Overview
The Emerson EPRO CON021 + PR6423/00M-030, also cataloged as the PR6423/00M-030 Eddy Current Proximity Transducer System, operates as a dedicated hardware component for non-contact shaft displacement measurement within rotating machinery monitoring systems. The system converts probe-to-target distance variations into conditioned electrical signals for vibration, position, and speed analysis.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | CON021 + PR6423/00M-030 |
| Brand | Emerson EPRO |
| Origin | Germany |
| Product Type | Eddy Current Proximity Transducer System |
| Sensor Type | 8 mm Eddy Current Displacement Probe |
| Measurement Principle | Non-contact electromagnetic eddy current measurement |
| Linear Measuring Range | 2 mm |
| Incremental Scale Factor | 8 V/mm (203.2 mV/mil) |
| Target Material | Ferromagnetic steel, typically 42CrMo4 / AISI 4140 |
| Minimum Shaft Diameter | >= 25 mm |
| Probe Tip Material | PEEK |
| Probe Housing Material | Stainless steel |
| Sensor Protection | Up to IP68 for probe and cable assembly |
| Probe Operating Temp | -35 deg C to +180 deg C |
| Converter Operating Temp | -25 deg C to +85 deg C |
| Converter Power Supply | 24 VDC nominal |
| Frequency Response | Up to 10 kHz to 20 kHz (-3 dB) |
| Converter Mounting | DIN-rail or panel mounting |
| Converter Protection | IP65 |
| Output Signal | Configurable analog voltage or current output |
EPRO Eddy Current Measurement and Signal Conditioning
The PR6423/00M-030 probe operates with an eddy current sensing circuit that detects changes in the electrical field between the probe tip and a conductive rotating target. The measurement chain uses the probe gap variation to generate a proportional displacement signal.
The CON021 signal converter supplies excitation power to the probe and processes the high-frequency measurement signal. The conditioned output can be integrated into turbine supervisory instrumentation (TSI) systems for monitoring radial vibration, axial displacement, shaft position, eccentricity, and rotational speed.
The eddy current scaling requires correct probe gap adjustment and target material matching. During commissioning, technicians verify the displacement relationship between physical gap distance and output voltage to maintain measurement accuracy.
Frequently Asked Questions
Q: What physical parameter does the PR6423/00M-030 measure?
A: The PR6423/00M-030 measures the distance between the probe tip and a conductive rotating target using an eddy current field. The output represents shaft displacement, vibration, or position changes.
Q: Does the CON021 converter require a separate power supply?
A: Yes. The CON021 signal converter requires a 24 VDC supply for probe excitation and signal conditioning operation.
Q: Can the probe be installed directly on any shaft material?
A: The probe requires a compatible conductive target material. Standard calibration data is based on ferromagnetic steel targets such as 42CrMo4 / AISI 4140.
Field Installation Guidelines
Install the PR6423/00M-030 probe with the sensing tip aligned perpendicular to the monitored shaft surface. Maintain correct mechanical clearance between the probe face and the target according to the system calibration requirements.
Use shielded signal wiring between the probe converter and monitoring equipment. Connect cable shielding according to the plant grounding standard to reduce electromagnetic interference from motors, generators, and variable frequency drives.
Route eddy current signal cables separately from high-voltage power cables and switching circuits. Avoid unnecessary cable loops and mechanical stress on the probe cable connection.
Before operation, verify probe polarity, converter wiring, supply voltage, and output scaling. Confirm that the measured gap voltage corresponds to the expected mechanical position range before enabling machine protection functions.
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