Epro PR6423/002-030+CON021 Eddy Current Sensor System

Configured for non-contact radial/axial shaft displacement monitoring in AMS 6500 platforms, the Epro PR6423/002-030+CON021 (PR6423 Eddy Current Sensor System) provides direct physical/electrical execution. The assembly couples an 8 mm inductive proximity transducer with an integral 2 m cable and a CON021 signal converter to detect small physical gap variations over conductive targets. The sensor output maps dynamic shaft vibration and target displacement into linear electrical modulation signals.

Hardware Specifications

4-20 mA HART Loop Protocol and Channel-to-Channel Isolation

When interfaced with plant DCS infrastructures through the CON021 signal conditioning block, high-frequency electromagnetic field variations undergo conversion into standard process signals. The multichannel module architecture utilizes galvanic separation to achieve full channel-to-channel isolation. This setup isolates individual sensing loops, preventing ground loop noise and dynamic signal cross-talk across multi-axis bearing monitoring layouts.

Frequently Asked Questions

Q: What target surface material is required for nominal sensitivity scaling?

A: The standard Incremental Scale Factor (ISF) of 8 V/mm is factory calibrated against 42CrMo4 (AISI/SAE 4140) ferromagnetic steel. Alternate target material recalibration is available upon request.

Q: What are the thermal operating limits for the cable and connector relative to the probe head?

A: The PEEK probe head and the initial 1 m segment of PTFE cable sustain operating temperatures from -35 to +200 deg C. The remaining cable extension and nickel-plated brass connector are limited to -35 to +150 deg C.

Q: How does initial air gap selection impact linear range performance?

A: Presetting an initial static air gap of 0.5 mm (20 mils) places the sensor tip at the start of its linear range, providing a 2 mm (80 mils) dynamic linear measuring span for shaft movement tracking.

Field Installation Guidelines

• Mechanical Thread Engagement: Hand-thread the stainless steel sensor body into the mounting fixture, ensuring a minimum of 5 full mechanical threads of engagement before torqueing the jam nut.
• Gap Voltage Offset Setup: Adjust physical probe insertion depth during static machine shutdown while monitoring the DC voltage output at the CON021 converter terminals to verify the required midpoint bias offset.
• Cable Protection & Minimum Bend Radius: Enclose the PTFE lead cable inside flexible metallic conduit to protect against mechanical degradation. Maintain a minimum bend radius of 25 mm to prevent structural coaxial damage.
• Shield Grounding Discipline: Terminate the outer coaxial cable shield at a single point to the CON021 chassis ground to block electromagnetic interference and eliminate common-mode noise loops.