Overview
The Epro PR6424/000-010, also cataloged as the PR6424 16 mm eddy current displacement sensor, measures shaft displacement through electromagnetic induction. It converts changes in probe-to-target distance into an electrical signal for processing by a compatible Epro signal converter. The measurement supports radial and axial shaft vibration, static displacement, rotor position, and eccentricity monitoring.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PR6424/000-010 |
| Brand | Epro / Emerson |
| Product Type | 16 mm Eddy Current Displacement Sensor |
| Probe Tip Diameter | 16 mm |
| Linear Measurement Range | Static: +/- 2.0 mm |
| Dynamic Measurement Range | 0 to 1,000 um |
| Sensitivity | 4 V/mm +/- 1.5% |
| Incremental Scale Factor | 101.6 mV/mil |
| Nominal Air Gap | Approx. 2.7 mm |
| Frequency Response | 0 Hz to 20 kHz, system dependent |
| Target Material | Ferromagnetic steel |
| Reference Target Material | 42CrMo4 / AISI 4140 |
| Minimum Shaft Diameter | 80 mm |
| Operating Temp | -35 to +150 deg C |
| Sensor Head Pressure Resistance | Up to 10,000 hPa |
| Housing Material | Stainless steel sleeve |
| Cable Material | PTFE |
| Signal Conditioning | Compatible Epro signal converter required |
| Approvals | CE; hazardous-area options depend on system configuration |
| API 670 Compliance | Listed in supplied product information; verify complete system configuration |
Eddy Current Measurement and Signal Conditioning
The PR6424/000-010 operates through electromagnetic coupling between the probe coil and a conductive shaft target. As the shaft moves, the probe-to-target gap changes and alters the electromagnetic response.
The compatible signal converter processes this response and provides a displacement-related output.
For installation and signal validation:
- Maintain the specified probe-to-target geometry.
- Verify the nominal operating gap against the applicable system documentation.
- Use the specified target material and calibration configuration.
- Check the complete probe, extension cable, and converter combination.
- Confirm signal polarity and scaling before connecting the measurement output to a machinery protection system.
The stated 4 V/mm sensitivity applies to the specified measurement configuration. Actual system performance depends on the complete probe and converter arrangement.
Frequently Asked Questions (FAQ)
Q: Can the PR6424/000-010 measure both static displacement and dynamic shaft vibration?
A: Yes. The supplied specifications identify a static measurement range of +/- 2.0 mm and a dynamic measurement range of 0 to 1,000 um. The probe measures shaft movement without mechanical contact.
Q: Does the PR6424/000-010 operate independently of a signal converter?
A: No independent measurement output is specified. The probe operates as part of a compatible eddy current measurement system. Confirm converter compatibility before commissioning.
Q: What target material should the probe measure?
A: The supplied specifications identify ferromagnetic steel, with 42CrMo4 / AISI 4140 listed as the standard calibration reference material. Verify target material compatibility when configuring the measurement system.
Field Installation Guidelines
- Inspect the probe body, cable insulation, and connector for physical damage before installation.
- Confirm that the mounting arrangement matches the equipment drawing and probe configuration.
- Position the probe toward the intended shaft measurement surface.
- Establish the operating gap using the applicable Epro installation procedure.
- Route probe cables separately from high-voltage power conductors and sources of electromagnetic interference.
- Maintain cable shielding and grounding according to the signal converter documentation.
- Verify probe continuity, connector condition, and converter compatibility before energizing the measurement system.
- Check the output signal and measurement scaling before enabling machinery protection functions.
Do not apply unverified torque values, mounting dimensions, or cable extension limits. Use the manufacturer documentation for the complete probe and converter assembly.
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