Overview
The Emerson Epro PR6423/014-121, based on the PR6423 series, operates as a non-contact eddy-current proximity sensor for measuring shaft displacement, vibration, and position within turbomachinery protection systems. It converts changes in the electromagnetic field between the probe tip and conductive target into a displacement-dependent electrical signal for processing by a compatible signal converter.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PR6423/014-121 |
| Base Model | PR6423 |
| Brand | Emerson Epro |
| Product Type | 8 mm Eddy Current Proximity Sensor |
| Sensor Tip Diameter | 8 mm |
| Linear Measurement Range | 2.0 mm (80 mils) |
| Initial Air Gap | 0.5 mm (20 mils) |
| Sensitivity | 8 V/mm (203.2 mV/mil), +/- 5% at 0 to 45 deg C |
| Linearity Deviation | +/- 0.025 mm (+/- 1 mil) at 0 to 45 deg C |
| Frequency Response | 0 to 20 kHz (-3 dB) |
| Target Material | 42CrMo4 / AISI/SAE 4140 steel |
| Minimum Shaft Diameter | 25 mm |
| Operating Temp (Sensor and 1 m Cable) | -35 to +180 deg C |
| Operating Temp (Cable and Connector) | -35 to +150 deg C |
| Ingress Protection | IP66, IEC 60529 |
| Probe Tip Material | PEEK |
| Housing Material | Stainless Steel |
| Cable Material | PTFE |
| Compatible Signal Converters | CON021, CON031, CON041 series |
| Measurement Principle | Eddy-current electromagnetic induction |
| Measured Variables | Shaft displacement, vibration, position, eccentricity, and speed |
| Hazardous Area Approvals | ATEX, IECEx, and CSA options; verify exact configuration |
| Referenced Standards | API 670, ISO 10817-1 |
Eddy-Current Measurement Chain and Signal Scaling
The PR6423/014-121 operates as part of an integrated measurement chain comprising the probe, extension cable, and compatible Epro signal converter.
The probe generates an alternating electromagnetic field at its sensing tip. As the conductive shaft moves relative to the probe, the resulting change in electromagnetic coupling produces a displacement-dependent electrical signal.
The specified sensitivity is 8 V/mm, with a linear measurement range of 2.0 mm. Therefore, the installation must maintain the specified initial air gap and use the corresponding probe, cable, and converter configuration.
For rotating machinery monitoring, the resulting signal supports shaft displacement and vibration measurements. However, the actual measurement accuracy depends on the complete calibrated chain and the specified target material.
Frequently Asked Questions (FAQ)
Q: Which signal converters are compatible with the PR6423/014-121?
A: The specified compatible converter families are CON021, CON031, and CON041. Confirm the complete probe and cable configuration against the selected converter documentation.
Q: What is the specified measurement sensitivity?
A: The sensor has a nominal sensitivity of 8 V/mm (203.2 mV/mil), with a tolerance of +/- 5% at 0 to 45 deg C.
Q: Can the sensor operate in high-temperature environments?
A: The sensor and 1 m cable have a specified operating range of -35 to +180 deg C. The cable and connector have a separate operating range of -35 to +150 deg C. Installation must respect the lower applicable temperature limit for each component.
Field Installation Guidelines
1. Mechanical mounting: Secure the probe using the specified mounting arrangement. Verify that the probe tip faces the conductive measurement target without mechanical interference.
2. Air gap adjustment: Establish the specified initial air gap of 0.5 mm before commissioning. Confirm the measurement range and target material against the application requirements.
3. Target verification: Use the specified 42CrMo4 or AISI/SAE 4140 steel target for the stated measurement characteristics.
4. Cable routing: Route the probe cable separately from high-current power conductors and switching circuits where practical. Avoid sharp bends, excessive mechanical tension, and contact with hot surfaces beyond the cable’s temperature rating.
5. Electrical connections: Connect the probe, extension cable, and signal converter according to the applicable Emerson Epro wiring documentation. Verify connector compatibility and cable continuity before energizing the measurement chain.
6. Signal validation: Check the converter output and confirm that the displacement response follows the expected direction and scaling. Verify the complete measurement chain before enabling machinery protection functions.
7. Environmental protection: Maintain the specified IP66 protection at the installed sensor assembly. Verify that cable entries and connectors retain their required environmental sealing.
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