Epro CON011/91+PR6426/010-140 Eddy Current Sensor System

Product Description

The PR6426/010-140 + CON011/91 measurement assembly from Emerson Electric is a large-diameter eddy-current based monitoring solution developed for precision tracking of shaft dynamics in heavy rotating machinery. It is engineered for continuous measurement of displacement and vibration in applications where large rotor sizes and harsh operating conditions are present.

This system integrates a 32 mm eddy-current probe with a dedicated signal conditioning module. The probe captures micro-scale changes in distance between shaft and sensor, while the CON011/91 converter processes and linearizes the signal into a standardized output suitable for protection systems, control platforms, and predictive maintenance systems.

System Function Overview

• Non-contact eddy-current measurement for large shaft applications

• Continuous monitoring of vibration, position, and eccentricity

• Signal conditioning for integration into industrial control systems

• Designed for high thermal and mechanical stress environments

• Suitable for API 670-aligned machinery protection architectures

Technical Specifications

Probe Unit (PR6426/010-140)

• Model: PR6426/010-140

• Sensor Type: Eddy-current displacement probe

• Probe Diameter: 32 mm

• Measurement Capability: up to 14 mm radial or axial displacement

• Sensitivity: 2 V/mm (50.8 mV/mil), linearity ≤ ±1.5%

• System Accuracy: ±0.1% full scale (application dependent)

• Frequency Response: up to 10 kHz

• Minimum Shaft Diameter: ≥ 200 mm

• Target Material: Ferromagnetic steel (e.g., 42CrMo4 / AISI 4140)

Environmental Performance (Probe)

• Operating Temperature: –35 °C to +160 °C

• Short-Term Exposure: up to 200 °C (< 4 hours)

• Shock Resistance: up to 40 g

• Pressure Capability: 6,500 hPa (approx. 94 psi)

• Protection Class: IP-rated (dust, oil, and moisture resistant design)

Mechanical Construction (Probe)

• Housing Material: Stainless steel

• Sensing Tip: PEEK high-performance polymer

• Cable Options: Armored or standard PTFE insulated

• Connector Types: LEMO or flying lead configuration

• Cable Length Options: 4 m / 5 m / 8 m / 10 m

• Weight: approx. 800 g (including short cable section)

Signal Converter (CON011/91)

• Function: Eddy-current signal conversion and linearization

• Output Signal: –4 V to –20 V DC with AC vibration component

• System Bandwidth: up to 10 kHz

• System Accuracy: ±0.1% full scale

• Recommended Installation Distance: ≤ 5 m between probe and converter

Environmental Conditions

• Operating Temperature: –35 °C to +160 °C (system level capability)

• Installation Type: Panel or cabinet mounting

• Connector Interface: Industrial LEMO sensor connection

System-Level Performance

• Measured Parameters:

• Radial shaft vibration

• Axial displacement

• Shaft eccentricity

• Keyphasor / rotational reference signals

• Dynamic Range: DC to 10 kHz

• Measurement Principle: Non-contact eddy-current transduction

• Application Accuracy: high-stability measurement for large rotor systems

Application Areas

The PR6426/010-140 + CON011/91 system is commonly applied in heavy-duty rotating equipment monitoring, including:

• Steam and gas turbines

• Hydro turbines

• Large centrifugal compressors

• Industrial pumps and ventilation systems

• High-inertia rotating machinery in energy production

FAQ

Q: Why is a 32 mm probe used in this system?
A: The larger probe diameter improves sensitivity and stability when monitoring large-diameter shafts above 200 mm.

Q: What role does the CON011/91 module perform?
A: It converts raw eddy-current signals into standardized voltage outputs for use in monitoring and control systems.

Q: Can the system measure both vibration and displacement?
A: Yes, it supports simultaneous monitoring of radial vibration, axial displacement, and eccentricity.

Q: Is this system suitable for harsh environments?
A: Yes, the probe is designed for high temperature, mechanical stress, and contaminated industrial environments.