Emerson PR6426/000-030 Eddy Current Displacement Sensor

Configured for precise non-contact measurement in AMS condition monitoring networks, the Emerson PR6426/000-030 (PR6426 Eddy Current Sensor) provides direct physical/electrical execution. The 32 mm sensor head detects dynamic changes in distance to an electrically conductive steel target across a 0 Hz to high-frequency spectrum. By outputting raw high-frequency electromagnetic field responses to an external signal converter module, the transducer captures radial shaft vibration, axial position, and rotor eccentricity in rotating machinery assemblies without mechanical wear.

Hardware Specifications

Probe Calibration & Rotor Dynamic Tracking

The transducer relies on eddy-current probe scaling tuned to an Incremental Scale Factor (ISF) of 2 V/mm. When installed, engineers perform gap voltage validation to position the probe tip within its linear measurement region around the 5.5 mm nominal gap center. This setup ensures optimized signal linearity (< +/- 1.5%) for tracking rotor dynamics on shafts with peripheral speeds reaching 2500 m/s. The physical setup reduces cross-talk suppression issues when probe heads maintain proper center-to-center spacing on target surfaces, preventing electromagnetic field overlap across adjacent sensor channels.

Frequently Asked Questions

Q: Can the PR6426/000-030 probe be connected directly to a PLC analog input module?

A: No, the sensor outputting high-frequency signals must connect to a compatible signal converter, such as the CON 021/91 or CON 011/91, which converts the eddy current response into standard voltage or 4-20 mA signals.

Q: What physical installation limits apply to the target shaft diameter?

A: The recommended target shaft diameter is >= 200 mm for optimal performance, though a minimum diameter of 60 mm is required to avoid field distortion and accuracy degradation.

Q: How does the cable length affect system calibration?

A: The probe includes an integral 3 m cable. Because system calibration depends on total circuit inductance and capacitance, extending or altering the cable length without matching converter tuning distorts the 2 V/mm scale factor.

Field Installation Guidelines

• Mount the sensor flange securely using proper torque specifications onto rigid brackets to eliminate mechanical probe resonance under industrial vibration limits (4-5 g at 60 Hz).
• Route the integral sensor cable through dedicated grounded metal conduits, keeping field wiring separated from high-voltage AC motor drives to minimize noise coupling.
• Maintain a single-point connection to the main instrument grounding bar for cable shielding, ensuring no ground loops exist between the probe body and signal processing racks.
• Confirm that the target shaft material matches the conductive steel calibration standard before finalizing mechanical gap voltage adjustments.