Emerson EPRO CON021+PR6423/007-140 Eddy Current System

Product Description

The EPRO CON021 + PR6423/007-140 is an integrated eddy current sensing solution engineered for continuous condition monitoring of critical rotating machinery. The system combines a CON021 signal converter with a matched PR6423 eddy current probe to deliver accurate, stable, non-contact measurements of shaft motion parameters.

This configuration is widely deployed in turbomachinery protection and diagnostic systems where high bandwidth, thermal stability, and long-term reliability are essential.

Measurement Capabilities

When installed as a calibrated pair, the system provides real-time monitoring of:

• Shaft radial displacement

• Relative vibration

• Shaft position and eccentricity

• Dynamic motion trends for machinery protection systems

The non-contact operating principle eliminates mechanical wear and ensures consistent performance under demanding industrial conditions.

CON021 Signal Converter – Technical Details

The CON021 is a rack-mounted eddy current signal conditioner designed for direct integration into Emerson MMS 6000 and IMR 6000 monitoring systems.

Key technical characteristics include:

• Signal processing optimized for eddy current displacement sensors

• Frequency response from DC to 20 kHz (–3 dB)

• Typical rise time below 15 μs for fast transient response

• Analog output ranges configurable within –2 to –20 V or –4 to –20 V

• Sensor excitation and linearization handled internally

• Operating temperature range from –30 °C to +100 °C

• Designed for hot-swap replacement in energized racks

• IP20 protection for cabinet-mounted environments

The converter supports multiple EPRO probe families, ensuring interchangeability across monitoring channels.

PR6423/007-140 Eddy Current Probe – Technical Details

The PR6423/007-140 is a 25 mm eddy current displacement probe optimized for high-resolution vibration and position measurements on metallic shafts.

Technical highlights:

• Sensor head diameter: 25 mm

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

• Linear measurement range: ±2.0 mm

• Recommended nominal air gap: approximately 2.5 mm

• Long-term stability with drift ≤ ±1.5%

• Continuous probe operating temperature up to +180 °C

• Short-duration temperature exposure up to +200 °C

• Integrated 14.0 m high-temperature cable

• LEMO connector for secure electrical connection

• Designed for use with CON021 signal converters without additional calibration components

The extended cable length allows flexible routing in large turbine or compressor installations.

System Integration

Together, the probe and converter operate as a matched measurement chain, ensuring:

• Correct sensitivity scaling

• Stable signal transmission over long cable runs

• High immunity to electromagnetic interference

• Reliable interface with machinery protection systems

The architecture follows the standard structure:
Eddy current probe → Signal converter → Monitoring rack or control system.

Typical Applications

This system is commonly used in:

• Steam, gas, and hydro turbines

• Centrifugal and axial compressors

• High-speed pumps

• Large industrial fans

• Condition monitoring and machinery protection systems

It is suitable for both new installations and retrofit projects in power generation, oil & gas, and heavy industrial plants.

FAQ

Is the PR6423/007-140 probe pre-matched to the CON021?

Yes. The probe is designed to operate within the calibrated input range of the CON021, ensuring correct sensitivity and linearity when installed according to Emerson guidelines.

Can the CON021 support other probe models?

The CON021 is compatible with several EPRO eddy current probe series, including PR6422, PR6423, PR6424, PR6425, PR6426, and PR6453, subject to configuration.

Is this system suitable for high-temperature environments?

Yes. The probe and cable are rated for elevated temperatures typical of turbine bearing housings, while the converter is designed for controlled cabinet environments.