EPRO PR6426-010-000 Current Sensor

The Epro PR6426-010-000, also cataloged as the PR6426 Eddy Current Sensor, operates as a dedicated hardware component for continuous non-contact displacement and gap distance measurement within turbomachinery protection systems.

Hardware Specifications

Eddy-Current Probe Scaling & Gap Calibration

The Epro PR6426-010-000 sensor functions via high-frequency electromagnetic field induction, relying on precise eddy-current probe scaling to convert non-contact distance changes into linear analog signals. Driven through an external CON-series signal converter, the system provides accurate distance outputs over conductive metallic surfaces. Proper installation requires gap voltage validation during physical alignment, positioning the static DC bias voltage at -10 VDC to establish the mid-span operational point within the linear measurement envelope. To limit mutual electromagnetic interference and maintain cross-talk suppression, adjacent probe tips must maintain a minimum central axis spacing of 25 mm, while providing at least 15 mm radial clearance from surrounding metallic machine housing walls.

Frequently Asked Questions

Q: How is the physical gap zeroed during mechanical positioning?

A: Thread the sensor body into the mounting frame while monitoring the raw DC output voltage across the signal converter terminals. Adjust probe depth until the signal output reads -10 VDC, then secure the mounting jam nut.

Q: Can the integral probe cable on the PR6426-010-000 be trimmed or spliced in the field?

A: No. Cutting or field-splicing the integral cable alters internal system inductance and capacitance, invalidating factory calibration curves and producing measurement errors.

Field Installation Guidelines

1. Inspect the PEEK tip and stainless steel threaded casing for mechanical flaws, contamination, or thread damage prior to insertion.
2. Confirm the mounting bracket tapping is clean, burr-free, and correctly aligned with the target surface.
3. Maintain a minimum radial clearance of 15 mm surrounding the PEEK tip to prevent false side-loading effects from adjacent metal structures.
4. Carefully thread the probe into position, monitoring real-time DC gap voltage readings at the driver converter terminals during insertion.
5. Lock the outer jam nut to a maximum torque of 12 Nm once the target -10 VDC static gap voltage is established, ensuring the probe casing does not rotate.
6. Route the integral cable inside grounded metal conduit, keeping it physically isolated from high-power AC lines and variable frequency drive cables.
7. Terminate all field wiring inside IP-rated junction enclosures, grounding the cable shield drain wire at the main system cabinet frame end only.