Overview
The Epro PR6424/000-000 CON21, also cataloged as the PR6424/000-000 16mm Eddy Current Sensor, operates as a dedicated hardware component for shaft displacement and vibration measurement within an eddy current machinery protection system. The sensor provides non-contact distance measurement between the probe tip and rotating shaft surface through electromagnetic field variation.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PR6424/000-000 CON21 |
| Brand | Epro |
| Origin | Germany |
| Weight | 0.75 kg |
| Dimensions | 29 x 22 x 4 cm (estimated shipping size) |
| Operating Temp | -35 to 180 deg C |
| Sensor Type | 16mm Eddy Current Sensor |
| Sensitivity / Linearity | 4 V/mm (101.6 mV/mil), <= +/-1.5% |
| Air Gap (Center) | Approx. 2.7 mm (0.11 in) nominal |
| Long Term Drift | < 0.3% |
| Static Measurement Range | +/-2.0 mm (0.079 in) |
| Dynamic Measurement Range | 0 to 1,000 um (0 to 0.039 in) |
| Maximum Surface Speed | 2,500 m/s (98,425 ips) |
| Minimum Shaft Diameter | >=80 mm |
| Temperature Excursions | <4 hours at 200 deg C (392 deg F) |
| Sensor Output Type | Analog displacement signal |
Eddy Current Measurement Characteristics
The PR6424/000-000 CON21 uses an eddy current sensing element to detect changes in the electromagnetic field caused by variations in the probe-to-shaft distance. The measurement chain requires correct probe positioning and gap adjustment to maintain signal scaling accuracy.
The sensor provides a 4 V/mm sensitivity characteristic with a defined static range of +/-2.0 mm and dynamic measurement capability up to 1,000 um. The probe configuration supports rotor displacement monitoring where mechanical movement is converted into an electrical measurement signal.
Frequently Asked Questions
Q: What measurement principle is used by the PR6424/000-000 CON21?
A: The sensor uses a non-contact eddy current measurement principle. The probe generates an electromagnetic field, and the distance variation between the probe tip and conductive target surface changes the electrical response.
Q: What is the nominal operating air gap for this sensor?
A: The center air gap is approximately 2.7 mm (0.11 in) nominal. Correct mechanical positioning is required to achieve the specified sensitivity and linearity performance.
Q: Can the sensor operate under high temperature conditions?
A: The specified operating temperature range is -35 to 180 deg C. Temperature excursions up to 200 deg C are supported for periods shorter than 4 hours.
Field Installation Guidelines
Install the PR6424/000-000 CON21 probe with a rigid mechanical mounting arrangement to prevent movement between the sensor body and measurement target. The probe tip should maintain the specified air gap position relative to the shaft surface.
Use shielded signal cabling where required by the measurement system design. Cable routing should avoid high-current power conductors, switching devices, and sources of electromagnetic interference.
During commissioning, verify the probe gap condition, signal scaling, and mechanical alignment before connecting the measurement output to monitoring or protection equipment. Ensure the sensor housing and cable shield grounding follow the installation requirements of the associated Epro monitoring system.
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