Description

The EMERSON PR6423/002-041 is a high-performance eddy current proximity probe designed for continuous, non-contact measurement of shaft displacement, vibration, and position in rotating machinery such as steam turbines, gas turbines, compressors, pumps, and generators. As part of Emerson’s 3300 XL 8 mm sensor system, this probe delivers exceptional accuracy, stability, and reliability in compliance with API 670 standards for machinery protection systems.

With a 2 mm (80 mils) linear range, stainless steel M10×1 threaded body, and reverse-mount cable configuration, the PR6423/002-041 is engineered for demanding applications where space is limited and environmental conditions are severe—including high EMI, oil mist, and temperatures up to +177°C (350°F) at the probe tip.

Application Scenarios

At a North Sea offshore platform, a main gas compression train experienced unexplained bearing wear during startup transients. Conventional vibration sensors failed to capture subsynchronous whirl due to limited bandwidth and mounting constraints. Engineers installed EMERSON PR6423/002-041 probes in radial X-Y pairs on each bearing housing, leveraging their 10 kHz frequency response and tight 8 mm form factor to fit within existing gland bores. Within weeks, the system detected a 0.4X oil whirl pattern during ramp-up—enabling a lube oil pressure adjustment that eliminated the instability. Over 18 months, mean time between failures (MTBF) increased by 300%. For the reliability team, the PR6423/002-041 wasn’t just a sensor—it was an early-warning sentinel.

Technical Principles and Innovative Values

Innovation Point 1: Reverse-Mount Design for Confined Spaces – The PR6423/002-041’s cable exits from the rear of the probe body, enabling installation in blind holes or behind flanges where standard probes cannot route cabling—common in retrofits of legacy turbines.

Innovation Point 2: Ultra-Stable Calibration Across Temperature Swings – Emerson’s proprietary coil encapsulation and temperature-compensated electronics minimize thermal drift, ensuring consistent readings from cold start to full load.

Innovation Point 3: Seamless Integration with Digital Ecosystems – When paired with a 3300 XL 22 mm or 8 mm extension cable and 3300/3500 monitor, the probe feeds real-time data into Plantweb® and AMS Suite, enabling predictive analytics like bearing wear trending and imbalance detection.

Innovation Point 4: API 670 Compliance Out of the Box – Every PR6423/002-041 is tested to meet API 670 Annex D requirements for linearity, hysteresis, and interchangeability—critical for safety shutdown systems in refineries and power plants.

Application Cases and Industry Value

A Middle Eastern LNG plant replaced aging velocity sensors on its cryogenic BOG (boil-off gas) compressors with EMERSON PR6423/002-041 probes. The eddy current system provided true shaft-relative vibration data—unaffected by casing resonance—allowing operators to distinguish between mechanical imbalance and foundation looseness. This precision reduced unnecessary overhauls by 60%, saving $1.8M annually.

In a U.S. nuclear facility, PR6423/002-041 units were installed on reactor coolant pumps to meet NRC-mandated continuous monitoring. Their immunity to radiation-induced signal degradation and long-term calibration stability made them the only approved solution for this safety-critical application.

Related Product Combination Solutions

EMERSON 3300 XL 8 mm Extension Cable (e.g., 330901-04-04-00-02-05) – required to connect probe to monitor

EMERSON 3300 XL Proximitor® Sensor (e.g., 330900-00-01-00-00) – signal conditioner that powers probe and outputs –2 to –18 V DC

EMERSON 3500/60 Dual Vibration Monitor – accepts input from two PR6423/002-041 probes for X-Y orbit analysis

EMERSON AMS Machinery Manager – software for diagnostics, alarm management, and ISO 10816 compliance

EMERSON PR6423/00R-041 – same probe with reverse-thread for special mounting

EMERSON 3300/16 mm or 50 mm Probes – for larger machines requiring greater range

SKF @ptitude Observer – alternative monitoring platform compatible via Bently-style inputs

Installation, Maintenance, and Full-Cycle Support

Proper installation of the EMERSON PR6423/002-041 requires adherence to Bently Nevada Installation Guidelines:

Ensure target material is 4140 steel (or calibrate for other alloys)

Maintain minimum target diameter of 25 mm (1 inch)

Set gap voltage to –10.0 V DC ±0.2 V during static calibration

Use only Emerson-approved extension cables to preserve signal integrity

Maintenance is minimal but critical: inspect probe tips for oil fouling or mechanical damage during outages, and verify gap voltage trends in AMS for signs of rotor creep or bearing wear.

We supply only genuine EMERSON PR6423/002-041 probes—new in original packaging with factory calibration certificates traceable to NIST standards. Each unit includes Emerson’s 5-year warranty and compatibility assurance with 3300/3500 systems. Our vibration specialists offer free support for installation validation, orbit plot interpretation, and API 670 compliance documentation. Contact us for a machine protection solution that combines decades of Bently Nevada heritage with Emerson’s digital intelligence