Eddy current displacement sensor WST

linearcontactlessanalog output

Description
The distance, position or change of position of an electrically conductive material is measured contactlessly and without wear by an eddy current probe. A high-frequency alternating current excites a coil in the sensor head and creates an electromagnetic field that induces eddy currents in the conductive target. The resulting change in the coil's AC impedance is proportional to the sensor-to-target distance and is converted to analog output signals.

How it works
High-frequency excitation generates an alternating electromagnetic field. Eddy currents induced in the conductive object alter the impedance of the sensor coil. Evaluation electronics convert impedance changes into proportional voltage or current outputs for process integration.

Applications

• Contactless measurement of gap, displacement and position on metallic parts
• Coating and thin-film thickness monitoring
• Inspection of textured or machined surfaces
• Detection of imbalance, run-out or vibration on rotating components
• Proximity detection at concealed or enclosed weld seams

Advantages

• High measurement precision and fast response
• Insensitive to ambient light and acoustic disturbances
• Versions with protection up to IP68 for use in harsh environments
• Wear-free, maintenance‑friendly contactless measurement

Eddy Current Probe WST
Measurement range max.: 0...12 mm
Linearity max.: ±1 %
Resolution max.: 0.4 µm
Output: 0...10 V, 4...20 mA, 0...20 mA
Frequency: 5 / 20 / 50 kHz
Protection class: Connector IP44
Working Temperature max.: -20...+125 °C
Available downloads: Data sheet | CAD-Data | Instruction sheet | Connection overview

Eddy Current Probe Waterproof Series WSTIP
Measurement range max.: 0...30 mm
Linearity max.: ±1 %
Resolution max.: 0.4 µm
Output: 0...10 V, 4...20 mA, 0...20 mA
Frequency: 5 / 20 / 50 kHz
Protection class: IP68
Working Temperature max.: -20...+125 °C
Available downloads: Data sheet | CAD-Data | Instruction sheet | Connection overview

Eddy Current Probe High-temperature Series WSTH
Measurement range max.: 0...4 mm
Linearity max.: ±1 %
Resolution max.: 0.4 µm
Output: 0...10 V, 4...20 mA, 0...20 mA
Frequency: 5 / 20 / 50 kHz
Protection class: Connector IP44
Working Temperature max.: -20...+185 °C
Available downloads: Data sheet | CAD-Data | Instruction sheet | Connection overview

Characteristics / Technical specifications

• Principle: Contactless eddy current measurement using a coil in the sensor head; change in AC impedance proportional to distance to conductive target.
• Measurement ranges (depending on model): fixed versions from 0.8 mm to 30 mm.
• Linearity: up to ±1 %.
• Resolution: down to 0.4 µm.
• Outputs: 0...10 V, 4...20 mA, 0...20 mA.
• Frequencies: 5 kHz, 20 kHz, 50 kHz.
• Protection classes: Connector IP44 up to IP68 (WSTIP).
• Operating temperatures: standard up to +125 °C, high-temperature version up to +185 °C.
• Housing materials: stainless steel and polycarbonate options for industrial environments.