Electrical contact pressure gauges contain an elastic sensitive element (such as a Bourdon tube or diaphragm box) inside their dial. When the measured medium (liquid or gas) applies pressure to this sensitive element, it elastically deforms. This deformation is transmitted through a mechanical linkage (like gears or levers) to rotate a pointer, displaying the current pressure value on the dial. For instance, when pressure rises, the Bourdon tube expands outward, driving the pointer clockwise; conversely, it moves in the opposite direction as pressure decreases.
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