EPRO PR6424 Modules PR6424/010-010 CON021

Technical Dossier

Product Details And Specifications

EPRO PR6424 Series Technical Notes

The Evolution of PR6424 Architecture

The PR6424 series was developed by EPRO GmbH (subsequently acquired by Emerson Electric) as part of a standardized eddy-current sensing platform. Early variants were designed for direct integration with analog monitoring panels, providing 4–20 mA or voltage outputs proportional to gap distance. As industrial DCS and PLC architectures matured through the 1990s and 2000s, the PR6424 family was extended with variants supporting higher temperature ranges, extended cable lengths, and improved EMI shielding to meet the demands of increasingly complex plant environments.

The series uses a two-component architecture: a probe (sensor) and a signal conditioner (CON module). The CON021 conditioner paired with the PR6424/010-010 probe represents one of the most widely deployed configurations, offering a measurement range of 0–10 mm with a sensitivity of 8 mV/µm. Compatibility between probe and conditioner variants is governed by cable length and sensitivity matching — substituting components across sub-series without verification risks calibration error and false trips in protection systems.

PR6424 Full Catalog & Functionalities (SKU List)

The following SKUs represent confirmed models within the EPRO PR6424 eddy-current transducer and conditioner family, organized by functional category:

Proximity Probes (Sensors)

PR6424/000-000: Standard eddy-current probe, 5 mm range, M14 thread, general-purpose shaft proximity measurement.
PR6424/010-010: Eddy-current proximity probe, 10 mm range, M14 thread, paired with CON021 conditioner for 0–10 mm gap sensing.
PR6424/010-030: Extended-range probe variant, 10 mm nominal, 3 m integral cable, suited for high-vibration mounting environments.
PR6424/020-000: High-temperature probe variant rated to 180 °C, used in steam turbine and compressor applications.
PR6424/030-000: Long-body probe configuration for deep-bore installations in large rotating equipment housings.
PR6424/040-010: Miniature-format probe for space-constrained bearing housings, 5 mm active range.

Signal Conditioners (CON Modules)

PR6424/010-010 CON021: Standard signal conditioner for PR6424/010-010 probe; outputs –24 VDC bias, 8 mV/µm sensitivity, 0–10 mm range — the reference configuration for API 670 shaft displacement monitoring.
PR6424/000-000 CON011: Entry-level conditioner for 5 mm range probes; 200 Hz frequency response, single-channel output.
PR6424/020-000 CON031: High-temperature-rated conditioner module; extended operating range to 85 °C ambient, used in turbine proximity systems.
PR6424/030-000 CON041: Long-cable conditioner variant; compensates for cable capacitance up to 15 m extension cable runs.
PR6424/040-010 CON051: Miniature conditioner for compact probe variants; DIN-rail mountable, 24 VDC supply.

Extension Cables & Accessories

PR6424/010-010 EXT: Standard extension cable assembly, 5 m, matched impedance for PR6424/010-010 probe-conditioner pair.
PR6424/010-030 EXT: 3 m extension cable for /010-030 probe variant, pre-terminated with EPRO connectors.
PR6424/020-000 EXT-HT: High-temperature extension cable, PTFE insulation, rated to 200 °C, for steam environment routing.

Mounting & Mechanical Hardware

PR6424-MTG-M14: M14 probe mounting bracket, stainless steel, adjustable gap-setting fixture for field installation.
PR6424-MTG-FLANGE: Flanged mounting adapter for bearing housing integration, compatible with all M14-thread PR6424 probes.
PR6424-CAL-KIT: Field calibration kit including reference target disc, gap gauge, and calibration certificate template for API 670 compliance documentation.

Quality Control for the PR6424 Range

EPRO PR6424 components involve precision-matched probe-conditioner pairs where electrical characteristics — sensitivity, bias voltage, frequency response — must fall within tight tolerances to ensure accurate machinery protection readings. DriveKNMS applies a structured test protocol to all PR6424 units prior to dispatch: