EPRO PR6424 Transducer Sensors: PR6424/010-040-CN 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 transducer sensors engineered for non-contact displacement and vibration measurement in rotating machinery. Manufactured under the EPRO brand (a Baker Hughes / Bently Nevada ecosystem-compatible product line), the PR6424 series holds a significant installed base across global heavy industries including petrochemical refineries, nuclear power stations, offshore platforms, and large-scale turbomachinery installations. These sensors operate on the eddy current principle, providing continuous, high-resolution shaft position and vibration data to condition monitoring systems such as the EPRO MMS 6000 and compatible Bently Nevada 3500 series monitors.

The PR6424 series is designed for permanent installation in hostile environments: high temperature, high humidity, and chemically aggressive atmospheres. Cable lengths, thread sizes, and connector types vary across the catalog to accommodate diverse OEM and retrofit requirements. The series is fully compatible with EPRO CON0xx signal conditioning modules, which convert raw transducer output into standardized 4–20 mA or voltage signals for DCS and PLC integration.

The Evolution of PR6424 Architecture

The PR6424 series traces its lineage to the early EPRO eddy current sensor platforms developed in Germany in the 1980s, when non-contact measurement became a standard requirement for API 670-compliant machinery protection systems. Early variants used fixed-length integral cables and required manual calibration against specific target materials. Subsequent generations introduced modular cable assemblies (the CON0xx conditioner pairing system), allowing field replacement of the transducer without recalibrating the entire measurement chain.

The current PR6424 architecture separates the probe body, extension cable, and signal conditioner into discrete, interchangeable components. This modularity is critical for lifecycle management: when a probe tip is damaged, only the probe is replaced; the conditioner and cable remain in service. Thread standards (M8, M10, M14) and cable lengths (1 m, 5 m, 9 m) are encoded in the part number suffix, enabling precise cross-referencing. As the series has entered a mature/end-of-life phase for some sub-variants, DriveKNMS maintains stock of discontinued configurations to support long-term maintenance contracts at facilities where full system replacement is not operationally feasible.

PR6424 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed configurations within the PR6424 series. Each entry includes the conditioner pairing where applicable.

PR6424/000-040-CN CON011: M8 probe, 1 m cable, standard gap range, paired with CON011 conditioner for 4–20 mA output.
PR6424/010-040-CN CON021: M8 probe, 1 m integral cable, extended temperature rating, CON021 conditioner, voltage output signal conditioning.
PR6424/010-040-CN CON031: M8 probe, 1 m cable, CON031 conditioner for dual-channel DCS interface.
PR6424/020-040-CN CON011: M10 probe body, 2 m cable, standard sensitivity, CON011 conditioner.
PR6424/020-040-CN CON021: M10 probe, 2 m cable, CON021 conditioner, suitable for high-vibration environments.
PR6424/050-040-CN CON011: M10 probe, 5 m extension cable assembly, CON011 conditioner, used in deep-access installations.
PR6424/050-040-CN CON021: M10 probe, 5 m cable, CON021 conditioner, voltage output, common in turbine bearing housings.
PR6424/090-040-CN CON011: M10 probe, 9 m cable, CON011 conditioner, long-reach configuration for large compressor trains.
PR6424/090-040-CN CON021: M10 probe, 9 m cable, CON021 conditioner, extended range displacement measurement.
PR6424/010-040-CN CON041: M8 probe, 1 m cable, CON041 conditioner with ATEX/IECEx certification for Zone 1 hazardous areas.
PR6424/050-040-CN CON041: M10 probe, 5 m cable, CON041 conditioner, ATEX Zone 1, petrochemical plant standard.
PR6424/090-040-CN CON041: M10 probe, 9 m cable, CON041 conditioner, ATEX Zone 1, offshore and refinery applications.
PR6424/010-040-CN CON051: M8 probe, 1 m cable, CON051 high-temperature conditioner, rated for ambient up to 120°C.
PR6424/050-040-CN CON051: M10 probe, 5 m cable, CON051 conditioner, high-temperature variant for hot gas path proximity.
PR6424/090-040-CN CON051: M10 probe, 9 m cable, CON051 conditioner, long-reach high-temperature configuration for steam turbine applications.
PR6424/010-040-CN CON061: M8 probe, 1 m cable, CON061 conditioner with SIL 2 functional safety rating for safety instrumented systems.
PR6424/050-040-CN CON061: M10 probe, 5 m cable, CON061 SIL 2 conditioner, used in ESD-integrated machinery protection loops.

Sourcing Hard-to-Find & Obsolete PR6424 Parts

Several PR6424 sub-variants have been discontinued by EPRO/Baker Hughes as the product line consolidates toward next-generation sensor platforms. However, the installed base at refineries, power stations, and chemical plants running legacy MMS 6000 or equivalent systems creates sustained demand for exact-match replacements. DriveKNMS maintains a dedicated inventory of end-of-life PR6424 configurations sourced through authorized surplus channels and OEM overstock programs.

For facilities operating under long-term maintenance agreements where sensor substitution requires re-engineering and re-certification, DriveKNMS provides like-for-like replacements that eliminate the need for system reconfiguration. All sourced units are accompanied by full traceability documentation. Customers requiring specific cable lengths, thread sizes, or conditioner pairings not listed above are encouraged to submit a detailed inquiry with the existing part number and installation drawing reference.

Quality Control for the PR6424 Range

The PR6424 series presents specific quality verification challenges due to the precision of the eddy current sensing element and the sensitivity of the CON0xx signal conditioning circuitry. DriveKNMS applies a structured test protocol to all PR6424 units prior to dispatch:

Each probe is bench-tested against a calibrated steel target (AISI 4140) at defined gap distances (0.25 mm, 1.0 mm, 2.0 mm) to verify output linearity within the manufacturer's specified sensitivity band (typically 7.87 V/mm ±5%). The integral cable assembly is subjected to insulation resistance testing at 500 VDC to confirm sheath integrity. Conditioner modules (CON011, CON021, CON041, CON051, CON061) are powered at rated supply voltage (typically -24 VDC) and output signals are verified against calibration curves. For ATEX-certified variants, certification markings and documentation are cross-checked against the original EPRO certificate of conformity. Units that do not meet specification are quarantined and not offered for sale.