EPRO CON021+PR6423/003-030 Eddy Current Proximity Probe System

Overview

The EPRO PR6423/003-030 + CON021 configuration is a complete eddy current proximity measurement solution engineered for continuous monitoring of rotating machinery. It combines a high-stability proximity probe with a precision signal converter, forming a calibrated signal chain from sensor tip to monitoring system input.

This system is designed for radial vibration, axial position, shaft displacement, and eccentricity measurement in critical turbomachinery such as turbines, compressors, pumps, and large fans. It is commonly deployed in protection and condition monitoring platforms including EPRO MMS 6000 and IMR 6000 systems.

System Architecture

The measurement chain consists of three matched elements:

• PR6423/003-030 Eddy Current Probe
• Extension cable (integrated with probe variant)
• CON021 Signal Converter

Factory matching ensures linear output, temperature stability, and long-term measurement accuracy.

Signal Converter – CON021

The CON021 is a rack-mounted eddy current signal conditioner designed to process raw probe signals and convert them into standardized analog outputs for control and protection systems.

Key Electrical Characteristics

• Input sensor compatibility: PR6422, PR6423, PR6424, PR6425, PR6426, PR6453
• Frequency response: DC to 20 kHz (–3 dB)
• Rise time: < 15 μs (typical)
• Output signal range: Configurable voltage outputs depending on supply variant
• Supply voltage range:
–23 V to –32 V (–4 V to –20 V output)
–21 V to –32 V (–2 V to –18 V output)

Mechanical & Environmental

• Operating temperature: –30 °C to +100 °C
• Protection class: IP20
• Shock resistance: 5 g at 60 Hz
• Installation: Hot-swappable rack module
• System compatibility: MMS 6000, IMR 6000

The converter is optimized for continuous operation in vibration protection systems where signal integrity and fast response are critical.

Eddy Current Probe – PR6423/003-030

The PR6423/003-030 is a 25 mm eddy current proximity probe designed for non-contact measurement of shaft motion relative to machine casing.

Sensor Performance

• Measurement principle: Eddy current displacement sensing
• Sensitivity: 2 V/mm (approx. 50.8 mV/mil)
• Linear measuring range: ±2.0 mm
• Recommended nominal gap: ~2.5 mm
• Long-term accuracy: ≤ ±1.5 %

Thermal & Mechanical Limits

• Probe operating temperature: –35 °C to +180 °C
• Short-term temperature exposure: up to +200 °C
• Cable temperature rating: up to +200 °C
• Cable length: 3.0 m (003-030 variant)
• Connector type: LEMO
• Construction: Industrial-grade stainless steel housing

This probe is suitable for harsh environments involving high temperature, oil mist, vibration, and continuous operation.

Typical Applications

• Steam, gas, and hydro turbines
• Centrifugal and axial compressors
• Large pumps and fans
• Shaft vibration and axial position monitoring
• Machinery protection and condition monitoring systems

System Advantages

• Non-contact measurement eliminates mechanical wear
• Wide frequency bandwidth supports both slow-roll and high-speed vibration analysis
• Factory-matched probe and converter ensure signal linearity
• Proven compatibility with EPRO rack-based monitoring platforms
• Stable performance under temperature and vibration stress

FAQ

Q: Is the PR6423/003-030 probe interchangeable with other CON021 variants?
A: Yes, as long as the CON021 is configured for PR6423 sensors and the total cable length matches calibration requirements.

Q: Can this system be used for axial position measurement?
A: Yes. With appropriate mechanical installation, the system supports axial position, thrust, and eccentricity measurements.

Q: Does the system require field calibration?
A: No. The probe and converter are factory matched and calibrated for immediate integration.