EMERSON PR642300R-010 + CON021 – Eddy-Current Proximity Probe System for Rotating Machinery Vibration and Shaft Position Monitoring

The EMERSON PR6423 probe paired with the CON021 converter is a dependable choice for non-contact measurement of shaft vibration and axial position on turbines, compressors, large pumps, and generators. From my experience, this combo is often selected when users want a robust eddy-current system that integrates into existing condition monitoring loops without needing a full control system overhaul. You might notice that the PR6423 sensor handles the harsh, high-temperature machinery zone, while the CON021 sits safely in the cabinet, turning the raw probe signal into clean, usable analog outputs for your DCS, PLC, or protection monitor.

Key Features

• Non-contact measurement – Eddy-current sensing for high-speed shafts where contact sensors are not practical.
• Dual-output concept – The CON021 typically provides an AC vibration signal and a DC gap (bias) voltage for position trending and setup.
• Balanced system design – Probe at the machine, converter in the panel; this separation improves noise immunity and serviceability.
• High-temperature probe capability – PR6423 probe versions are widely used close to hot bearings and seals where ambient can be elevated.
• Industry-proven compatibility – Works with PR6423 series probes and matching extension cables, feeding common DCS/PLC analog inputs or protection modules.
• Flexible mounting – Threaded probe installation at the machine; DIN-rail or panel mounting for the CON021 makes cabinet layout straightforward.
• Stable calibration – Factory-matched probe/extension/converter sets help maintain linearity and sensitivity over time.

Technical Specifications

Application Fields

This set is commonly deployed in critical rotating assets where continuous vibration and position feedback is non-negotiable:

• Steam and gas turbines – radial vibration and thrust position
• Centrifugal and axial compressors – shaft vibration, rub detection
• Large pumps and fans – condition monitoring and protection trips
• Generators and motors – bearing health and rotor movement
• API 670–style protection systems and plant DCS/PLC trending

Advantages & Value

• Reliability in harsh zones – The PR6423 probe is designed for proximity to hot, oily, and high-vibration environments, which typically reduces nuisance faults.
• Straightforward integration – Analog outputs drop into most DCS/PLC analog input cards or third-party vibration monitors.
• Lifecycle economy – Swapping a converter or probe element usually doesn’t require re-engineering the whole protection philosophy, which saves time and budget.
• Service support – Clear gap voltage reference and dynamic signal make troubleshooting and acceptance testing faster on site.

Installation & Maintenance

A few practical suggestions from the field: use a rigid, properly threaded probe mount with adequate adjustability for setting the gap to the target (usually a ferromagnetic shaft material). Route the probe and extension cables away from high-current conductors, and ground the shielding at a single, clean point to avoid loops. The CON021 should be installed in a ventilated cabinet on a 35 mm DIN rail or solid panel with tidy strain relief.

• Cabinet: IP-rated enclosure, dry and ventilated; ambient typically -20 to +50 °C for long-term reliability
• Wiring: maintain shield integrity; follow polarity; keep analog runs segregated from switching supplies
• Commissioning: set the mechanical gap with feeler gauges; verify DC bias voltage in the mid-range; confirm AC signal on run-up
• Routine care: inspect connectors and cable glands, clean probe tips at outages, and document gap/bias checks; firmware is not applicable for analog converters
• Calibration: when replacing components, perform a standard target-material calibration procedure to confirm sensitivity and linearity

Quality & Certifications

• Manufacturing typically under ISO 9001 quality systems
• CE conformity (EMC and Low Voltage) is common for this class of converter
• RoHS compliance for electronic assemblies in most markets
• Manufacturer warranty: 12 months (365 days)

Compatible / Supporting Components

• EMERSON PR6422 / PR6423 probes (various tip sizes and thread options)
• Matched extension cables for PR642x (length and connector type to match “-010” system length)
• Mounting hardware: probe holders, brackets, and adjustable studs for accurate gap setting
• Terminal accessories: shielded cable, grounded DIN rails, and protected test points for AC signal verification