Pressure transmitter
AssigneeVEGA Grieshaber KG
InventorsEwald Boehler, Jorn Jacob
Life of this patent
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Abstract
The invention relates to a pressure transmitter for an overload-proof pressure gauge, comprising a base body, a separating membrane disposed on a pressure-sensitive side of the pressure transmitter and subjectable to a pressure to be measured, a communicating chamber located inside said base body, which receives a pressure transmission medium, said chamber being closed on the pressure-sensitive side by the separating membrane, wherein the coefficient of thermal expansion of the pressure transmission medium is established in such a way that a temperature-induced change in the volume of the communicating chamber equals a temperature-induced change in the volume of the pressure transmission medium.
Claims10
Pressure transmitter for a pressure gauge, comprising:
- a base body,
- a separating membrane disposed on a pressure-sensitive side of the pressure transmitter and subjectable externally to a pressure to be measured,
- a communicating chamber inside the base body, said chamber accepting a pressure-transmitting medium and being sealed on the pressure-sensitive side by the separating membrane,
- characterized in that the coefficients of thermal expansion of the separating membrane and of the base body and the coefficient of thermal expansion of the pressure-transmitting medium are established such that a temperature-induced volume change in the communicating chamber is the same or at least approximately the same as a temperature-induced volume change in the pressure-transmitting medium.
A pressure transmitter for use in a pressure transducer, said pressure transmitter comprising:
- a base body having a peripheral wall;
- a separating membrane attached to the peripheral wall to form a chamber between said base body and said membrane;
- and
- a pressure transmitting medium contained within said chamber;
- wherein coefficients of thermal expansion of said separating membrane and said base body, and the coefficient of thermal expansion of said pressure transmitting medium are such that a temperature-induced volume change in said chamber is at least approximately the same as a temperature-induced volume change in said pressure transmitting medium.
A pressure transmitter, comprising:
- a base body having a peripheral surface;
- a membrane attached to the peripheral surface to form a chamber between said base body and said membrane;
- and
- a medium contained within said chamber;
- wherein coefficients of thermal expansion of said membrane, said base body, and said medium are such that a temperature-induced volume change in said chamber is at least approximately the same as a temperature-induced volume change in said medium.
Dependencies are inferred from the claim text.