Overview
The Emerson EPRO PR6423/010-120-CN, also cataloged within the PR6423 8 mm Eddy Current Proximity Sensor series, measures the distance between a probe tip and a conductive shaft target. It converts changes in the electromagnetic coupling gap into displacement signals for shaft vibration, axial position, and eccentricity monitoring within turbomachinery protection systems.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PR6423/010-120-CN |
| Base Model | PR6423 |
| Brand | Emerson EPRO |
| Product Series | PR6423 Eddy Current Sensor |
| Product Type | 8 mm Eddy Current Proximity Sensor |
| Sensor Head Diameter | 8 mm |
| Thread Type | M10 x 1 (provided designation; verify against manufacturer documentation) |
| Measurement Principle | Non-contact eddy current displacement |
| Linear Measurement Range | 2 mm (typical; confirm configuration) |
| Initial Air Gap | 0.5 mm (typical) |
| Sensitivity / Scale Factor | Approximately 8 V/mm |
| Equivalent Sensitivity | Approximately 203.2 mV/mil |
| Frequency Response | 0 to 20 kHz (-3 dB) |
| Operating Temp | -35 to +180 deg C |
| Target Material | Electrically conducting ferromagnetic steel |
| Example Target Material | 42CrMo4 / AISI 4140 |
| Protection Class | IP66 / IP68 (application dependent) |
| Power Consumption | Not specified; depends on associated signal converter |
| Output Signal | Displacement-proportional signal through a compatible signal converter |
| Compatible Equipment | EPRO CON series signal converters; verify exact configuration |
Eddy Current Measurement and Signal Conditioning
The PR6423 sensor operates through electromagnetic induction. Its probe coil generates an alternating electromagnetic field, which induces eddy currents in the conductive target.
As the shaft moves relative to the probe, the coupling between the coil and target changes. Consequently, the associated signal converter processes the electrical response into a displacement-proportional output.
For machinery monitoring, the measuring chain requires a compatible probe, extension cable where applicable, and signal converter. Therefore, verify the complete chain configuration before interpreting displacement measurements.
The supplied specifications identify an approximate sensitivity of 8 V/mm and a typical frequency response of 0 to 20 kHz. However, the exact calibration and operating limits should be confirmed against the applicable manufacturer documentation.
Frequently Asked Questions
Q: Can the PR6423/010-120-CN measure shaft vibration without physical contact?
A: Yes. The eddy current principle measures changes in the gap between the probe tip and a conductive shaft target without mechanical contact.
Q: Does the sensor operate independently of a signal converter?
A: The probe forms part of a measurement chain. A compatible signal converter is required to condition the probe response into a usable displacement signal.
Q: Which target materials are specified for this sensor?
A: The provided data identifies electrically conducting ferromagnetic steel, including 42CrMo4 and AISI 4140 examples. Confirm calibration compatibility with the actual shaft material.
Field Installation Guidelines
- Mechanical mounting: Install the probe in a suitable threaded mounting arrangement. Confirm thread dimensions and mechanical clearances before installation.
- Probe alignment: Position the sensing face toward the conductive target and maintain the specified operating gap.
- Target surface: Use a target material compatible with the measurement chain calibration.
- Electrical connections: Connect the probe to its compatible signal converter according to the manufacturer’s wiring documentation.
- Cable routing: Keep sensor wiring away from high-current conductors and sources of electromagnetic interference where practical.
- Shielding: Apply the manufacturer’s cable-shield termination and grounding requirements.
- Calibration: Verify the probe, cable, and converter as a complete measuring chain before commissioning.
- Environmental protection: Confirm that the installed assembly meets the required temperature and ingress-protection conditions.
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