Epro PR6423/011-000 Eddy Current Probe Sensor

Overview

The Emerson EPRO PR6423/011-000 is an 8 mm eddy-current proximity probe engineered for precise, non-contact measurement of shaft-related parameters in rotating machinery. It is designed to capture vibration amplitude, axial displacement, shaft eccentricity, and thermal growth under demanding operating conditions.

Unlike integral cable variants, this configuration is supplied without a fixed cable, allowing flexible integration with extension cables for long-distance routing or high-temperature installations. The probe is typically used with EPRO CON021 or CON031 signal converters to form a complete displacement monitoring system compliant with API 670 practices.

Design Characteristics

The PR6423/011-000 utilizes eddy-current sensing technology to detect changes in the gap between the probe tip and a conductive shaft surface. The sensor is optimized for stable performance in environments with high thermal stress, vibration, and electromagnetic interference.

Its modular cable design makes it particularly suitable for installations requiring customized cable lengths or replacement flexibility.

Technical Specifications

Measurement Performance

• Measurement method: Eddy-current, non-contact displacement sensing

• Probe tip diameter: 8 mm

• Linear measurement range: 2.0 mm (80 mil)

• Recommended initial gap: 0.5 mm

• Sensitivity: 8 V/mm (typical)

• Frequency response: DC to 10 kHz

• Resolution: better than 0.1 µm (with matched converter)

• Linearity deviation: ≤ ±1% full scale (system dependent)

• Minimum shaft diameter: ≥25 mm

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

Environmental & Mechanical Data

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

• Extension cable temperature: up to +150 °C

• Protection class: IP66

• Shock resistance: up to 40 g

• Vibration endurance: up to 20 g (10–2000 Hz)

• Humidity tolerance: up to 95% non-condensing

Physical Characteristics

• Configuration type: Remote cable version (no integral cable)

• Thread options: M10 × 1 or 3/8"-24 UNF (depending on variant)

• Housing material: Stainless steel

• Probe tip: PEEK high-performance polymer

• Connector interface: Designed for extension cable integration

• Dimensions: 41 mm × 159 mm × 108 mm

• Weight: 0.6 kg

System Integration

The PR6423/011-000 requires a compatible signal conditioning module for operation:

• CON021 signal converter

• CON031 signal converter

These modules provide signal linearization, temperature compensation, and output conversion (4–20 mA or voltage signals) for connection to PLC, DCS, or machinery protection systems.

Application Areas

• Steam and gas turbine shaft displacement monitoring

• Compressor rotor vibration and eccentricity analysis

• Gearbox shaft position and alignment tracking

• Pump and fan rotor dynamic measurement

• High-temperature and long-distance sensor installations

FAQ

Q: Does this probe include a cable?
A: No. The 011-000 version is supplied without an integral cable and requires a separate extension cable.

Q: What is the advantage of the remote cable design?
A: It allows flexible cable routing and is better suited for high-temperature or long-distance installations.

Q: Can this probe operate in turbine environments?
A: Yes. It supports temperatures up to +180 °C and is designed for harsh industrial conditions.

Q: What additional components are required?
A: A compatible CON021 or CON031 signal converter is required for proper operation.