Overview
The Emerson Epro PR6423/001-121, also cataloged under the PR6423 series, is an 8 mm eddy current displacement sensor designed to measure shaft displacement through non-contact electromagnetic sensing. It converts changes in the probe-to-target gap into an electrical measurement signal for turbomachinery vibration and position monitoring. The sensor operates with a compatible Epro signal converter.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PR6423/001-121 |
| Brand | Emerson Epro |
| Product Type | 8 mm Eddy Current Displacement Sensor |
| Sensor Diameter | 8 mm |
| Measurement Principle | Non-contact eddy current |
| Linear Measurement Range | 2 mm (80 mils) |
| Static Measurement Range | +/- 1.0 mm |
| Dynamic Measurement Range | 0 to 500 um |
| Nominal Gap | 0.5 mm |
| Scale Factor | 8 V/mm (203.2 mV/mil), +/- 5% |
| Thread Specification | 3/8″-24 UNF-2A (provided variant information; verify against the exact probe configuration) |
| Minimum Shaft Diameter | Greater than 25 mm |
| Target Material | Ferromagnetic steel |
| Reference Target Material | 42CrMo4 / AISI 4140 |
| Sensor Operating Temperature | -35 to +180 deg C (with 1 m cable) |
| Cable and Connector Temperature | -35 to +150 deg C |
| Protection Rating | IP66 (IEC 60529) |
| Sensor Tip Material | PEEK |
| Housing Material | Stainless steel |
| Cable Jacket | PTFE; protective metallic armor options |
| Output Interface | Compatible Epro signal converter required |
| Certifications | CE and API 670 compliance stated in supplied data; hazardous-area variants require configuration verification |
Eddy Current Measurement and Signal Scaling
The PR6423/001-121 measures the distance between the probe tip and a conductive ferromagnetic target. As the shaft moves, the probe detects changes in the electromagnetic field and produces a corresponding electrical signal through its compatible converter.
The stated scale factor is 8 V/mm, with a tolerance of +/- 5%. Therefore, the converter output represents displacement relative to the configured measurement gap.
For installation, technicians should verify the probe gap, target material, and converter compatibility before interpreting shaft displacement readings. Additionally, the probe and extension cable configuration must match the associated signal converter.
Frequently Asked Questions
Q: Can the PR6423/001-121 measure shaft displacement without physical contact?
A: Yes. The sensor uses eddy current measurement to detect changes in the gap between the probe tip and a conductive target. Consequently, it measures shaft displacement without mechanical contact.
Q: What target material is specified for the sensor?
A: The supplied data identifies ferromagnetic steel, with 42CrMo4 / AISI 4140 as the reference material. Target material should remain consistent with the calibration requirements of the measurement system.
Q: Can the sensor operate at 180 deg C?
A: The supplied specifications state a maximum sensor operating temperature of +180 deg C when configured with a 1 m cable. However, the cable and connector temperature limit is +150 deg C. Verify the complete assembly’s temperature rating before installation.
Field Installation Guidelines
- Confirm the probe model, thread configuration, cable arrangement, and compatible Epro signal converter before installation.
- Inspect the probe tip, cable jacket, connector, and mounting thread for mechanical damage.
- Install the sensor with its sensing face directed toward the specified ferromagnetic target.
- Establish the probe gap according to the applicable calibration procedure and converter requirements.
- Route the sensor cable separately from high-voltage power conductors and sources of electromagnetic interference.
- Avoid sharp bends, excessive tensile loading, and mechanical abrasion along the cable route.
- Maintain the specified cable and connector temperature limits throughout operation.
- Verify electrical connections and signal polarity before energizing the monitoring circuit.
- Check the measured gap and output response against the applicable system calibration data.
- Confirm that the installed probe assembly maintains the required environmental protection and mechanical clearance.
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