EPRO CON021+PR6423/010-110 Eddy Current Shaft Monitoring System

Product Overview

The EPRO CON021 + PR6423/010-110 configuration is an integrated eddy current measurement solution engineered for continuous monitoring of rotating machinery. It combines a CON021 signal conditioning module with a PR6423 series proximity probe to deliver stable, high-resolution measurements of shaft vibration, radial displacement, axial position, and eccentricity.

Designed for long-term operation in demanding industrial environments, this system is commonly deployed in steam turbines, gas turbines, hydro units, compressors, pumps, and large fans where non-contact measurement and fast dynamic response are critical.

System Architecture

The measurement chain is composed of three functional stages: the PR6423/010-110 proximity probe detects shaft movement without physical contact, the CON021 signal converter linearizes and conditions the signal, and the output is transmitted to a rack-based monitoring or protection system such as MMS 6000 or IMR 6000.

This architecture ensures repeatable measurement accuracy and reliable integration into plant condition monitoring infrastructures.

EPRO CON021 Signal Converter

The CON021 is a rack-mountable eddy current signal conditioner designed to operate with multiple EPRO proximity probe families. It converts high-frequency sensor signals into standardized analog outputs suitable for protection, control, and diagnostic systems.

Key technical characteristics include a wide usable frequency band for dynamic vibration analysis, fast transient response for capturing rapid shaft movement, and electrical compatibility with Emerson MMS and IMR monitoring platforms. The module supports hot-swap replacement, reducing downtime during maintenance activities.

EPRO PR6423/010-110 Eddy Current Probe

The PR6423/010-110 is a 25 mm proximity probe optimized for radial vibration and displacement measurement on rotating shafts. The probe operates on the eddy current principle, enabling stable non-contact sensing even in high-temperature and high-vibration environments.

This specific variant is supplied with an 11.0 m integral cable and factory-matched characteristics to ensure linear response when paired with the CON021 converter. The probe assembly maintains measurement stability over long operating periods with minimal thermal drift.

Technical Specifications

CON021 Signal Converter

• Measurement Functions: Shaft vibration, radial displacement, axial position, eccentricity, speed/key (configuration-dependent)

• Frequency Response: DC to 20 kHz (–3 dB)

• Typical Rise Time: < 15 μs

• Compatible Probes: PR6422, PR6423, PR6424, PR6425, PR6426, PR6453

• Supply Voltage Range: –21 V to –32 V (model-dependent output scaling)

• Output Type: Analog voltage signal (rack system dependent)

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

• Mechanical Resistance: 5 g vibration at 60 Hz

• Protection Rating: IP20

• Installation: MMS 6000 / IMR 6000 rack, hot-swappable module

PR6423/010-110 Proximity Probe

• Sensor Principle: Eddy current displacement and vibration sensing

• Probe Tip Diameter: 25 mm

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

• Linear Measurement Range: ±2.0 mm

• Nominal Target Gap: Approximately 2.5 mm

• Long-Term Stability: Drift ≤ ±1.5%

• Probe Operating Temperature: –35 °C to +180 °C (short-term up to +200 °C)

• Cable Length: 11.0 m

• Cable Temperature Rating: Up to +200 °C

• Connector Type: LEMO

Key Technical Advantages

Non-contact sensing eliminates mechanical wear and ensures consistent long-term measurements.
Fast signal response allows accurate tracking of transient shaft behavior.
Wide probe compatibility simplifies spare parts management across EPRO systems.
Designed for continuous operation in high-temperature and high-vibration machinery environments.
Seamless integration with Emerson MMS 6000 and IMR 6000 monitoring racks.

Typical Applications

• Steam, gas, and hydro turbine shaft monitoring

• Large centrifugal and axial compressors

• Critical process pumps and fans

• Machinery protection and condition monitoring systems

Frequently Asked Questions

Q: Is the PR6423/010-110 probe interchangeable with other cable lengths?
A: The probe, cable, and converter are factory-matched. Using a different cable length requires recalibration or a different probe variant.

Q: Can this system be used for axial position measurement?
A: Yes. When correctly installed and configured, the CON021 + PR6423/010-110 can be used for axial position and thrust monitoring.

Q: Is the CON021 compatible with third-party monitoring racks?
A: The CON021 is primarily designed for Emerson MMS 6000 and IMR 6000 systems. Compatibility with other platforms depends on signal requirements and system architecture.