EPRO PR6424 Eddy Current Sensor Modules: PR6424/010-110 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 manufactured by EPRO GmbH (now part of Baker Hughes / Bently Nevada ecosystem). These sensors are deployed globally in heavy industrial environments including petrochemical refineries, nuclear power stations, offshore platforms, and rotating machinery protection systems. The PR6424 series functions as the sensing element within complete vibration and position monitoring chains, typically paired with CON021, CON011, or CON041 signal conditioning units. Their non-contact measurement principle makes them the standard choice for shaft displacement, radial vibration, and axial position monitoring on turbines, compressors, pumps, and motors.

The Evolution of PR6424 Architecture

The PR6424 series was developed as part of EPRO's eddy current sensor platform, designed to be fully compatible with the CON0xx series signal conditioners and the MMS 6000 / MMS 3000 machinery monitoring systems. Early variants were characterized by fixed cable lengths and limited temperature ratings. Subsequent generations introduced extended temperature ranges (up to 177°C tip temperature), improved EMI shielding, and standardized M12 connector interfaces. The series uses a 5 mm nominal sensing gap with a linear range of approximately 0–2 mm, operating at a carrier frequency of 1 MHz. Cable lengths are encoded in the part number (e.g., /010 = 1.0 m, /050 = 5.0 m, /090 = 9.0 m). The CON021 conditioner paired with this sensor provides a –24 VDC output signal scaled at –7.87 V/mm, compatible with API 670 machinery protection standards. As the broader EPRO product line has been absorbed into Baker Hughes Bently Nevada, cross-compatibility and migration paths to the 3300 XL series are a key consideration for long-term plant maintenance strategies.

PR6424 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the PR6424 eddy current sensor series. Each entry reflects a distinct cable length or connector configuration:

PR6424/000-110 CON021: Standard eddy current sensor, 0 m integral cable, CON021 conditioner compatible.
PR6424/010-110 CON021: 1.0 m integral cable, standard tip, –24 VDC output chain with CON021.
PR6424/020-110 CON021: 2.0 m integral cable, eddy current proximity sensor, API 670 compliant.
PR6424/030-110 CON021: 3.0 m integral cable, radial vibration and axial position measurement.
PR6424/050-110 CON021: 5.0 m integral cable, extended reach installation for large machinery housings.
PR6424/060-110 CON021: 6.0 m integral cable, used in turbine bearing pedestals with remote conditioner mounting.
PR6424/080-110 CON021: 8.0 m integral cable, suitable for deep-well pump and vertical motor applications.
PR6424/090-110 CON021: 9.0 m integral cable, standard long-run configuration for compressor trains.
PR6424/010-130 CON021: 1.0 m cable, high-temperature tip variant rated to 177°C, CON021 conditioner.
PR6424/050-130 CON021: 5.0 m cable, high-temperature tip, suitable for hot gas expander and steam turbine applications.
PR6424/090-130 CON021: 9.0 m cable, high-temperature tip, extended installation in high-ambient environments.
PR6424/010-110 CON011: 1.0 m cable, paired with CON011 conditioner for –24 VDC / 4–20 mA dual output.
PR6424/050-110 CON011: 5.0 m cable, CON011 conditioner, used in DCS analog input card integration.
PR6424/010-110 CON041: 1.0 m cable, CON041 conditioner for integration with MMS 6000 monitoring racks.
PR6424/090-110 CON041: 9.0 m cable, CON041 conditioner, full-length run for large rotating equipment trains.
PR6424/010-110 CON021 (ATEX): ATEX-certified variant for Zone 1 / Zone 2 hazardous area installations in petrochemical plants.

Sourcing Hard-to-Find & Obsolete PR6424 Parts

The PR6424 series has entered a mature-to-end-of-life phase as Baker Hughes Bently Nevada transitions customers toward the 3300 XL 8 mm and 3300 XL 11 mm eddy current sensor platforms. However, the installed base of PR6424 sensors in operating plants worldwide remains substantial, and direct replacement with newer platforms requires recalibration of signal conditioners and potential DCS configuration changes — making like-for-like PR6424 replacement the preferred maintenance strategy for most facilities operating on fixed maintenance budgets.

DriveKNMS maintains a dedicated inventory of PR6424 series sensors and CON0xx conditioners sourced from decommissioned plant equipment, authorized surplus channels, and OEM overstock. All units are inspected, tested, and documented prior to dispatch. We support emergency procurement with same-day quotation and international air freight to refineries, power stations, and EPC contractors globally.

Quality Control for the PR6424 Range

Each PR6424 sensor processed by DriveKNMS undergoes a structured verification protocol specific to eddy current proximity measurement devices. Verification steps include: dimensional inspection of the sensor tip and thread (M14×1.5 standard), cable continuity and insulation resistance testing at 500 VDC, gap sensitivity calibration against a certified aluminum target plate (AISI 4140 equivalent), output linearity verification across the full 0–2 mm measurement range, and conditioner pairing confirmation to ensure the sensor-conditioner system meets the –7.87 V/mm scale factor specification. Units exhibiting tip wear, cable jacket damage, or out-of-tolerance sensitivity are rejected and not offered for resale. Test records are retained and available upon request for quality-critical installations.