Emerson | EPRO | PR6423/002-030+CON021 | Eddy Current Sensor

Emerson PR6423/002-030+CON021 Eddy Current Sensor

The Emerson PR6423/002-030+CON021, also cataloged as the PR6423 eddy current sensor, operates as a dedicated hardware component for non-contact displacement measurement within turbine supervisory instrumentation systems.

Hardware Specifications

4-20 mA HART Loop Protocol & Channel Isolation

Although the PR6423 sensor itself is passive, when paired with the CON021 driver it integrates into 4–20 mA HART loop architectures. The driver enforces channel-to-channel isolation, ensuring displacement signals remain stable under mixed wiring conditions. This isolation suppresses cross-talk and preserves calibration accuracy across turbine supervisory systems.

Frequently Asked Questions

Q: Can the sensor be hot-swapped during machine operation? A: Mechanical removal is possible, but displacement monitoring will drop out immediately. Replacement should only occur during a controlled shutdown.

Q: How does cable length affect calibration? A: The specified 1 m cable length is part of the calibration set. Deviations in cable length may alter scaling and require recalibration with the CON021 driver.

Q: What is the recommended target material for calibration? A: Standard calibration is performed against 42CrMo4 steel. Other ferromagnetic materials can be used upon request but require factory calibration.

Field Installation Guidelines

• Maintain probe tip perpendicular to the shaft surface to ensure accurate displacement measurement.
• Avoid bending the PTFE cable beyond its minimum radius to prevent conductor fatigue.
• Route probe wiring separately from high-voltage conductors to minimize induced noise.
• Ensure proper connector engagement to prevent intermittent readings.
• Validate gap voltage using standard –10 VDC targets before commissioning.