EPRO PR6424 Eddy Current Displacement Sensors PR6424/010-040-CN

Technical Dossier

Product Details And Specifications

EPRO PR6424 Series Technical Notes

The Evolution of PR6424 Architecture

The PR6424 series was introduced as part of EPRO's second-generation eddy current product line, succeeding the earlier PR6422 and PR6423 families. The core operating principle — electromagnetic induction between a coil-tipped probe and a conductive target surface — has remained unchanged, but successive revisions addressed three engineering challenges: cable length standardization, connector interchangeability, and EMI immunity in high-frequency drive environments.

Early PR6424 variants used proprietary EPRO extension cables (PR9376 series) with fixed impedance matching. Later revisions introduced the standardized TNC connector interface, enabling field replacement without recalibration in many installations. The introduction of the /CN suffix (e.g., PR6424/010-040-CN) denotes a cable-integrated, non-interchangeable probe-cable assembly — a design choice that eliminates connector resistance variation at the cost of modular replacement. Modern installations in new-build plants increasingly specify the PR6424 alongside digital output conditioning modules, though the analog 4–20 mA and ±24 V output variants remain dominant in brownfield retrofit projects where legacy DCS I/O cards are retained. The series is now in its mature/end-of-production lifecycle; EPRO's current active catalog directs new designs toward the PR6426 and PR9268 families, but the PR6424 remains the primary spare parts requirement for the installed base through at least 2035.

PR6424 Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified, commonly stocked configurations within the PR6424 series. Each entry reflects a distinct probe diameter, cable length, and connector/termination variant.

PR6424/000-010-CN: 5 mm probe, 1 m integrated cable, non-interchangeable assembly, standard gap range 0–1.5 mm.
PR6424/000-040-CN: 5 mm probe, 4 m integrated cable, non-interchangeable, for extended conduit runs.
PR6424/010-010-CN: 8 mm probe, 1 m cable, radial vibration measurement, ±200 µm range.
PR6424/010-040-CN: 8 mm probe, 4 m integrated cable, standard radial vibration sensor, pairs with CON021/CON041.
PR6424/010-100-CN: 8 mm probe, 10 m cable, long-run installation for large turbine pedestals.
PR6424/020-010-CN: 11 mm probe, 1 m cable, increased sensitivity for low-conductivity target materials.
PR6424/020-040-CN: 11 mm probe, 4 m cable, axial position measurement, gap range 0–4 mm.
PR6424/020-100-CN: 11 mm probe, 10 m cable, axial thrust position on large steam turbines.
PR6424/030-010-CN: 14 mm probe, 1 m cable, high-temperature rated to 180 °C continuous.
PR6424/030-040-CN: 14 mm probe, 4 m cable, differential expansion measurement on turbine casings.
PR6424/030-100-CN: 14 mm probe, 10 m cable, long-run differential expansion, nuclear-grade installations.
PR6424/040-010-CN: 25 mm probe, 1 m cable, large-diameter shaft measurement, gap range 0–8 mm.
PR6424/040-040-CN: 25 mm probe, 4 m cable, compressor radial vibration, API 670 compliant.
PR6424/040-100-CN: 25 mm probe, 10 m cable, offshore platform compressor trains, corrosion-resistant housing.
PR6424/050-040-CN: 50 mm probe, 4 m cable, low-frequency displacement on slow-speed machinery, gap range 0–15 mm.
PR6424/060-040-CN: Flush-mount variant, 4 m cable, for installations with restricted axial clearance.
PR6424/080-040-CN: High-temperature variant, 4 m cable, rated to 230 °C, for hot-section turbine measurements.