Overview
The Emerson Epro PR6423/10R-111, also identified by the base model PR6423/10R-111, is an 8 mm non-contact eddy current displacement sensor. It converts shaft-to-probe distance variations into an electrical measurement signal for vibration monitoring, static displacement measurement, and rotor position analysis. The sensor operates with compatible Epro signal conditioning and machinery monitoring equipment.
Hardware Specifications
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PR6423/10R-111 |
| Brand | Emerson / Epro |
| Product Type | Eddy Current Displacement Sensor |
| Sensor Technology | Non-contact eddy current |
| Probe Tip Diameter | 8 mm |
| Measurement Range | 2 mm |
| Static Measurement Range | +/- 1.0 mm |
| Dynamic Measurement Range | 0 to 500 um |
| Incremental Scale Factor (ISF) | 8 V/mm |
| Scale Factor Tolerance | +/- 5% at 25 deg C |
| Scale Factor Equivalent | 203.2 mV/mil |
| Linearity Deviation (DSL) | +/- 0.025 mm (+/- 1 mil) |
| Frequency Response | 10 Hz to 2 kHz; up to 20 kHz depending on configuration |
| Target Material | Ferromagnetic steel |
| Factory Calibration Material | 42CrMo4 / AISI 4140 |
| Minimum Shaft Diameter | 25 mm |
| Case Thread | 3/8″-24 UNF |
| Mounting Configuration | Reverse mount, according to supplied model description |
| Operating Temperature | -35 to +180 deg C |
| Short-Term Temperature | Up to +200 deg C |
| Protection Rating | IP66, as specified in supplied data |
| Housing Material | Stainless steel |
| Sensor Tip Material | PEEK |
| Weight | Approx. 100 g, excluding extended cable |
| Compatible Equipment | Epro CON series converters and MMS monitoring systems |
Eddy Current Measurement and Signal Scaling
The PR6423/10R-111 uses electromagnetic induction to measure the distance between the probe tip and a conductive target. As the shaft moves, the probe produces a corresponding electrical signal through the compatible signal conditioning system.
The specified incremental scale factor is 8 V/mm, with a tolerance of +/- 5% at 25 deg C. Therefore, the monitoring system must use the applicable probe and converter calibration data when converting voltage variations into displacement values.
For installation and commissioning, verify the probe gap, target material, signal polarity, and measurement scaling against the applicable system documentation.
Frequently Asked Questions
Q: What physical parameter does the PR6423/10R-111 measure?
A: It measures the distance between the probe tip and a conductive ferromagnetic target. The resulting signal supports static displacement, shaft vibration, and rotor position monitoring.
Q: Which target material corresponds to the supplied calibration specification?
A: The supplied data identifies 42CrMo4 / AISI 4140 steel as the factory calibration material. Different target materials may affect measurement scaling.
Q: Can the sensor operate at temperatures above 180 deg C?
A: The supplied specifications state a normal operating range of -35 to +180 deg C and short-term exposure up to +200 deg C. Confirm the applicable duration and installation conditions using the manufacturer’s documentation.
Field Installation Guidelines
- Verify the complete model designation, probe dimensions, and reverse-mount configuration before installation.
- Inspect the probe tip, threaded housing, and cable for mechanical damage.
- Confirm that the shaft target material matches the specified calibration material.
- Install the probe using the applicable mechanical mounting arrangement and maintain the required clearance from moving components.
- Route the sensor cable separately from high-current power conductors and sources of electromagnetic interference.
- Follow the manufacturer’s cable shielding and grounding instructions to limit electrical noise.
- Connect the probe to a compatible Epro signal conditioning system.
- Verify the probe gap voltage, signal polarity, and measurement scaling during commissioning.
- Confirm that the monitoring system uses the correct sensor calibration and frequency-response configuration.
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