Emerson EPRO CON021+PR6423/010-020 Eddy Current System

Product Overview

The EPRO CON021 + PR6423/010-020 eddy current measurement system is an integrated solution for continuous shaft displacement and vibration monitoring in critical rotating machinery. It combines a CON021 signal conditioning module with a matched PR6423 proximity probe to deliver stable, high-resolution non-contact measurements under demanding industrial conditions.

This system is engineered for use in turbine supervisory and protection systems where accurate shaft position, relative vibration, and eccentricity data are essential for machine safety and reliability.

CON021 Eddy Current Signal Converter

The CON021 module is designed to interface directly with Emerson EPRO eddy current probes, converting raw sensor signals into standardized analog outputs suitable for machinery monitoring racks and DCS or PLC systems.

Key Technical Characteristics

• Measurement functions: Shaft displacement, relative vibration, axial position, eccentricity, and speed/key (configuration-dependent)

• Frequency response: DC to 20 kHz (-3 dB)

• Typical rise time: < 15 μs

• Input compatibility: PR6422, PR6423, PR6424, PR6425, PR6426, PR6453

• Output formats: Scaled voltage or current signals depending on module version

• Supply voltage range:

• -23 V to -32 V for -4 V to -20 V outputs

• -21 V to -32 V for -2 V to -18 V outputs

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

• Mechanical resistance: 5 g vibration at 60 Hz

• Protection rating: IP20

• Installation: Plug-in module for MMS 6000 and IMR 6000 racks

• Maintenance: Hot-swappable during system operation

PR6423/010-020 Eddy Current Probe

The PR6423/010-020 proximity probe is a 25 mm eddy current sensor optimized for high-accuracy shaft vibration and displacement measurement in turbomachinery applications.

Probe Specifications

• Sensor principle: Eddy current, non-contact

• Probe tip diameter: 25 mm

• Sensitivity: 2 V/mm (approximately 50.8 mV/mil)

• Linear measurement range: ±2.0 mm

• Recommended nominal gap: Approx. 2.5 mm

• Long-term stability: Drift ≤ ±1.5 %

• Probe operating temperature: -35 °C to +180 °C

• Short-term temperature tolerance: Up to +200 °C

• Cable temperature rating: Up to +200 °C

• Extension cable length: 2.0 m (variant-specific)

• Connector type: LEMO

Technical Advantages

• Factory-matched probe and converter ensure consistent calibration

• Fast dynamic response suitable for high-speed rotating shafts

• Non-contact measurement eliminates mechanical wear

• Stable operation in high temperature and high vibration environments

• Seamless integration with Emerson MMS 6000 and IMR 6000 platforms

Typical Applications

• Steam, gas, and hydro turbines

• Centrifugal and axial compressors

• Large pumps and industrial fans

• Turbine supervisory and machinery protection systems

• Continuous condition monitoring in power generation and process industries

Frequently Asked Questions

Q: Can the PR6423/010-020 be used with other CON series converters?
A: It is electrically compatible with selected CON series modules, but optimal accuracy and calibration are achieved when used with the CON021.

Q: Is this system suitable for high-temperature turbine bearings?
A: Yes. The probe and cable are rated for continuous operation up to +180 °C, with short excursions to +200 °C.

Q: Does the CON021 support online replacement?
A: Yes. The module is hot-swappable when installed in MMS 6000 or IMR 6000 racks.