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Detector (Noun)

Any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner.

Nouns denoting man-made objects.

The smoke detector in the hallway began to beep loudly when it sensed the rising smoke from the kitchen.
A metal detector is a device that is used to locate metal objects, such as coins or jewelry, that are buried underground.
The motion detector on the front porch turned on the lights as soon as someone approached the door.
The heat detector in the attic alerted the fire department to the growing blaze before it spread to the rest of the house.
The burglar alarm system used a pressure detector to sense when someone was trying to break in through the window.