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Eddy current sensors
Eddy current sensors are advanced devices designed for accurate, non-contact detection of metallic objects and linear displacement. Utilizing electromagnetic induction, these sensors generate eddy currents in conductive materials, resulting in measurable changes in the output signal. Our wide range of eddy current sensors offers exceptional sensitivity and accuracy, making them ideal for applications in industrial automation, aerospace, and automotive sectors. These sensors provide significant advantages, including non-contact operation, which minimizes wear and tear, leading to longer operational life and reduced maintenance costs.
Reliable measurement with eddy current sensors
In addition, eddy current sensors are highly resistant to dust, dirt, and moisture, making them suitable for harsh industrial environments. Available in various configurations and output types, they easily integrate into existing systems, enhancing operational efficiency. Whether you require precise position measurement or thickness gauging, our selection of eddy current sensors offers tailored solutions to meet your specific needs.
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Non-contact measurementEddy current sensors operate without physical contact, reducing wear and tear, which extends their lifespan and lowers maintenance costs.
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Robust environmental resistanceDesigned to withstand harsh industrial conditions, these sensors perform reliably in environments with dust, dirt, and moisture.
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Flexible integration optionsAvailable in various configurations and output types, eddy current sensors easily integrate into existing systems, enhancing operational efficiency and productivity.
Considerations for selecting eddy current sensors
When choosing eddy current sensors for your application, several important factors should be considered to ensure optimal performance and compatibility:
- Measurement range: Identify the required sensing range and choose a sensor that can accurately measure the full extent of displacement or distance.
- Target material and geometry: Consider the type and shape of the metallic material. Eddy current sensors work best with conductive materials, and their effectiveness can vary based on the target’s size and electrical conductivity.
- Sensitivity and resolution: Assess the sensor’s sensitivity and resolution. Higher sensitivity is crucial for detecting smaller displacements in precise applications.
- Output type: Choose from various output signals, including analog voltage, current, and digital formats. Ensure compatibility with your control systems for seamless integration.
- Environmental conditions: Evaluate the operating environment for factors like temperature, humidity, and exposure to contaminants that can impact performance. Select a sensor designed to withstand these conditions.
- Mounting and size: Check the physical dimensions and mounting requirements to ensure the sensor fits your installation space and is easy to mount.
- Response time: For dynamic applications requiring real-time feedback, opt for sensors with faster response times to ensure timely data collection.
By thoughtfully evaluating these factors, you can choose the ideal eddy current sensor that meets your specific needs, ensuring reliable operation and precise measurements for your application.
Contact us today to discover more about our range of eddy current sensors and find the perfect solution tailored to your measurement requirements.
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Frequently asked questions about Eddy current sensors
Answers to the most important technical questions
What accuracies can eddy current sensors achieve?
Depending on the sensor type, eddy current sensors from Althen achieve very high resolutions down to the micrometer or nanometer range. High-precision systems such as the KD-5600 offer non-linearity of up to 0.04% FS and are suitable for demanding differential, position, and vibration measurements. Robust displacement sensors such as the AMS-3946 achieve a resolution of 1 µm, while special solutions such as the Air Gap Tool for air gap measurements offer a resolution of 0.025 mm. The actual achievable accuracy depends on the measuring range, target material, installation situation, calibration, and environmental conditions.
What is the zero gap in eddy current sensors?
The zero gap in eddy current sensors refers to the smallest distance between the sensor and the measurement object. At this point, there are no field lines present, and no measurement can take place.
In practice, this means that the measuring range of an eddy current sensor does not always begin directly at the sensor surface, but often only after a defined initial distance. From that point onward, the sensor measures changes in distance to the conductive target object precisely and linearly.
A correctly set zero gap is important to avoid measurement errors, signal overrange, or mechanical contact between the sensor and the target. Especially in high-resolution displacement, vibration, or position measurements, it ensures that the sensor operates within its optimal working range.
Under what environmental conditions can eddy current sensors operate?
Eddy current sensors are suitable for harsh industrial environments because they measure without contact and are wear-free. They can be used reliably in dust, dirt, moisture, and vibrations, making them ideal for demanding displacement, distance, and position measurements.
Depending on the sensor type, more demanding requirements are also possible, such as measurements under high pressure, in confined installation spaces, or through non-magnetic barriers. Some versions operate in temperature ranges from approximately -20 °C to +80 °C and feature robust stainless steel housings with a high protection rating, such as IP67.
The exact suitability depends on the sensor model, measuring range, target material, installation situation, and environmental conditions. Althen supports you in selecting the right eddy current sensor for your application.