Differential pressure transducer

A differential pressure transducer for measuring a differential between two pressures, said transducer comprising:

• a closed measuring chamber formed by at least two deformable measuring membranes arranged to be acted upon by said two pressures, respectively, said measuring chamber containing a fluid medium, said measuring membranes being of identical size and shape and arranged as symmetrical mirror images of one another,
• a first deformable transmission membrane exposable to one of said pressures,
• a first pressure transmission chamber defined by said first transmission membrane and one of said measuring membranes, said first transmission chamber containing a fluid medium,
• a second deformable transmission membrane exposed to the other of said pressures,
• a second pressure transmission chamber defined by said second transmission membrane and the other of said measuring membranes, said first and second pressure transmission chambers having the same volume and arranged as symmetrical mirror images of one another,
• first and second fixed surfaces located opposite said first and second measuring membranes, respectively, for limiting the extent to which said measuring membranes can be deformed,
• third and fourth fixed surfaces located opposite said first and second transmission membranes, respectively, for limiting the extent to which said transmission membranes can be deformed,
• the volume of said measuring chamber being less than the volume of either of said pressure transmission chambers,
• measuring means disposed in said second pressure transmission chamber and operably connected to both of said measuring membranes to be activated thereby in response to a pressure differential, and
• means responsive to the activation of said measuring means for determining said pressure differential.