Epro PR6453/110-101 12.5 mm Eddy Current Sensor

Configured for shaft vibration and axial displacement measurement in turbomachinery protection systems, the Epro PR6453/110-101 (PR6453 12.5 mm Eddy Current Sensor) provides direct physical execution through non-contact electromagnetic gap sensing.

Suffix Breakdown & Model Matrix

Hardware Specifications

Eddy-Current Probe Scaling & Gap Calibration

The Epro PR6453/110-101 probe functions via high-frequency electromagnetic field modulation, depending on precise eddy-current probe scaling to convert physical gap variations into calibrated voltage outputs. Factory linear calibration establishes a sensitivity factor of 8 V/mm (203.2 mV/mil) across its +/- 1.0 mm linear measurement envelope when targeted against conductive steel shafts. Proper mechanical installation demands gap voltage validation, establishing a static DC bias at -10 VDC at the mid-scale operational point to preserve linear range symmetry for rotor dynamics monitoring. To eliminate electromagnetic mutual coupling and ensure cross-talk suppression, adjacent 12.5 mm probe tips require a minimum axial clearance distance of 30 mm, with radial clearance from surrounding metallic housings maintained beyond 20 mm from the central axis of the tip.

Frequently Asked Questions

Q: How is the static gap voltage zeroed during field installation?

A: Advance the probe body into the mechanical housing while measuring the raw DC voltage output across the signal conditioner module terminals. Adjust physical probe depth until the signal output registers -10 VDC (the nominal mid-span operational point), then secure the mounting jam nut.

Q: Can the integrated cable on the PR6453/110-101 be cut or field-spliced?

A: No. Splicing or trimming the integral cable alters total system capacitance and inductance, invalidating the 8 V/mm scale factor calibration and causing measurement errors.

Field Installation Guidelines

1. Inspect the 12.5 mm tip and stainless steel threaded body for structural damage, contamination, or metal debris prior to mounting.
2. Confirm that the housing thread tapping is clean, clear of burrs, and matches the sensor body thread pitch.
3. Verify radial mechanical clearance of at least 20 mm around the sensing tip to prevent false electrical loading from adjacent housing walls.
4. Carefully thread the probe into position while taking real-time DC gap voltage measurements at the driver unit terminals.
5. Once the target gap voltage (-10 VDC nominal mid-span) is established, tighten the outer jam nut to a maximum torque of 15 Nm without allowing the sensor body to rotate.
6. Route the high-temperature integral cable away from high-voltage AC motor lines, variable frequency drives, and thermal sources exceeding +180 deg C.
7. Terminate all field wiring inside IP-rated junction boxes, grounding the cable shield drain wire exclusively at the monitoring system rack cabinet end.