EPRO PR6423/108-110 Current Proximity Sensors

The EPRO PR6423/108-110, also cataloged as the PR6423 Eddy Current Sensor, operates as a dedicated hardware component for contactless shaft displacement and dynamic vibration measurement within turbomachinery protection systems.

Hardware Specifications

Eddy-Current Probe Scaling and Rotor Dynamics Integrity

The PR6423/108-110 proximity sensor utilizes electro-magnetic eddy-current probe scaling principles to deliver a precise incremental scale factor (ISF) output of 8 V/mm (203.2 mV/mil) across a 2 mm linear range. Designed to evaluate rotor dynamics and high-speed mechanical deflection, the sensor maintains strict deviation limits (+/- 0.025 mm DSL) when tracking ferromagnetic targets such as 42CrMo4 or AISI 4140 steel. Gap voltage validation during static installation (starting at a minimum 0.5 mm initial air gap) ensures proper bias centering, preventing signal saturation during high-amplitude transient vibrations. High electromagnetic isolation inherent to the stainless steel body and PEEK tip yields superior cross-talk suppression in dual-axis X-Y orthogonal monitoring configurations.

Frequently Asked Questions

Q: What target material is required to ensure the stated 8 V/mm sensitivity?

A: The sensor is factory-calibrated for ferromagnetic steel targets such as 42CrMo4 or AISI/SAE 4140. Non-ferromagnetic target materials or different alloys will shift the incremental scale factor and require signal conditioner re-scaling.

Q: How does operating temperature affect measurement accuracy?

A: The sensor housing withstands extreme operating temperatures from -35 to 180 deg C, with specified scale factor accuracy maintained within +/- 5% across the standard ambient temperature band of 0 to 45 deg C.

Field Installation Guidelines

• Target Surface Preparation: Verify that the shaft target track measures at least 25 mm in diameter, with a smooth, polished finish free of deep tool marks, scratches, or residual magnetism to eliminate false electrical runoff.
• Mechanical Alignment & Gap Setting: Thread the stainless steel sensor body into the mounting bracket or gland assembly. Set the initial physical clearance to approximately 0.5 mm (20 mils) before validating raw bias voltage and tightening locknuts.
• Cable Strain Relief and Shielding: Route the high-temperature PTFE-insulated cable through grounded protective conduit. Ensure the nickel-plated brass connector is securely mated and terminate cable shields at a single chassis ground point inside the monitoring enclosure.