Emerson EPRO PR6424/004-010 CON021 Eddy Current Transducer

Product Overview

The PR6424/004-010 (CON021) is a high-precision non-contact Eddy Current Transducer, a core component of the Emerson (formerly Epro) Philips/Bently Nevada legacy vibration monitoring series. Specifically engineered for demanding turbomachinery applications, this 10 mm displacement sensor is designed to measure shaft vibration, axial thrust, and eccentricities in critical assets like steam turbines, centrifugal compressors, and large industrial pumps. By utilizing eddy current induction principles, the PR6424/004-010 delivers a high-resolution signal proportional to the gap between the sensor tip and the target material, enabling early detection of mechanical wear and preventing catastrophic machinery failure.

Technical Configuration

The CON021 variant is optimized for durability and specific cable management:

• Sensor Tip: 10 mm diameter probe, designed for long-range displacement measurements and high sensitivity.

• Cable Architecture: Features a 1.0 m integral cable (often referred to by the /010 suffix) terminating in a specialized connector for extension to the driver/converter.

• Eddy Current Principle: Operates by generating a high-frequency electromagnetic field; as a metallic target approaches, eddy currents are induced, causing a measurable change in the oscillator amplitude.

• Environmental Sealing: The sensor head is hermetically sealed and resistant to oils, chemicals, and high-pressure environments (up to 20 bar at the tip).

• System Integration: Fully compatible with the MMS 6000 and MMS 3000 machinery monitoring systems.

Technical Specifications

Technical FAQs

What is the significance of the "CON021" designation? The CON series refers to the specific configuration of the cable length, connector type, and armor. For the PR6424, CON021 typically denotes the standard industrial configuration with a 1.0 m cable, optimized for use with the CON0x1 series of signal converters.

Does this transducer require a driver (oscillator)? Yes. The PR6424/004-010 is a passive sensor. It must be connected to a matching converter (e.g., CON011 or CON021 drivers) to translate the physical gap change into a standard 4-20 mA or voltage signal (typically -2V to -18V DC).

Can this sensor be used with any target material? Standard calibration is for 42CrMo4 steel (AISI 4140). If the target shaft is made of a different alloy (e.g., stainless steel or aluminum), the sensitivity (mV/mm) will change significantly, necessitating a custom calibration at the converter level.

Engineering & Installation Guide

• Gap Voltage Calibration: During installation, the "Static Gap" must be set using a voltmeter connected to the driver output. For a standard 10 mm probe, the sensor is usually positioned so the output is approximately -10.0 VDC (the center of the linear range).

• Cross-Talk Prevention: If mounting multiple PR6424 probes in close proximity (e.g., X and Y vibration probes), ensure a minimum lateral distance of at least 40 mm between probe centers to prevent electromagnetic interference (cross-talk).

• Cable Protection: The integral cable is sensitive to sharp bends. Maintain a minimum bend radius of 25 mm. In oily or abrasive environments, ensure the cable is routed through flexible stainless steel conduit or "armor" to prevent signal degradation.

• Target Surface Finish: For accurate vibration measurement, the area of the shaft under the sensor tip (the "track") must be free of scratches, rust, and mechanical runout. A surface finish of 0.8 µm Ra or better is recommended.