EPRO PR6423 Eddy Current Sensors: PR6423/10R-030-CN CON021

Technical Dossier

Product Details And Specifications

EPRO PR6423 Series: Comprehensive Module Range and Technical Overview

The EPRO PR6423 series represents one of the most widely deployed eddy current proximity sensor families in global heavy industry. Installed across petrochemical refineries, nuclear power stations, offshore platforms, and large-scale rotating machinery facilities, the PR6423 series functions as the primary non-contact displacement and vibration measurement solution in conjunction with EPRO CON0xx signal conditioning modules. Its design conforms to API 670 machinery protection standards, making it the default sensor choice for turbine shaft monitoring, compressor radial vibration, and axial position measurement in critical rotating equipment. The series is manufactured to IEC and CE standards and is compatible with Bently Nevada 3300 and 3500 series monitor racks via signal-level interoperability, extending its footprint across multi-vendor DCS environments.

The Evolution of PR6423 Architecture

The PR6423 series was developed by EPRO GmbH (subsequently acquired by Emerson as part of the Machine Health portfolio) as a standardized eddy current sensor platform for industrial machinery protection. Early variants used fixed-length integral cable assemblies with direct BNC termination. Subsequent generations introduced the modular extension cable architecture, separating the probe body (PR6423/xxx) from the extension cable (TK-xxx) and the signal conditioner (CON0xx), enabling field-replaceable components without full system recalibration.

The PR6423/10R sub-series designates a 10 mm diameter probe with a radial (R) mounting configuration. The suffix -030 indicates a 30 mm nominal cable length code, while -CN specifies the connector type. The conditioner pairing CON021 is a standard EPRO signal conditioner providing a -24 VDC supply rail and a calibrated -4 VDC/mm output scale factor. This architecture remained the production standard through the 2010s. Current Emerson EPRO documentation classifies the PR6423 series as mature/end-of-active-production, with long-term spare parts support available through authorized distributors and specialist MRO suppliers.

PR6423 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked configurations within the EPRO PR6423 eddy current sensor family. Each entry reflects a distinct probe geometry, cable length, or conditioner pairing used in industrial machinery protection applications.

PR6423/00R-030-CN: 8 mm radial probe, 30 mm gap range, standard connector, CON0xx compatible.
PR6423/00R-060-CN: 8 mm radial probe, 60 mm extension cable, standard connector.
PR6423/00R-090-CN: 8 mm radial probe, 90 mm extension cable, standard connector.
PR6423/10R-030-CN CON021: 10 mm radial probe, 30 mm cable, CON021 conditioner, -4 VDC/mm output.
PR6423/10R-060-CN CON021: 10 mm radial probe, 60 mm extension cable, CON021 conditioner.
PR6423/10R-090-CN CON021: 10 mm radial probe, 90 mm extension cable, CON021 conditioner.
PR6423/10R-030-CN CON011: 10 mm radial probe, CON011 conditioner, -8 VDC/mm output scale.
PR6423/10R-030-CN CON031: 10 mm radial probe, CON031 conditioner, dual-channel output.
PR6423/14R-030-CN: 14 mm radial probe, extended sensing range, heavy-shaft applications.
PR6423/14R-060-CN CON021: 14 mm radial probe, 60 mm cable, CON021 conditioner.
PR6423/14R-090-CN CON021: 14 mm radial probe, 90 mm cable, CON021 conditioner.
PR6423/00S-030-CN: 8 mm axial (thrust) probe, 30 mm cable, axial position measurement.
PR6423/10S-030-CN CON021: 10 mm axial probe, CON021 conditioner, thrust position monitoring.
PR6423/10S-060-CN CON021: 10 mm axial probe, 60 mm cable, CON021 conditioner.
PR6423/14S-030-CN CON021: 14 mm axial probe, CON021 conditioner, large-shaft thrust measurement.
PR6423/14S-060-CN CON021: 14 mm axial probe, 60 mm cable, CON021 conditioner.
PR6423/10R-030-CN CON041: 10 mm radial probe, CON041 conditioner, ATEX/IECEx Zone 1 rated.
PR6423/14R-030-CN CON041: 14 mm radial probe, CON041 conditioner, hazardous area certified.

Sourcing Hard-to-Find & Obsolete PR6423 Parts

The PR6423 series has entered the mature/end-of-active-production phase of its lifecycle. OEM lead times for specific cable length and conditioner combinations can extend to 16–26 weeks or result in no-quote responses. DriveKNMS maintains a dedicated inventory of PR6423 probe bodies, extension cables, and CON0xx conditioner units sourced from decommissioned plant assets, authorized surplus channels, and long-term storage stock. All units are catalogued by probe diameter, cable length code, connector type, and conditioner variant. For plants operating legacy EPRO-based machinery protection systems where a full platform migration is not economically viable, DriveKNMS provides lifecycle extension support including cross-reference matching to equivalent Bently Nevada and Metrix sensor configurations where direct substitution is technically validated.

Quality Control for the PR6423 Range

EPRO PR6423 eddy current sensors require specialized verification procedures distinct from standard passive sensor testing. DriveKNMS applies the following protocol to all PR6423 units prior to dispatch: (1) Probe body inspection — coil continuity measurement, insulation resistance test at 500 VDC, and physical inspection of the probe tip and cable jacket for mechanical damage. (2) System-level gap calibration — each probe is bench-tested with its paired CON0xx conditioner against a certified target material (AISI 4140 steel) to verify the output voltage-to-gap linearity curve against EPRO factory specification (typically -4 VDC/mm ±0.5%). (3) Connector integrity — BNC and M12 connector terminations are inspected for pin alignment, solder joint integrity, and shield continuity. (4) Conditioner power rail verification — CON0xx units are tested under rated -24 VDC supply to confirm output scaling, temperature compensation circuit function, and alarm relay operation where applicable. Units that do not meet factory specification tolerances are quarantined and not offered for sale.