Emerson Expands Its Machinery Monitoring Range with the PR6426/010-040 Eddy Current Sensor

Dec 06, 2025

Emerson Advances Monitoring Solutions for Critical Industries
Emerson, a global leader in automation technology and industrial solutions, has once again demonstrated its commitment to innovation with the release of the PR6426/010-040 32mm eddy current sensor. Designed for engineers, plant operators, and maintenance teams in the energy, oil and gas, and heavy machinery sectors, this sensor provides reliable, non-contact measurement capabilities for some of the world’s most demanding rotating equipment applications.

New Sensor Delivers Precision in Shaft Displacement Measurement
In August 2024, Emerson officially launched the PR6426/010-040, a high-performance eddy current sensor engineered to measure radial and axial shaft displacement, eccentricity, and motion. With a sensitivity of 2 V/mm (50.8 mV/mil) ±1.5%, and a measuring range of ±4.0 mm (0.157”), it supports real-time diagnostic strategies in predictive maintenance systems.
A nominal air gap of 5.5 mm (0.22”) ensures consistent performance, while long-term drift stays below 0.3%, maintaining stable measurement output over extended operating periods.

Designed for High-Speed Turbomachinery Around the World
The sensor is suitable for equipment found in power plants, refineries, offshore platforms, and large industrial sites. It is optimized for ferromagnetic steel targets such as 42CrMo4, supports shaft diameters of ≥200 mm (7.87”), and can handle surface speeds up to 2,500 m/s (98,425 ips)—a requirement for large, fast-rotating shafts common in turbomachinery.
Its stainless steel construction and PTFE cable contribute to long service life in harsh conditions, while optional armored variants offer additional security in demanding installations.

Built for Harsh Environments and Reliable Long-Term Operation
Thermal and environmental resilience is a key strength of the PR6426/010-040. The sensor operates across -35°C to 175°C (-31°F to 347°F) and tolerates short-term temperature spikes of 200°C (392°F). The cable itself is also rated for 200°C (392°F), ensuring integrity under elevated temperatures.
Additional environmental specifications include:
Temperature zero-point error: –0.3% per 100 K (from +23°C to +100°C)
Temperature sensitivity error: <0.15% per 10 K
Pressure resistance: up to 6,500 hPa (94 psi) at the sensor head
Shock / vibration resistance: 5g @ 60 Hz at 25°C
These characteristics make the device suitable for long-term monitoring in plants facing high heat, pressure, and mechanical load.

Safe Integration with Global Hazardous Area Standards
The PR6426/010-040 ships with a 4-meter cable for the /010-040 variant and a LEMO connector, with optional armored protection for hazardous locations. The sensor is compatible with hazardous-area standards such as ATEX, IECEx, and CSA, enabling operation in explosive or classified environments when paired with approved converters and monitoring systems.
Clear installation guidelines—including correct air gap, target material, and shaft size—ensure smooth integration into both new and existing machinery protection systems.

Conclusion
Emerson’s PR6426/010-040 eddy current sensor brings a durable, precise, and safety-certified solution to industries relying on heavy rotating equipment. Its robust environmental tolerance, stable measurement accuracy, and broad compliance with hazardous-area requirements help users improve machine reliability, reduce unexpected downtime, and maintain consistent operational performance across a wide range of industrial applications.

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Emerson Expands Its Machinery Monitoring Range with the PR6426/010-040 Eddy Current Sensor

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