EXCESS PRESSURE SENSOR Russian patent published in 2010 - IPC G01L19/12 

FIELD: physics.

SUBSTANCE: excess pressure sensor has a housing in which there are two linked cavities lying one above the other with separation and compensation membrane, a strain gauge electrically connected to an electronic unit through pressure seals. One of the cavities is linked to the detecting element of the strain gauge and is filled with low-compressible dielectric liquid. Also between the cavities there are profiled support surfaces for the membranes, bent towards each other, and a through-opening which is covered by on the side of the lower cavity by the compensation membrane which is pressed to the support surface by given excess pressure inside the volume under it. The separation membrane in the upper cavity, which receives the converted pressure, lies in a neutral position.

EFFECT: protection of the row of detecting elements of the sensor with different conversion ranges from critical pressure overload without replacing the fitted elastic members.

1 dwg