EPRO PR6423/004-000 PR6423 Eddy Current Proximity Sensor
Manufacturer: Emerson
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Part Number: PR6423/004-000
Condition：New with Original Package
Product Type: Proximity Sensors
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
EPRO PR6423/004-000 Eddy Current Proximity Sensor
Configured for non-contact measurement of shaft displacement and dynamic vibration in machinery protection systems, the EPRO PR6423/004-000 (PR6423 Eddy Current Proximity Sensor) provides direct physical/electrical execution. The hardware translates mechanical shaft motion relative to the probe tip into a proportional electrical voltage signal via high-frequency electromagnetic field variations. This physical interaction enables continuous real-time diagnostics of axial displacement, radial vibration, and eccentricity on high-speed rotating shafts.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PR6423/004-000 |
| Brand | EPRO (Emerson) |
| Origin | Germany |
| Weight | 100 g (including 1 m cable) |
| Dimensions | 8 mm tip diameter |
| Operating Temp | Sensor tip: -35 to +180 deg C; Cable: -35 to +150 deg C |
| Power Consumption | Passive sensor element (powered via external driver, typically -24 VDC input) |
| Linear Measurement Range | 2 mm (80 mils) |
| Sensitivity | 8 V/mm (203.2 mV/mil) +/- 5% |
| Deviation from Best Fit Line | +/-0.025 mm (+/-1 mil) |
| Frequency Response | Up to 10 kHz |
| Target Material | Ferromagnetic steel (42CrMo4 / AISI 4140) |
| Protection Class | IP66 (IEC 60529) |
| Materials | Sensor tip: PEEK; Case: stainless steel; Cable: PTFE; Connector: nickel-plated brass |
Eddy-Current Probe Scaling and Gap Voltage Validation
The sensor relies on precise eddy-current probe scaling to guarantee a constant sensitivity of 8 V/mm against standard AISI 4140 steel targets. During system commissioning, technicians must perform gap voltage validation, adjusting the physical position of the probe to target a -10 VDC offset. This precise baseline setting accommodates expected rotor dynamics without risk of signal saturation. Additionally, the integrated coaxial termination and cable design achieve high cross-talk suppression, preventing signal interference when multiple probes are mounted in close proximity on a single turbine bearing housing.
Frequently Asked Questions
Q: How is the physical measurement affected if the target material is not AISI 4140 steel?
A: The standard eddy-current probe scaling is factory-calibrated for AISI 4140 ferromagnetic steel. Non-standard alloys alter the magnetic permeability and electrical conductivity, requiring re-calibration of the driver/transmitter unit to prevent measurement errors.
Q: What is the structural significance of the PEEK sensor tip?
A: The PEEK (Polyether ether ketone) tip encapsulates the internal coil, providing chemical resistance and maintaining mechanical integrity under extreme operating temperatures up to +180 deg C.
Q: Can this sensor be connected directly to a standard DCS analog input card?
A: No. The raw sensor output must be processed through an external driver or transmitter (such as the CON series converter) to convert the high-frequency impedance changes into a standard proportional voltage or current signal.
Field Installation Guidelines
- Mechanical Alignment: Clean the shaft surface of any mechanical runout, scratches, or non-conductive coatings in the target path before mounting.
- Gap Adjustment: Thread the probe slowly into the bracket while monitoring the driver output voltage until the target gap voltage of -10 VDC is reached.
- Cable Routing Protection: Route the PTFE-insulated cable through flexible metal conduit to prevent mechanical abrasion or damage from high-temperature environments.
- Shield Grounding: Connect the outer shield of the extension cable to the safety ground at the monitor cabinet end only, ensuring the sensor end remains isolated to prevent ground loops.