Emerson Epro CON021 + PR6424/001-030 Eddy Current Measuring System

Configured for non-contact shaft displacement and vibration measurement, the Emerson Epro CON021 + PR6424/001-030 (CON021 + PR6424 eddy current measuring system) provides direct probe excitation, displacement sensing, and voltage signal conversion for rotating machinery monitoring. The PR6424 probe uses a 16 mm sensing tip, while the CON021 converts the probe signal into a proportional voltage output.

Hardware Specifications

Eddy Current Scaling and Signal Interface

The PR6424 generates a displacement-dependent eddy current signal according to the probe-to-target gap. The specified sensitivity is 4 V/mm, allowing the converter to produce a proportional negative voltage output.

The CON021 operates from -23 VDC to -32 VDC and provides a -4 VDC to -20 VDC output range. Therefore, the supplied configuration uses voltage signal transmission rather than a standard 4-20 mA HART loop interface.

The 0 Hz to 20,000 Hz (-3 dB) frequency response supports both static displacement measurements and dynamic vibration signals. In addition, the specified rise time below 15 us defines the converter's transient response.

Frequently Asked Questions (FAQ)

Q: What target material does the PR6424/001-030 require?
A: The supplied specification identifies ferromagnetic steel as the target material and recommends 42CrMo4 steel.

Q: What electrical output does the CON021 provide?
A: The CON021 provides a -4 VDC to -20 VDC output and operates from a -23 VDC to -32 VDC supply.

Q: What is the specified frequency response of the measuring system?
A: The CON021 has a stated -3 dB frequency range from 0 Hz to 20,000 Hz.

Field Installation Guidelines

• Install the PR6424 with its sensing axis directed toward the specified conductive shaft target.
• Maintain the probe gap within the specified measuring range and verify the mechanical center position during commissioning.
• Use the specified M18 x 1.5 sleeve thread for mechanical installation.
• Route probe cables separately from high-current power conductors, contactors, and other strong electromagnetic noise sources.
• Keep the high-frequency probe cable properly supported and avoid sharp bends or mechanical strain at the Lemo connector.
• Connect the CON021 supply with correct polarity and verify the permitted -23 VDC to -32 VDC supply range before energization.
• Terminate the converter output according to the receiving monitoring or protection system's voltage-input requirements.
• Establish cable shielding and grounding according to the machinery monitoring system's grounding architecture. Avoid creating unintended ground loops.
• Verify the probe-to-target gap, output polarity, signal stability, and mechanical clearance before placing the monitored machine into service.