Emerson Bently Nevada PR6423 Eddy Current Sensors: PR6423/003-031 CON041

Technical Dossier

Product Details And Specifications

Emerson Bently Nevada PR6423 Series: Comprehensive Module Range and Technical Overview

The Emerson Bently Nevada PR6423 series is a family of eddy current proximity sensors engineered for continuous, non-contact vibration and position measurement in rotating machinery. Deployed across global heavy industry — including petrochemical refineries, nuclear power stations, offshore platforms, and LNG processing facilities — the PR6423 series forms the sensing front-end of the Bently Nevada 3300 XL and ADAPT Series condition monitoring systems. These sensors operate on the eddy current principle: a high-frequency oscillating magnetic field induces eddy currents in a conductive target, and the resulting impedance change is converted to a linear DC voltage output by a paired proximitor/extension cable system. The PR6423 series is rated for continuous operation in environments with high vibration, temperature extremes, and aggressive chemical exposure, making it the reference standard for API 670-compliant machinery protection installations.

The Evolution of PR6423 Architecture

The PR6423 series was introduced as part of Bently Nevada's third-generation proximity transducer system, designed to replace earlier 7200 and 3300 series sensors with improved linearity, extended temperature range, and standardized metric thread bodies. The architecture is a three-component system: the sensor (PR6423/xxx), the extension cable (PR6422/xxx), and the proximitor module (CON021, CON031, CON041, CON081). Early variants used a 5 mm tip diameter with a nominal gap range of 0.25–2.25 mm. Subsequent revisions extended the operating temperature to 177°C (350°F) at the sensor tip and introduced ATEX/IECEx-certified variants for Zone 1 hazardous area classification. The CON041 proximitor, paired with the PR6423/003-031 in this listing, is the standard 3300 XL 8 mm proximitor module providing a scale factor of 7.87 V/mm (200 mV/mil) and a measurement range of 0.25–2.25 mm. Compatibility between sensor body length, cable length, and proximitor type is strictly defined by Bently Nevada's system integration tables — substitution of components outside validated combinations will produce calibration errors. As the broader 3300 XL platform has entered its mature/end-of-active-production phase, long-term maintenance support through authorized spare parts distributors has become the primary supply channel for installed base operators.

PR6423 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed configurations within the PR6423 eddy current sensor family. Each entry reflects a distinct body length, cable length, or system pairing. Functional classification follows Bently Nevada's standard sensor/cable/proximitor architecture.

Eddy Current Sensors — Standard Body Configurations:

• PR6423/001-031: 5 mm tip, 1 m integral cable, standard temperature, metric M14 thread body
• PR6423/002-031: 5 mm tip, 2 m integral cable, standard temperature, metric M14 thread body
• PR6423/003-031: 5 mm tip, 3 m integral cable, standard temperature, M14 thread — most widely deployed configuration for 3300 XL systems
• PR6423/004-031: 5 mm tip, 4 m integral cable, standard temperature, M14 thread body
• PR6423/005-031: 5 mm tip, 5 m integral cable, standard temperature, M14 thread body
• PR6423/007-031: 5 mm tip, 7 m integral cable, extended reach, standard temperature
• PR6423/010-031: 5 mm tip, 10 m integral cable, standard temperature, long-run installations
• PR6423/003-130: 5 mm tip, 3 m cable, high-temperature variant rated to 177°C sensor tip
• PR6423/005-130: 5 mm tip, 5 m cable, high-temperature variant, petrochemical/steam turbine service
• PR6423/003-031-CN0: Chinese domestic certification variant, 3 m cable, standard temperature

Extension Cables (PR6422 Series — paired with PR6423 sensors):

• PR6422/003-110: 3 m extension cable, standard, for use with PR6423 short-body sensors
• PR6422/005-110: 5 m extension cable, standard temperature rating
• PR6422/010-110: 10 m extension cable, standard, long-run machinery installations
• PR6422/015-110: 15 m extension cable, extended reach for large turbine housings

Proximitor Modules (CON Series — system interface electronics):

• CON021: 3300 XL 8 mm proximitor, standard output, DIN rail mount, -24 VDC supply
• CON031: 3300 XL 8 mm proximitor, extended temperature housing variant
• CON041: 3300 XL 8 mm proximitor, standard configuration, 7.87 V/mm scale factor — paired with PR6423/003-031 in this listing
• CON081: 3300 XL 8 mm proximitor, dual-channel output, used in redundant protection loops

Sourcing Hard-to-Find & Obsolete PR6423 Parts

Quality Control for the PR6423 Range

Each PR6423 sensor and CON-series proximitor processed by DriveKNMS undergoes a structured verification protocol before dispatch. Sensor tip impedance is measured at the nominal operating frequency to confirm coil integrity. Cable continuity and insulation resistance are verified across the full conductor length. Proximitor modules are bench-tested with a calibrated target at the reference gap to confirm scale factor output within ±1% of the 7.87 V/mm specification. Gap-voltage linearity is checked across the full 0.25–2.25 mm measurement range. Units exhibiting drift, non-linearity, or connector damage are quarantined and not offered for sale. For CON041 and CON081 dual-output modules, both output channels are independently verified. Test records are retained and available upon request for quality-critical installations.