Overview
The Emerson Epro PR6423/011-100, based on the PR6423 8 mm eddy current proximity sensor family, measures shaft displacement without mechanical contact. It converts changes in the electromagnetic field between the probe tip and a ferromagnetic target into displacement signals for rotor vibration, axial position, radial movement, and eccentricity monitoring.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PR6423/011-100 |
| Base Model | PR6423 |
| Brand | Emerson Epro |
| Product Type | 8 mm Eddy Current Proximity Sensor |
| Sensor Tip Diameter | 8 mm |
| Thread Size | 3/8″-24 UNF |
| 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 |
| Frequency Response | 0 to 20 kHz (-3 dB) |
| Target Material | 42CrMo4 / AISI 4140 ferromagnetic 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 |
| Housing Material | Stainless steel |
| Sensor Tip Material | PEEK |
| Cable Construction | Armored cable |
| Compatible Signal Converters | CON021, CON031, CON041 series |
| Power Consumption | Determined by the compatible signal converter; not specified for the passive sensor |
Eddy Current Measurement and Gap Voltage Validation
The PR6423/011-100 operates through an electromagnetic coupling between the probe coil and a conductive target. As the shaft moves relative to the probe, the target changes the coil’s electrical response.
The signal converter processes this response and produces a displacement-related output. Consequently, the complete measurement chain requires a compatible probe, extension cable where applicable, signal converter, and monitoring input.
For shaft vibration measurements, technicians should verify the probe gap voltage against the converter manufacturer’s specified calibration range. The nominal 0.5 mm initial air gap is a mechanical setup value, not a universal electrical acceptance limit.
Additionally, technicians should confirm the probe scale factor and target material before interpreting displacement readings. Incorrect target material or calibration assumptions can affect measurement accuracy.
Frequently Asked Questions (FAQ)
Q: Which signal converters are compatible with the PR6423/011-100?
A: The supplied documentation identifies the CON021, CON031, and CON041 series. Confirm the exact converter configuration and cable requirements before installation.
Q: Can the PR6423/011-100 measure shaft vibration without contacting the shaft?
A: Yes. The eddy current sensing principle measures relative shaft displacement without mechanical contact. The probe requires a suitable conductive ferromagnetic target and a compatible signal converter.
Q: What operating temperature limits apply to the probe assembly?
A: The sensor and first 1 m of cable have a specified operating range of -35 to +180 deg C. The cable and connector have a separate limit of -35 to +150 deg C.
Field Installation Guidelines
- Verify the complete model number, thread configuration, cable arrangement, and compatible signal converter before installation.
- Install the probe with its sensing axis directed toward the designated shaft measurement surface.
- Maintain the specified initial air gap during mechanical setup. Confirm the final electrical gap voltage using the compatible converter documentation.
- Ensure the shaft target material matches the specified calibration material.
- Route probe cables separately from high-current motor leads and switching conductors to reduce electrical interference.
- Avoid sharp bends, excessive tensile loading, and mechanical damage to the armored cable.
- Connect cable shields and grounding points according to the monitoring system manufacturer’s installation instructions.
- Verify probe output, gap voltage, and signal polarity before enabling machinery protection alarms or shutdown functions.
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