EPRO PR6424 Modules | PR6424/000-030-CN CON021 Dual-Channel Shaft Relative Vibration Monitor

Technical Dossier

Product Details And Specifications

EPRO PR6424 Series: Comprehensive Module Range and Technical Overview

The EPRO PR6424 series is a purpose-engineered line of shaft relative vibration monitoring modules deployed across the most demanding continuous-process industries globally. Installed in petrochemical complexes, nuclear power stations, offshore platforms, and large-scale refineries, the PR6424 family forms a critical layer of rotating machinery protection within Bently Nevada-compatible and standalone condition monitoring architectures. These modules interface directly with eddy-current proximity probes to measure shaft displacement in real time, providing the raw data required for API 670-compliant machinery protection systems. The series is recognized for its deterministic signal conditioning, galvanic isolation between field and system buses, and compatibility with both legacy and modern DCS backplane environments.

The Evolution of PR6424 Architecture

The PR6424 series was developed by EPRO GmbH (subsequently integrated into the Bently Nevada / Baker Hughes ecosystem) as a modular, rack-mountable solution for shaft vibration measurement in turbomachinery applications. Early iterations of the architecture focused on single-channel analog output with fixed measurement ranges, designed for integration into proprietary EPRO racks using parallel backplane communication. As industrial standards evolved through the 1990s and 2000s, the PR6424 line expanded to support dual-channel configurations, configurable full-scale ranges (typically 0–2 mm pk-pk or 0–4 mm pk-pk), and selectable gap voltage outputs for probe health monitoring.

The introduction of the CON021 conditioner interface marked a significant architectural shift, enabling the PR6424 to operate within modular conditioning frameworks where the signal processing unit is physically separated from the transducer interface. This decoupled design improved field replaceability and reduced mean time to repair (MTTR) in critical installations. Later variants introduced ATEX/IECEx certification options for use in Zone 1 and Zone 2 hazardous areas, extending the series' applicability to upstream oil and gas environments.

As of 2026, the PR6424 series is in the mature-to-end-of-life phase of its product lifecycle. Original Equipment Manufacturer (OEM) production of certain sub-variants has been discontinued. However, installed base volumes across global heavy industry remain substantial, sustaining strong demand for certified replacement modules, tested spares, and long-term maintenance support. DriveKNMS maintains an active sourcing and testing program specifically for this series.

PR6424 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly encountered models within the EPRO PR6424 series. Each entry includes a concise functional descriptor. Models are organized by primary function.

Shaft Relative Vibration Monitors (Dual-Channel)

• PR6424/000-030-CN CON021: Dual-channel shaft relative vibration monitor, 0–2 mm range, CON021 conditioner interface, CN connector.
• PR6424/000-031-CN CON021: Dual-channel monitor, extended 0–4 mm pk-pk range, CON021 interface, CN connector.
• PR6424/010-030-CN CON021: Dual-channel monitor with ATEX Zone 1 certification, 0–2 mm range, hazardous area rated.
• PR6424/010-031-CN CON021: ATEX-certified dual-channel monitor, 0–4 mm range, for Zone 1 explosive atmospheres.
• PR6424/000-030-AN CON021: Dual-channel monitor, 0–2 mm range, AN-type connector variant for alternate rack configurations.
• PR6424/000-031-AN CON021: Dual-channel monitor, 0–4 mm range, AN connector, standard industrial environments.

Single-Channel Vibration Monitors

• PR6424/001-030-CN: Single-channel shaft relative vibration monitor, 0–2 mm range, direct probe interface.
• PR6424/001-031-CN: Single-channel monitor, 0–4 mm full-scale range, CN connector.
• PR6424/001-030-AN: Single-channel monitor, 0–2 mm range, AN connector variant.

Conditioner / Interface Modules

• CON021: Signal conditioner module paired with PR6424 monitors; provides eddy-current driver circuit and gap voltage output.
• CON011: Earlier-generation conditioner, compatible with select PR6424 base units in legacy rack installations.
• PR6424/000-030-CN CON011: Dual-channel monitor configured with CON011 conditioner; found in pre-2000 installations.

Power Supply & Rack Infrastructure

• PR6424/000-030-CN CON021 (24 VDC): Standard 24 VDC powered variant; most common in DCS-integrated racks.
• PR9376/01-100-000: EPRO rack power supply unit, compatible with PR6424 series racks; provides regulated DC bus.
• PR9268/00-100-000: EPRO 19-inch rack chassis, 6-slot, designed for PR6424 and related module families.
• PR9268/00-200-000: EPRO 19-inch rack chassis, 12-slot, for larger monitoring arrays.
• PR6424/000-030-CN CON021 (HART): HART-enabled variant for integration with asset management systems via 4–20 mA HART loop.

Sourcing Hard-to-Find & Obsolete PR6424 Parts

DriveKNMS operates a dedicated procurement and lifecycle extension program for the EPRO PR6424 series. As OEM production of several sub-variants has been reduced or discontinued, end-users in refinery turnaround, nuclear outage, and power generation maintenance scenarios face extended lead times through standard distribution channels. DriveKNMS addresses this through three primary sourcing mechanisms: direct surplus acquisition from decommissioned plant inventories, cross-referencing with compatible Bently Nevada and third-party equivalents where applicable, and maintaining a tested-and-certified stock of pulled units from verified industrial sources.

All sourced PR6424 modules undergo full functional verification prior to dispatch. DriveKNMS provides documentation of test results on request, including gap voltage output verification, channel-to-channel isolation resistance, and analog output linearity across the rated measurement range. For customers requiring long-term supply agreements to cover multi-year maintenance contracts, DriveKNMS offers consignment stocking arrangements with guaranteed response times.

Quality Control for the PR6424 Range

The PR6424 series presents specific quality control challenges due to its mixed analog/digital signal path, the sensitivity of the eddy-current conditioner circuit to component aging, and the precision required in the gap voltage output calibration. DriveKNMS applies a structured test protocol to every PR6424 unit processed through its facility.

Each module is bench-tested using a calibrated eddy-current probe simulator to verify the full measurement chain from probe interface to analog output. Gap voltage output is measured at three probe gap setpoints (minimum, nominal, and maximum) and compared against OEM specification tolerances. Channel isolation is verified using a 500 VDC insulation resistance test between field-side terminals and the system bus connector. For CON021-equipped units, the conditioner oscillator frequency is verified against the specified 1 MHz ±5% tolerance. Modules exhibiting out-of-tolerance results are quarantined and not offered for sale. All passing units are labeled with a DriveKNMS test certification tag including test date and technician ID.