EPRO PR6423/016-011 Proximity Probe

The Epro PR6423/016-011, also cataloged as the PR6423 Eddy-Current Proximity Probe, operates as a dedicated hardware component for continuous non-contact shaft displacement and vibration sensing within turbomachinery protection platforms.

Suffix Breakdown & Model Matrix

Hardware Specifications

Eddy-Current Probe Scaling & Gap Calibration

The Epro PR6423/016-011 probe operates on high-frequency electromagnetic field modulation, relying on precise eddy-current probe scaling to translate physical gap displacement into proportional electrical signals. When interfaced with CON-series transmitters, standard sensitivity achieves 8.0 V/mm (200 mV/mil) over ferromagnetic targets like 42CrMo4 steel. Initial mechanical setup requires accurate gap voltage validation, establishing a static DC bias near -10 VDC at the mid-scale position (1.0 mm gap) to ensure maximum dynamic linear headroom for vibration peak measurement. To prevent cross-talk suppression degradation, a minimum radial distance of 25 mm must be maintained between adjacent probe tips, and the PEEK sensing head requires at least 15 mm of unthreaded side clearance from surrounding metal housings.

Frequently Asked Questions

Q: How is the physical gap voltage validated during mechanical zeroing?

A: Thread the probe into the mounting bracket while measuring the DC voltage output at the connected CON021/CON031/CON041 signal conditioner terminal. Adjust physical depth until the voltage reads -10 VDC (nominal zero position), then lock the mounting assembly.

Q: Can the integral cable on the PR6423/016-011 be trimmed or spliced in the field?

A: No. Splicing or altering the length of the integral cable changes the total system inductance and capacitance, destroying factory tuning and producing inaccurate vibration readings.

Field Installation Guidelines

1. Inspect the PEEK tip and stainless steel threaded body to confirm freedom from physical cracks, oil contamination, or metallic filings.
2. Verify that the housing mounting hole is tapped cleanly and clear of obstruction before threading the probe.
3. Ensure side mechanical clearance of at least 15 mm around the sensing tip to prevent artificial signal loading from neighboring metal structure walls.
4. Carefully thread the probe into position, monitoring real-time DC voltage output from the signal driver unit during insertion.
5. Once the required DC gap voltage (-10 VDC nominal) is established, torque the lock nut to 12 Nm to maintain position stability under machine vibration.
6. Route the high-temperature triaxial cable along grounded structural steel conduit, maintaining physical isolation from high-power AC motor drives.
7. Connect all signal leads inside IP67 junction enclosures, applying single-point grounding to the shield at the monitoring system rack terminal.