Concisely expressed, a pressure sensor is an instrument which measures pressure, and as such is used for monitoring and regulating numerous everyday situations.
Altitude sensors are employed in aircraft, satellites, weather balloons, barometers, and a range of other applications.
As its name suggests, level or depth sensing may be used to quantify the level of a fluid, and is frequently used to calculate the depth of a submarine, diver, or such other submerged body, as also the content level of a water tank.
Further applications include flow sensing and leak testing, the latter of which is utilized to detect pressure decay occasioned by a system leak.
By virtue of pressure sensor miniaturization, these instruments are also becoming increasingly popular in the medical industry, where they are used for external applications and invasive procedures.
Despite the range of uses for which pressure sensors may be applied, they are not infallible, with periodic failure being attributed to, inter alia, extreme temperature, moisture ingress, sensor overload, and general wear and tear.