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Sensors are technical components, the physical or chemical properties such as: can temperature, light, humidity, pressure and the material nature of its environment collect qualitative or quantitative. These variables are measured by physical or chemical effects, and converted into electrical signals. For the measurement technique is used in DIN 1319-1, the term transducer measurements.

Sensors can be classified according to size and production technology as well as on the use and purpose. A distinction is sensors according to their mode of action during the forming of the sizes in passive and active sensors.

In the art sensors in automated processes play an important role as signal transducer. Be covered by them values ​​or states, usually electrically-amplified electronically, in the corresponding control processes, which triggers the appropriate action. In recent years, the subsequent signal processing is performed increasingly in the sensor. Such sensors include a microprocessor or a micro-system and have intelligence, so they are also known as a smart sensor.

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