison Within PR6423 Series

• Standard versions typically offer shorter measurement ranges (e.g., 2 mm), while the PR6423/002-031-CN supports extended displacement measurement up to 5 mm depending on calibration

• CN variants are adapted for specific regional installation or compliance requirements

• Converter selection (CON021 vs CON041) impacts bandwidth and dynamic response, with CON041 suited for higher-frequency applications

FAQ

Q: Is the full 0–5 mm range linear?
A: No. The linear measurement zone is smaller and depends on calibration and target material. The full range indicates the maximum detectable displacement.

Q: Can this probe be used with other signal converters?
A: It is recommended to use the matched CON041 to ensure proper calibration and performance. Using alternative drivers requires validation.

Q: What factors influence measurement stability?
A: Probe mounting rigidity, target material properties, environmental temperature, and proper gap setting are key factors affecting accuracy.