Epro CON031+PR6424/000-121 Displacement System

Product Description

The Emerson EPRO displacement solution built around PR6424/000-121 proximity probe and CON031 signal conditioning module is a compact eddy-current measurement chain designed for high-resolution monitoring of rotating machinery dynamics.

The probe provides direct non-contact measurement of shaft movement, while the CON031 unit performs signal linearization, scaling, and conversion into standardized industrial outputs suitable for protection and control systems.

This configuration is widely deployed in API 670-aligned machinery protection applications across turbines, compressors, pumps, and gear-driven equipment.

Operating Principle

The system operates through electromagnetic induction. The probe generates a high-frequency field at the sensing tip, and changes in the distance to the conductive target alter eddy-current response characteristics. These variations are translated into proportional electrical signals and processed by the CON031 module into usable engineering values.

The architecture supports both static positioning and dynamic vibration analysis in harsh industrial environments.

PR6424/000-121 Probe Specifications

Sensing Performance

• Probe type: Eddy-current non-contact displacement sensor

• Probe diameter: 5 mm

• Linear measuring range: 1.0 mm (40 mil)

• Recommended air gap: 0.25–0.5 mm

• Sensitivity: 4 V/mm (typical)

• Frequency bandwidth: DC to 10 kHz

• Minimum shaft diameter: ≥12 mm

• Target material: Magnetic steel (e.g., AISI 4140 / 42CrMo4 equivalent)

Mechanical Construction

• Thread standard: M8 × 1 or 5/16”-24 UNF (variant dependent)

• Cable length: 1 m integrated cable (121 configuration)

• Cable insulation: PTFE high-temperature resistant jacket

• Sensor tip material: PEEK polymer

• Housing material: Stainless steel body construction

• Compact design optimized for tight installation spaces

Environmental Ratings

• Operating temperature (probe): –35 °C to +180 °C

• Cable temperature limit: up to +150 °C

• Protection rating: IP66 (dust-tight and water-jet resistant)

• Mechanical shock resistance: up to 40 g

• Vibration endurance: 20 g across 10–2000 Hz

CON031 Signal Converter Specifications

Electrical Characteristics

• Supply voltage: 24 V DC ±10%

• Output formats: 4–20 mA, 0–20 mA, 0–10 V (version dependent)

• Linearity error: ≤ ±1.5% with matched probe

• Temperature drift: ≤ 0.05% per °C

• Signal bandwidth: DC to 10 kHz

System Compatibility

• Supported probes: PR6422 / PR6423 / PR6424 / PR6426 series

• Measurement ranges supported: 1 mm, 2 mm, 4 mm, 12 mm variants

• Installation type: 35 mm DIN rail mounting

• Protection rating: IP20 enclosure

• Electrical interface: Terminal block connections

Integrated System Performance

When paired, PR6424/000-121 + CON031 provides a calibrated displacement measurement solution with stable long-term behavior.

• Measurement principle: Eddy-current non-contact sensing

• Linear range: 1 mm

• Sensitivity: 4 V/mm

• Frequency response: up to 10 kHz

• Output signals: 4–20 mA / 0–10 V / 0–20 mA

• High thermal tolerance: up to +180 °C (sensor side)

• Factory-matched configuration for installation consistency

Industrial Applications

• Steam and gas turbine shaft vibration monitoring

• Compressor axial displacement and eccentricity detection

• Gearbox bearing clearance and alignment tracking

• Pump and fan rotor dynamic movement measurement

• General rotating equipment position stability monitoring

FAQ

Q: Is external calibration required after installation?
A: No. The probe and converter are factory-matched for direct deployment.

Q: What is the difference between CON031 and other converter versions?
A: CON031 supports multiple PR64xx probe ranges and provides flexible output formats including voltage and current signals.

Q: Can this system be used in high-temperature turbine environments?
A: Yes. The probe supports continuous operation up to +180 °C.

Q: What shaft size is required for accurate measurement?
A: Minimum recommended shaft diameter is 12 mm.