EPRO PR6423 Eddy Current Sensor Modules: PR6423/10R-141 CON031

Technical Dossier

Product Details And Specifications

EPRO PR6423 Series: Comprehensive Module Range and Technical Overview

The EPRO PR6423 series is a family of eddy current proximity sensors engineered for non-contact displacement, vibration, and position measurement in rotating machinery. Manufactured by EPRO GmbH (a Woodward company), these sensors are deployed across the most demanding segments of global heavy industry: petrochemical refineries, nuclear power stations, offshore platforms, gas turbine installations, and large-scale compressor trains. The PR6423 series operates on the eddy current principle, providing continuous analog output proportional to the gap between the sensor tip and a conductive target surface. Its immunity to oil, steam, and aggressive media makes it the preferred choice for API 670-compliant machinery protection systems worldwide. Installed base spans hundreds of thousands of measurement points across facilities operated by Shell, ExxonMobil, BASF, Sinopec, and comparable tier-1 operators.

The Evolution of PR6423 Architecture

The PR6423 series traces its lineage to EPRO's early eddy current product lines developed in the 1980s for turbomachinery OEM integration. The original architecture paired a passive sensor probe with a dedicated driver/oscillator unit (the CON0xx series), establishing a two-component topology that remains the standard today. Early variants used fixed cable lengths and non-interchangeable probe-driver pairs, requiring matched calibration. Subsequent generations introduced extended temperature ratings (up to 180°C at the probe tip), improved EMI shielding on the integral cable, and standardized 5 m / 9 m / 11 m cable configurations to align with API 670 installation geometry requirements. The CON031 driver introduced a wider supply voltage tolerance and enhanced output linearity across the full measurement range. Modern variants are backward-compatible at the signal level with legacy EPRO monitors (MMS 3000, MMS 6000) and third-party systems accepting ±24 V or 4–20 mA analog inputs. As the broader EPRO product line has matured, the PR6423 family has entered a stable/late-lifecycle phase: new installations increasingly specify the PR6424 or PR9268 series for digital output compatibility, but the PR6423 remains the dominant replacement and spare part specification for existing machinery protection infrastructure.

PR6423 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked configurations within the PR6423 eddy current sensor family. Each probe is paired with a compatible CON0xx driver/oscillator. Functional categories are indicated.

Eddy Current Probes — Standard Range

• PR6423/00R-010: 5 mm tip diameter probe, 5 m integral cable, standard temperature, M10 thread mount
• PR6423/00R-030: 5 mm tip diameter probe, 9 m integral cable, standard temperature, M10 thread mount
• PR6423/002-030: 5 mm probe, 9 m cable, extended EMI shielding, M10 thread, API 670 compliant
• PR6423/003-030: 5 mm probe, 9 m cable, high-temperature variant (up to 150°C), M10 thread
• PR6423/005-030: 5 mm probe, 9 m cable, ATEX/IECEx certified for Zone 1 hazardous areas
• PR6423/010-030: 8 mm tip diameter probe, 9 m cable, increased measurement range, M14 thread
• PR6423/10R-030: 8 mm probe, 9 m cable, reverse-polarity output configuration, M14 thread
• PR6423/10R-141: 8 mm probe, 11 m integral cable, reverse-polarity output, M14 thread — the probe component of the PR6423/10R-141 CON031 assembly
• PR6423/012-030: 8 mm probe, 9 m cable, high-temperature rating (up to 180°C), M14 thread
• PR6423/015-030: 8 mm probe, 9 m cable, ATEX Zone 0 certified, stainless steel body

Driver / Oscillator Units (CON Series) — Signal Conditioning

• CON011: Standard driver for 5 mm PR6423 probes, ±24 VDC supply, analog voltage output
• CON021: Driver for 5 mm probes, 4–20 mA current loop output, DIN rail mount
• CON031: Driver for 8 mm PR6423 probes (including PR6423/10R-141), ±24 VDC supply, voltage output, panel or DIN rail mount — the driver component of the PR6423/10R-141 CON031 assembly
• CON041: High-temperature driver variant, extended input voltage range, compatible with PR6423/012 and PR6423/015 probes
• CON051: Intrinsically safe driver, ATEX/IECEx certified, for use with Zone 0/1 probe variants

Complete Matched Assemblies

• PR6423/10R-141 CON031: 8 mm eddy current sensor assembly, 11 m cable, reverse-polarity output, CON031 driver — primary SKU for this listing
• PR6423/00R-010 CON011: 5 mm standard assembly, 5 m cable, CON011 driver, entry-level machinery monitoring
• PR6423/005-030 CON051: ATEX-certified assembly for hazardous area radial vibration measurement

Sourcing Hard-to-Find & Obsolete PR6423 Parts

Quality Control for the PR6423 Range

The PR6423 probe-driver assembly is a precision analog measurement system. Quality verification at DriveKNMS follows a structured protocol specific to eddy current sensor pairs. Each probe is inspected for tip surface condition, thread integrity, and cable jacket continuity. The integral cable is tested for insulation resistance and shield continuity across its full length. Driver units (CON0xx) are bench-tested under controlled supply voltage conditions: output voltage linearity is verified across the full gap range (typically 0–2 mm for 5 mm probes, 0–4 mm for 8 mm probes) using a calibrated aluminum target disc. Sensitivity (mV/µm) is measured and compared against the original EPRO factory specification for the specific probe-driver combination. For matched assemblies such as the PR6423/10R-141 CON031, the probe and driver are tested as a pair to confirm system-level calibration. Units that fall outside the ±2% linearity tolerance are rejected. All tested units are issued a DriveKNMS inspection certificate with recorded test data, suitable for inclusion in plant maintenance records.