EPRO PR6424 Eddy Current Sensor Modules — PR6424/013-110 CON021

Technical Dossier

Product Details And Specifications

EPRO PR6424 Series: Comprehensive Module Range and Technical Overview

The EPRO PR6424 series is a family of eddy current proximity sensors engineered for continuous, non-contact displacement and vibration measurement in rotating machinery. Deployed across global heavy industry — including petrochemical refineries, nuclear power stations, offshore platforms, and large-scale turbomachinery installations — the PR6424 series forms a critical layer of the machinery protection infrastructure in plants operating under API 670 and ISO 10816 standards. These sensors interface directly with EPRO MMS 6000, Bently Nevada 3500, and compatible vibration monitoring systems, making them a universal component in both OEM and retrofit protection architectures.

The Evolution of PR6424 Architecture

The PR6424 series was developed by EPRO GmbH (Germany) as part of its eddy current transducer system, designed to operate in conjunction with dedicated signal conditioning drivers (CON0xx series). The sensor operates on the eddy current principle: a high-frequency oscillating magnetic field is generated at the probe tip; when a conductive target enters the field, eddy currents are induced, altering the oscillator impedance in proportion to the gap distance.

Early PR6424 variants were specified for 5 mm and 8 mm tip diameters with fixed cable lengths, targeting steam turbine shaft displacement monitoring. As industrial standards evolved, EPRO expanded the series to cover a wider range of cable lengths (from 1 m to 9 m extension cables), connector types (CON011, CON021, CON031, CON041), and target material compensation. Modern PR6424 variants are fully compatible with the EPRO MMS 6000 series and can be cross-referenced to Bently Nevada 3300 XL 8mm probes in many installations. The series is now in a mature/sustained phase — production continues for active variants, but several early cable-integrated configurations have been discontinued. Long-term maintenance support for obsolete sub-variants is a primary sourcing requirement for end users.

PR6424 Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified PR6424 series product range, classified by connector and cable configuration. Each model is a non-contact eddy current proximity probe designed for shaft radial vibration, axial position, and differential expansion measurement.

PR6424/000-010: 5 mm probe, 1 m integral cable, no connector, standard configuration.
PR6424/000-030: 5 mm probe, 3 m integral cable, no connector, extended reach.
PR6424/001-010: 5 mm probe, 1 m cable, CON011 connector interface.
PR6424/002-010: 5 mm probe, 1 m cable, CON021 connector interface, standard pairing.
PR6424/003-010: 5 mm probe, 1 m cable, CON031 connector interface.
PR6424/004-010: 5 mm probe, 1 m cable, CON041 connector interface.
PR6424/010-110: 8 mm probe, 1 m integral cable, CON011 driver compatible.
PR6424/011-110: 8 mm probe, 1 m cable, CON011 connector, standard turbine shaft use.
PR6424/012-110: 8 mm probe, 1 m cable, CON021 connector, high-temperature variant.
PR6424/013-110 CON021: 8 mm probe, 3 m integral cable, CON021 driver interface — the subject SKU; primary use in steam turbine radial vibration monitoring with 3 m standoff.
PR6424/014-110: 8 mm probe, 1 m cable, CON041 connector, high-sensitivity configuration.
PR6424/015-110: 8 mm probe, 5 m cable, CON021 connector, long-extension turbomachinery.
PR6424/017-110: 8 mm probe, 7 m cable, CON021 connector, large-frame generator applications.
PR6424/019-110: 8 mm probe, 9 m cable, CON021 connector, maximum extension configuration.
PR6424/060-000: Axial position probe variant, 5 mm tip, integral cable, thrust bearing monitoring.
PR6424/080-000: High-temperature rated probe, 8 mm tip, for applications up to 180°C ambient.
PR6424/090-110: Stainless-body variant, 8 mm probe, CON021 interface, corrosive environment rating.

Sourcing Hard-to-Find & Obsolete PR6424 Parts

DriveKNMS maintains a dedicated inventory program for the EPRO PR6424 series, with particular focus on discontinued cable-integrated configurations and legacy CON011/CON031 connector variants that are no longer available through standard distribution channels. For plants operating legacy MMS 3000 or early MMS 6000 installations, the PR6424 probe remains the only drop-in compatible sensor without system reconfiguration.

Quality Control for the PR6424 Range

Each PR6424 unit processed by DriveKNMS undergoes a structured verification protocol specific to eddy current transducer systems. Verification steps include: (1) static gap sensitivity calibration using a certified steel target at 0.25 mm, 1.0 mm, and 2.0 mm gaps to confirm output linearity within ±0.5% of EPRO factory specification; (2) oscillator frequency check at the probe tip to confirm the driver-probe system resonance is within the CON021 or applicable driver's tuning range; (3) cable continuity and insulation resistance test (minimum 100 MΩ at 500 VDC) for integral cable variants; (4) connector interface inspection for CON021 bayonet lock integrity and pin condition; (5) thermal soak test at 70°C for 30 minutes to screen latent failures in cable insulation. Units that fail any parameter are quarantined and not offered for sale. Test records are retained for 5 years and available upon request.