| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure measuring apparatus with improved resistance to corrosion and temperature characteristics. SOLUTION: The pressure measuring apparatus provided with a pressure receiving block formed of a metallic material with a protruded part with its top face facing a fluid to be measured is provided with a flat diaphragm part formed of a synthetic resin material covering the top face of the protruded part and constituting the top face and a pressure receiving chamber, a diaphragm supporting part formed of a tubular synthetic resin material with one edge connected to the circumferential edge part of the flat diaphragm part and in contact with the side circumferential surface of the protruded part, a through hole provided for the protruded part with one end communicating with the pressure receiving chamber and the other end communicating with a pressure sensor, and a sealed liquid filled in the through hole and the pressure receiving chamber. The materials of the flat diaphragm supporting part and the protruded part are selected so as to absorb the amount of volume change due to changes in the peripheral temperature of the sealed liquid by the amount of volume change due to the difference of the coefficient of thermal expansion between the flat diaphragm supporting part and the protruded part.
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