Epro PR6423/012-100 Eddy-Current Proximity Probe

The Epro PR6423/012-100, also cataloged as the PR6423 Eddy-Current Proximity Probe, operates as a dedicated hardware component for continuous non-contact shaft displacement and dynamic vibration monitoring within turbomachinery protection systems.

Suffix Breakdown & Model Matrix

Hardware Specifications

Eddy-Current Probe Scaling & Gap Calibration

The Epro PR6423/012-100 system utilizes high-frequency electromagnetic field modulation to convert mechanical shaft displacement into calibrated voltage outputs through CON011 or CON021 signal converters. Correct eddy-current probe scaling ensures a sensitivity factor of 8 V/mm (+/- 5%) when facing 42CrMo4 ferromagnetic steel. Physical setup mandates precise gap voltage validation, bringing the probe to its initial air gap of 0.5 mm to position the static bias voltage at -10 VDC at the mid-point of the 2.0 mm dynamic range. Cross-talk suppression is maintained by ensuring adjacent 8 mm probe centers maintain a minimum distance of 25 mm, while providing at least 15 mm radial clearance around the PEEK sensing tip from surrounding machine casing walls.

Frequently Asked Questions

Q: What is the procedure for establishing the baseline gap voltage during field setup?

A: Thread the probe into the bracket while measuring the DC voltage output at the connected CON011/CON021 converter. Adjust probe position to set an initial air gap of 0.5 mm (+/- 0.1 mm) until the signal converter output reads -10 VDC, then lock the jam nut.

Q: What are the cable installation limits for the 4 m PTFE cable variant?

A: The non-armored PTFE cable must maintain a minimum bending radius of 25 mm to prevent conductor deformation. The cable must not be spliced or shortened, as altering cable geometry changes internal inductance and capacitance, destroying factory scale calibration.

Field Installation Guidelines

1. Inspect the PEEK tip, stainless steel case, and nickel-plated connector to ensure freedom from scratches, dirt, or oil contamination.
2. Confirm the mounting hole thread (M10x1 or 3/8"-24UNF) is clean and free of metal burrs before threading the probe casing.
3. Verify at least 15 mm radial clearance around the PEEK tip to prevent false electrical loading from adjacent housing walls.
4. Carefully adjust probe depth to the target 0.5 mm initial air gap while monitoring live DC output voltage at the driver terminals.
5. Lock the outer jam nut to a maximum torque of 12 Nm once the target -10 VDC gap voltage is set, ensuring the probe body does not rotate.
6. Route the 4 m non-armored PTFE cable away from hot surface conduits exceeding +150 deg C and high-voltage AC motor lines.
7. Connect all terminals inside IP66-rated junction boxes, attaching the cable shield drain wire to the monitoring system cabinet frame only.