Sensing Element

Sensing pressure usually begins with converting the force exerted by the pressure media – gas or liquid - into a physical displacement. This can be used to move a pointer relative to a calibrated scale, or to cause an electrically measurable response such as resistance or capacitance change proportional to the pressure.

Sensing Element is that part of a pressure measuring instrument that responds directly to changes in input pressure.

The pressure sensing diaphragm, capsule, Bourdon tube, and expanding bellows are proven mechanisms for converting pressure to displacement. All except diaphragms provide a fairly 
large displacement that is useful in mechanical gauges and for electrical sensors that require a significant movement.