Pressure measuring apparatus
AssigneeFuji Electric Co., Ltd.
InventorsMitsuru Tamai, Hironobu Yao, Masao Saitoh
Life of this patent
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Abstract
A pressure measuring apparatus comprising a seal diaphragm that separates a fluid to be measured from a pressure transmitting medium that transmits a pressure variation of the fluid to be measured to a pressure detecting section. In such an apparatus, a non-electrically conductive film is coated on a surface of the seal diaphragm which is on the side of the fluid to be measured. As a result of the above construction, the pressure can be measured accurately over a long period of time while preventing hydrogen from passing through the seal diaphragm surely and protecting the seal diaphragm.
Claims7
An apparatus for measuring pressure in a first fluid, comprising:
- a second fluid contained in the apparatus for transmitting a pressure variation of the first fluid to a pressure detecting section;
- a seal diaphragm for separating the first fluid from the second fluid;
- and
- a first non-electrically conductive film cleaved to a surface of said seal diaphragm, said first non-electrically conductive film and said surface being on the side of said first fluid.
An apparatus for measuring pressure in a first fluid, comprising:
- a second fluid contained in the apparatus for transmitting a pressure variation of the first fluid to a pressure detecting section;
- a seal diaphragm for separating the first fluid from the second fluid;
- and
- a first non-electrically conductive film connected to a surface of said seal diaphragm, said first non-electrically conductive film and said surface being on the side of said first fluid, wherein a plurality of non-electrically conductive films are coated on said seal diaphragm surface on the side of said first fluid.
An apparatus for measuring pressure in a first fluid, comprising:
- a second fluid contained in the apparatus for transmitting a pressure variation of the first fluid to a pressure detecting section;
- a seal diaphragm for separating the first fluid from the second fluid;
- a first non-electrically conductive film connected to a surface of said seal, diaphragm, said first non-electrically conductive film and said surface being on the side of said first fluid;
- and
- a second non-electrically conductive film positioned between said first non-electrically conductive film and said seal diaphragm surface so that said first non-electrically conductive film comes in contact with said first fluid, said first non-electrically conductive film being made of a material that resists corrosion caused by said first fluid and said second non-electrically conductive film being made of a material having good contact property to both said first non-electrically conductive film and said seal diaphragm.
An apparatus for measuring pressure in a first fluid, comprising:
- a second fluid contained in the apparatus for transmitting a pressure variation of the first fluid to a pressure detecting section;
- a seal diaphragm for separating the first fluid from the second fluid;
- a first non-electrically conductive film connected to a surface of said seal diaphragm, said first non-electrically conductive film and said surface being on the side of said first fluid;
- and
- a hydrogen diffusion blocking film, positioned between said first non-electrically conductive film and said seal diaphragm surface so that said non-electrically conductive film comes in contact with said first fluid, said hydrogen diffusion blocking film being made of a metallic material into which hydrogen does not easily diffuse.
An apparatus for measuring pressure in a first fluid, comprising:
- a second fluid contained in the apparatus for transmitting a pressure variation of the first fluid to a pressure detecting section;
- a seal diaphragm for separating the first fluid from the second fluid;
- and
- a first non-electrically conductive film connected to a surface of said seal diaphragm, said first non-electrically conductive film and said surface being on the side of said first fluid, wherein said first non-electrically conductive film includes ceramics.
Dependencies are inferred from the claim text.