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A sensor is also referred to as a transmitter or pick-up and qualitatively or quantitatively (as values) records specific (physical or chemical) properties of its environment as a technical component, whereby variables not suitable as signals are converted to signals designated for further processing.

Sensor classification based on energy usage

  • Active sensor: Active sensors do not require a power source. They provide a signal in the form of an electrical voltage, charge, or current such that only changes in the measurand can be determined.
  • Passive sensor: Passive sensors change an electrical parameter such as resistance, capacity, or inductivity and require a power source for this purpose. This also enables the measurement of static or quasi-static measurands and is the reason why these sensors are typically used.
  • Optical sensor: Optical sensors transform non-optical variables into optical signals, which are subsequently processed further by opto-electronic devices. 

Sensors (measuring elements) differ according to their measuring principle.

Measuring principles

Configured (selected) sensors

If the sensors are equipped with integrated measured value conditioning, they are referred to as sensor systems.



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