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This technology has not yet been exploited to its full potential as the example of modern Factor 1 sensors illustrates. |
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To put it plainly, the development of inductive sensors was simply an effort to find a replacement for mechanical end switches. Inductive sensors detect metals without any physical contact and do not have any mechanical moving parts, meaning that they are not subject to mechanical wear. But the advantages with mechanical wear are offset by the disadvantages with switching distance, the immunity to interference and the materials to be used.
In an effort to circumvent this drawback, manufacturers have developed application-specific sensors, which for example, are particularly resistant to a wide range of temperatures or with are suitable for use in welding environments, or which feature high switching distances. Accordingly, the large range of inductive sensors and special types available on the market becomes more and more difficult to oversee. It is thus understandable that the users demand a standard sensor which can be used almost universally in different applications.
The same switching distance is mandatory
Classical ferrite core sensors only achieve their high switching distances with St37 (structural steel), as the dampening of the oscillator amplitude is the decisive factor. This dampening is however dependent on the alignment of the magnetic forces in the individual metals. In order to counteract these limitations, Factor 1 sensors have been developed and feature the same switching distance with all metals – regardless of it being the detection of iron, stainless steel, copper, aluminium or brass. The reduction factor is always 1 with these sensors...
The Author:
Silke Kenzer
is Product Specialist for Position and Proximity Sensors
at Hans Turck GmbH & Co. KG, Mülheim/Ruhr
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