Emerson EPRO CON031/913-040 Eddy Current Signal Converter Module

Overview

The CON031/913-040 eddy current signal conditioner from EPRO (Emerson) is engineered to interface seamlessly with PR6422 through PR6426 non-contact displacement probes. It performs high-fidelity signal conditioning, transforming raw eddy current sensor inputs into stable, industry-standard outputs suitable for continuous machinery condition monitoring and protection systems.

Designed for demanding turbomachinery environments, this module supports precise measurement of shaft vibration, axial and radial displacement, shaft position, eccentricity, and keyphasor signals in accordance with API 670 practices.

Functional Characteristics

The CON031/913-040 converter provides wideband dynamic response and low signal distortion, ensuring accurate reproduction of both static displacement and high-frequency vibration components. Adjustable sensitivity settings allow adaptation to different probe diameters and measurement ranges without compromising linearity or repeatability.

The module supports multiple output formats, enabling direct integration with protection racks, PLCs, DCS systems, and standalone monitoring equipment.

Probe Compatibility

This signal converter is fully compatible with the following EPRO probe series:

• PR6422

• PR6423

• PR6424

• PR6425

• PR6426

When paired with PR6423 probes, linearity performance is maintained within tight tolerances across the full calibrated range.

Technical Specifications

Dynamic Performance

• Frequency Response (–3 dB): DC to 20 kHz

• Rise Time: < 15 microseconds

• Sensitivity Options:

• 4 V/mm

• 8 V/mm

• Linearity Error:

• ≤ 1.0% typical with standard PR6423 probes

• ≤ 2.0% for extended measuring ranges (up to 4.0 mm)

Electrical Parameters

• Supply Voltage Options:

• –23 VDC to –32 VDC for –4 V to –20 V output

• –21 VDC to –32 VDC for –2 V to –18 V output

• Output Interfaces:

• Analog voltage output proportional to displacement or vibration

• 4–20 mA current output for long-distance transmission

• RS485 digital communication interface

Environmental Conditions

• Operating Temperature Range: –30 °C to +100 °C

• Vibration and Shock Resistance: 5 g at 60 Hz, tested at 25 °C

• Protection Rating: IP20 (control cabinet installation)

Mechanical Construction

• Housing Material: Aluminum alloy ALMgSi 0.5 F22

• Mounting Method: Panel mounting with M5 × 20 screws

• Electrical Connection: Screw-type terminals

Typical Industrial Applications

• Steam, gas, and hydro turbines for shaft vibration and axial position monitoring

• Centrifugal and axial compressors in petrochemical facilities

• High-speed pumps and fans requiring continuous displacement supervision

• Gearboxes and rotating equipment in API 670-compliant protection systems

Model and Measurement Reference

• CON031/913-040

• Compatible Probe Example: PR6423

• Maximum Measuring Range: 4.0 mm (extended range configuration)

• Maximum Linearity Deviation: ≤ 2.0% over full scale

Frequently Asked Questions

Can the CON031/913-040 be used for both vibration and displacement measurements?

Yes. The module supports dynamic vibration signals and static or quasi-static displacement measurements using the same hardware configuration.

Is this module suitable for safety-critical machinery protection systems?

Yes. It is commonly installed in API 670-based systems for continuous monitoring and trip logic input.

Does the converter require software configuration?

Basic configuration is achieved via hardware settings; RS485 communication allows parameter access when supported by the monitoring system.