Abstract: A differential pressure sensor for determining the differential pressure between two pressures includes a converter chamber including a differential pressure measuring cell, and a measuring unit including a main body and a coplanar double-membrane system with two double membranes, each including a separating membrane and an overload membrane with a pressure chamber between the separating membrane and the overload membrane and an additional pressure chamber between the overload membrane and the main body.

Abstract: A two-stage, shaped charge projectile having a rear principal charge and a front secondary smaller charge with an initiator-fuse assembly for sequentially igniting the secondary and principal charges so that the secondary charge is first ignited, followed by ignition of the principal charge after a predetermined time delay. The secondary charge is maintained at a set distance in front of the principal charge which is shielded from rearwardly expanding combustion gases and rearwardly flying debris when the secondary charge is ignited, with these gases and debris being diverted away from the principal charge after the secondary charge has been detonated.