PRESSURE TRANSDUCER WITH FREQUENCY OUTPUT Russian patent published in 2001 - IPC

FIELD: information measuring equipment of pressure of liquid media and gaseous atmosphere. SUBSTANCE: the transducer has self-excitation system 14 and sensing element 10 in the form of a flat vibratory system accomplishing lateral vibrations and dividing the inner cavity of the sensing element into two working chambers, and is provided with a chamber compressed by the measured pressure, the compressed chamber and the inner cavity of the sensing element communicate with each other, are filled with inert gas and sealed. The chamber compressed by measured pressure may be formed by an elastic membrane and a base member, whose surface faces the membrane, repeats its shape, or may be made in the form of a membrane box formed by membranes one of which is folded up when the pressure exceeds the maximum measured. The pressure transducer may be provided with a thermo adjusting transducer. The transducer sensing element may be made in the form of two vibratory systems 10 and 12, one of which forms the pressure transducer, and the other - the thermo adjusting transducer. The transducer vibratory system may be made in the form of a rectangular plate fastened in the nodal points of the standing wave of natural flexural vibrations, the working chambers are made in the form of slots, whose cross-sectional dimension does not exceed the doubled thickness of the viscous friction layer. The transducer vibratory system may be made in the form of a membrane with a rigid center, and the working chambers may be made in the form of slots, whose cross-sectional dimension does not exceed the doubled thickness of the viscous friction layer. EFFECT: enhanced reliability, expanded range of pressure measurement, enhanced accuracy. 11 cl, 10 dwg