Description
Emerson EPRO PR6423/010-000-CN Product Description
Product Overview
Emerson EPRO PR6423/010-000-CN is an 8 mm eddy-current proximity sensor designed for non-contact measurement of rotating-shaft displacement, vibration, position, eccentricity, and speed. It belongs to the PR6423 sensor family used in Emerson/EPRO machinery protection systems. Emerson specifies the PR6423 for critical turbomachinery applications including steam turbines, gas turbines, hydro turbines, compressors, gearboxes, pumps, and fans.
The PR6423/010-000-CN is a probe/sensor rather than a complete monitoring channel and is normally operated together with a compatible signal converter such as the CON021/CON011 family.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Emerson / EPRO |
| Model | PR6423/010-000-CN |
| Product Type | 8 mm Eddy-Current Proximity Sensor |
| Measurement Principle | Eddy-current, non-contact |
| Probe Tip Diameter | 8 mm |
| Linear Measuring Range | 2 mm (80 mils) |
| Initial Air Gap | 0.5 mm (20 mils) |
| Incremental Scale Factor | 8 V/mm (203.2 mV/mil) |
| Linearity Deviation | ±0.025 mm (±1 mil) |
| Minimum Shaft Diameter | 25 mm |
| Standard Target Material | 42CrMo4 / AISI 4140 steel |
| Protection Class | IP66 |
| Sensor Temperature | -35 to +180 °C |
| Cable/Connector Temperature | -35 to +150 °C |
| Sensor Tip | PEEK |
| Housing | Stainless steel |
| Cable | PTFE |
| Typical Application | Turbomachinery and rotating equipment |
These core specifications are confirmed by Emerson’s current PR6423 specification sheet.
Main Features
Non-Contact Shaft Measurement
The PR6423 uses eddy-current technology to measure the distance between the probe and a conductive rotating shaft without physical contact. This makes it particularly suitable for high-speed machinery where conventional contact sensors would be subject to wear.
Radial and Axial Monitoring
The sensor can be used to measure:
- Shaft radial vibration
- Axial shaft displacement
- Rotor position
- Shaft eccentricity
- Rotational speed
Emerson specifically identifies radial and axial dynamic displacement, position, eccentricity and speed as applications for the PR6423.
PR6423001-000
8 mm Sensor Design
The 8 mm probe is intended for medium-size rotating shafts. Emerson specifies a minimum shaft diameter of 25 mm for the standard configuration.
High-Temperature Operation
The sensor and its first meter of cable can operate from approximately -35 to +180 °C, making the PR6423 suitable for demanding turbine and compressor environments. The cable and connector are specified for temperatures up to approximately +150 °C.
High Measurement Accuracy
The standard PR6423 provides a 2 mm linear measurement range, with an incremental scale factor of 8 V/mm and a deviation from the best-fit straight line of approximately ±0.025 mm.
Part Number Considerations
The PR6423 family uses a detailed ordering code to specify the mechanical and cable configuration. Emerson documentation shows that PR6423 variants can differ in:
- Sleeve thread
- Sleeve length
- Armored/unarmored cable
- Adapter-plug configuration
- Total cable length
- Cable termination
- Mounting arrangement
The historical Emerson ordering matrix confirms these configuration options.
Therefore, PR6423/010-000-CN should be matched exactly when replacing an installed probe, rather than selecting another PR6423 solely because it has the same 8 mm sensing tip.
Compatible Signal Converter
The PR6423 requires a suitable eddy-current signal converter to provide excitation and convert the probe signal into a usable monitoring output.
Emerson’s CON011 documentation explicitly lists PR6423 as a supported sensor and provides standard and extended measuring-range converter options.
A typical measurement chain is:
Rotating Shaft → PR6423/010-000-CN → Extension/Connection → CON021/CON011 → Machinery Protection System → DCS/SCADA
Application Fields
Steam & Gas Turbines
Used for shaft vibration, rotor position and axial/radial displacement monitoring.
Hydro Turbines
Suitable for continuous monitoring of turbine-shaft movement and vibration.
Compressors
Provides non-contact shaft displacement measurements for compressor machinery protection.
Pumps & Fans
Can monitor critical rotating equipment for abnormal shaft movement and vibration.
Gearboxes
Useful for monitoring shaft position, eccentricity and vibration in high-speed transmission equipment.
Related Products
- Emerson PR6422 — 5 mm eddy-current sensor for smaller shafts.
- Emerson PR6423 — 8 mm eddy-current sensor family.
- Emerson PR6424 — larger-range eddy-current sensor family.
- Emerson CON011 — panel-mounted eddy-current signal converter supporting PR6423.
- Emerson CON021 — signal converter commonly paired with PR6423 systems.
- Emerson CSI 6500 Machinery Health Monitor — machinery protection/monitoring platform used with EPRO eddy-current measurement systems.
