What Is a Passive Infrared Sensor?

Passive sensors are also known as energy-controlled sensors and require an external power source. For example, resistance sensors, capacitance sensors, inductive sensors and other circuit parameter type sensors are all passive sensors. [1]

Passive sensor

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Passive sensors are also known as energy-controlled sensors and require an external power source. For example, resistance sensors, capacitance sensors, inductive sensors and other circuit parameter type sensors are all passive sensors. [1]
An inductive sensor that does not require an externally powered sensor and can obtain unlimited energy from the outside.

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