Emerson EPRO CON021+PR6423/00M-030 Eddy Current System

Overview

The EPRO CON021 + PR6423/00M-030 is an integrated eddy current measurement solution engineered for continuous condition monitoring of high-speed rotating machinery. The system combines a rack-mountable signal converter with a matched non-contact probe to provide stable, repeatable measurements of shaft displacement, relative vibration, axial position, and rotor eccentricity under demanding operating conditions.

This configuration is widely deployed in critical turbomachinery where long-term accuracy, fast dynamic response, and mechanical robustness are mandatory.

System Architecture

The measurement chain consists of three calibrated elements working as a matched set:

Eddy current probe → extension cable → signal converter → control or protection system

By pairing the PR6423/00M-030 probe with the CON021 converter, the system ensures optimal linearity, temperature stability, and signal integrity across the full operating range.

EPRO CON021 Signal Converter

The CON021 is a high-performance eddy current signal conditioner designed for rack-based machinery protection and monitoring systems. It converts raw probe signals into standardized analog outputs suitable for vibration monitoring modules, PLCs, and DCS platforms.

Key Technical Characteristics

• Measurement functions include radial shaft displacement, relative vibration, axial position, eccentricity, and speed/key signals (configuration dependent)

• Frequency response from DC up to 20 kHz (−3 dB), suitable for both slow-roll and high-speed dynamics

• Typical rise time below 15 μs, enabling accurate capture of transient events

• Compatible with Emerson EPRO probe families including PR6422, PR6423, PR6424, PR6425, PR6426, and PR6453

• Operating supply ranges:

• −23 V to −32 V with output scaling −4 V to −20 V

• −21 V to −32 V with output scaling −2 V to −18 V

• Designed for continuous operation in ambient temperatures from −30 °C to +100 °C

• Shock and vibration resistance rated at 5 g at 60 Hz

• IP20 protection for cabinet installation

• Fully compatible with MMS 6000 and IMR 6000 monitoring racks

• Supports hot-swap replacement without system shutdown

EPRO PR6423/00M-030 Eddy Current Probe

The PR6423/00M-030 is a precision eddy current displacement sensor optimized for radial vibration and position measurement on metallic shafts. Its mechanical design and electrical characteristics are matched to CON021 converters for maximum measurement stability.

Probe Specifications

• Sensor principle: Eddy current, non-contact

• Sensor head diameter: 25 mm

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

• Linear measurement range: ±2.0 mm

• Recommended nominal target gap: approximately 2.5 mm

• Long-term system accuracy: within ±1.5 % under stable conditions

• Probe operating temperature range: −35 °C to +180 °C, with short-term exposure up to +200 °C

• Cable temperature rating up to +200 °C

• Factory-defined cable length: 3.0 m

• Electrical connection via LEMO connector

• Typical sensor and cable mass between 0.6 and 0.8 kg (without armor)

Engineering Advantages

• Non-contact measurement eliminates mechanical wear and drift caused by friction

• High bandwidth allows detection of both low-frequency shaft movement and high-frequency vibration

• Stable output under wide temperature variations supports long-term trend analysis

• Modular rack integration simplifies maintenance and system expansion

• Matched probe-converter design minimizes calibration uncertainty

Typical Applications

• Steam, gas, and hydro turbines

• Centrifugal and axial compressors

• High-speed pumps and fans

• Critical rotating equipment in power generation, oil and gas, petrochemical, and heavy industrial plants

• Machinery protection and condition monitoring systems requiring API-compliant displacement measurement

FAQ

Is the PR6423/00M-030 interchangeable with other cable lengths?

No. Eddy current probes are calibrated as matched systems. Changing cable length requires a corresponding probe variant and recalibration with the signal converter.

Can the CON021 be used outside MMS 6000 or IMR 6000 racks?

The CON021 is optimized for these rack systems. Standalone use is not recommended without appropriate power supply and signal conditioning infrastructure.

What parameters can be measured with this system?

Depending on configuration, the system supports relative shaft vibration, static and dynamic displacement, axial position, eccentricity, and speed or phase reference signals.