Pressure transmitter
First Claim
1. Pressure transmitter for a pressure gauge, with a base body (2), with a separating membrane (6) disposed on a pressure-sensitive side (5) of the pressure transmitter (1) and subjectable externally to a pressure to be measured, with a communicating chamber (8, 9) inside the base body (2), said chamber accepting a pressure-transmitting medium and being sealed on the pressure-sensitive side (5) by the separating membrane (6), characterized in that the coefficients of thermal expansion of the separating membrane (6) and of the base body (2) and the coefficient of thermal expansion of the pressure-transmitting medium are established such that a temperature-induced volume change in the communicating chamber (8) is the same or at least approximately the same as a temperature-induced volume change in the pressure-transmitting medium.
1 Assignment
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Accused Products
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.
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Citations
8 Claims
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1. Pressure transmitter for a pressure gauge,
with a base body (2), with a separating membrane (6) disposed on a pressure-sensitive side (5) of the pressure transmitter (1) and subjectable externally to a pressure to be measured, with a communicating chamber (8, 9) inside the base body (2), said chamber accepting a pressure-transmitting medium and being sealed on the pressure-sensitive side (5) by the separating membrane (6), characterized in that the coefficients of thermal expansion of the separating membrane (6) and of the base body (2) and the coefficient of thermal expansion of the pressure-transmitting medium are established such that a temperature-induced volume change in the communicating chamber (8) is the same or at least approximately the same as a temperature-induced volume change in the pressure-transmitting medium.
Specification