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Product Introduction
The Epro PR6423/000-030-CN+CON021 8 mm Eddy Current Sensor is a high-precision proximity probe designed for continuous, non-contact measurement of shaft vibration, radial displacement, and rotor position in rotating machinery. Built to withstand harsh industrial conditions, this sensor uses the eddy-current principle to detect changes in the distance between the probe tip and a conductive target. The result is a reliable output signal proportional to displacement, enabling predictive maintenance and protection of turbines, compressors, pumps, and other critical equipment. Its rugged construction and high sensitivity make it suitable for long-term use in power generation, petrochemical, and heavy-duty process industries.
Technical Specifications
| Parameter | Description |
|---|---|
| Sensor Type | Non-contact eddy current proximity probe |
| Model | PR6423/000-030-CN + CON021 |
| Sensor Head Diameter | 8 mm |
| Measurement Range | 0 – 2 mm (typical), linear output |
| Frequency Range | DC to 10 kHz |
| Sensitivity | 7.87 mV/µm (nominal) |
| Supply Voltage | ±15 V DC (via CON021 converter) |
| Output Signal | 4–20 mA or voltage proportional to displacement |
| Temperature Range | −35 °C to +180 °C (probe), −35 °C to +85 °C (converter) |
| Pressure Rating | Up to 10 bar (sealed probe) |
| Material | Stainless steel housing with ceramic insulator |
| Protection Class | IP67 (probe tip and cable assembly) |
| Weight | 0.22 kg |
Applications
The PR6423 series is engineered for demanding industrial environments:
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Turbomachinery monitoring: Gas turbines, steam turbines, and compressors for real-time rotor vibration detection.
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Predictive maintenance: Early fault detection in rotating shafts, bearings, and couplings.
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Process industry equipment: Pumps, motors, and gearboxes operating under high vibration or thermal stress.
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Power generation plants: Continuous protection of generator shafts and rotors.
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Petrochemical and refinery systems: Reliable displacement measurement in explosive or corrosive atmospheres when used with appropriate protection.
Advantages
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High Measurement Accuracy: Linear and repeatable output ensures precise vibration monitoring.
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Robust Construction: Stainless steel housing and hermetic sealing resist moisture, oil, and dust.
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Wide Temperature Capability: Withstands extreme ambient conditions, ensuring stable operation.
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Easy Integration: Standardized output signals simplify connection to DCS or PLC systems.
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Low Maintenance: Non-contact design eliminates mechanical wear.
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Flexible Installation: Available with various cable lengths and compatible with multiple proximitor modules.
FAQ
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What principle does the PR6423 sensor use for displacement measurement?
It operates on the eddy current principle, inducing currents in the conductive target and measuring impedance changes to determine distance. -
Can the sensor be used in high-temperature environments?
Yes, the probe operates up to +180 °C and the CON021 converter up to +85 °C. -
What is the typical linear measurement range?
The standard linear range is 0 – 2 mm with factory calibration. -
How is the sensor powered?
It is powered through the CON021 converter with a ±15 V DC supply. -
Does the sensor require regular calibration?
Calibration is recommended during installation and major maintenance, but frequent recalibration is not needed thanks to stable factory settings. -
What type of output signals are supported?
The system provides a voltage or 4–20 mA current output proportional to displacement. -
Is the probe tip resistant to oil or chemical exposure?
Yes, the stainless steel and ceramic construction provides strong resistance to oil, lubricants, and most industrial chemicals. -
Can the PR6423 be used for both vibration and shaft position monitoring?
Absolutely; it can monitor both dynamic vibration and static radial displacement. -
What is the recommended installation clearance from the target?
Typically around 1 mm nominal gap to ensure the full measurement range and linearity. -
Is the sensor suitable for hazardous areas?
Yes, when paired with appropriate intrinsically safe barriers or certified CON021 modules, it meets ATEX/IECEx requirements.
Related Epro Series Models
| Model | Description |
|---|---|
| PR6423/005-010+CON021 | 5 mm probe, short-range high-accuracy version |
| PR6423/010-030+CON021 | 10 mm probe for larger shaft diameters |
| PR6423/000-010-CN+CON021 | Standard 8 mm probe with 1 m cable |
| PR6424/014-040+CON021 | Extended temperature range version |
| PR6424/01CS | Compact sensor head for confined spaces |
| PR6423/000-030-US+CON021 | 8 mm probe, US specification variant |
Popular Epro Models
| Model | Application Highlight |
|---|---|
| MMS3120/022-100 | High-density vibration monitoring module |
| MMS3125/022-020 | Advanced rotor dynamics analyzer |
| PR6425/010-030+CON021 | Heavy-duty eddy current probe |
| PR6426/000-010+CON021 | High-frequency response sensor |
| CON021 | Proximitor converter for all PR642x probes |
| PR9376/010-040 | Portable calibration and test probe |
