Epro PR6426/000-031 Eddy Current Proximity Sensor Probe

Product Overview

The Emerson EPRO PR6426/000-031 is a 32 mm eddy current proximity probe designed for continuous monitoring of shaft movement in high-speed rotating machinery. It is widely applied in turbines, compressors, pumps, and generators where accurate vibration and displacement measurement is required for condition monitoring and protection systems.

The sensing principle is based on eddy current induction, allowing the probe to detect changes in distance to conductive targets without physical contact. This eliminates mechanical wear and ensures stable long-term performance even under severe vibration and thermal stress conditions.

The probe body is constructed from stainless steel with a sealed design, providing strong resistance to oil contamination, moisture, and industrial dust ingress.

Technical Specifications

Model: PR6426/000-031
Sensor Type: Eddy current proximity probe
Measurement Principle: Non-contact electromagnetic induction
Probe Diameter: 32 mm
Measurement Range: Up to ±4.0 mm (system dependent)
Linear Range: Approximately 0.25 mm to 4.0 mm
Frequency Response: DC to 10 kHz (–3 dB typical)
Sensitivity: 4–8 mV/µm depending on signal converter
Target Material: Conductive metals including ferromagnetic alloys
Operating Temperature: -35 °C to +180 °C
Storage Temperature: -40 °C to +200 °C
Housing Material: Stainless steel
Protection Rating: IP67
Output Signal: Compatible with EPRO signal conditioning modules
Weight: 0.8 kg

Performance Characteristics

The PR6426/000-031 is designed for high stability measurement in dynamic rotor environments. It maintains accurate signal response under varying thermal conditions and mechanical vibration loads.

Key performance characteristics include stable linear output across operating range, strong resistance to electromagnetic interference, and minimal signal drift over long-term operation when properly calibrated with matching electronics.

Applications

This probe is used in critical rotating equipment monitoring systems including gas turbines, steam turbines, hydro turbines, industrial compressors, high-capacity pumps, and generator sets.

It supports measurement tasks such as shaft radial vibration, axial displacement, rotor eccentricity, and relative shaft position tracking in predictive maintenance systems.

Engineering Notes

The sensor must be used with a compatible EPRO driver or signal converter to achieve calibrated output values. Installation gap, alignment accuracy, and target surface condition directly influence measurement precision.

Proper commissioning and calibration are required to ensure full linear performance within the specified measurement range.

FAQ

Q1: Is this a contact-based sensor?
No. It operates using eddy current technology and measures displacement without physical contact.

Q2: Can it be used in high temperature turbine environments?
Yes. It is rated for continuous operation up to +180 °C.

Q3: Does it require external electronics?
Yes. It must be paired with an EPRO compatible signal converter for proper output conditioning.