Hitachi, Ltd.

Yosimi Yamamoto

Takeo Nagata

Hiroyasu Uchida

Akira Nagasu

Yutaka Sakurai

Keiichi Satou

A pressure transducer is arranged to mount a semiconductor pressure sensor in a housing such that the pressure of a high-pressure fluid is applied to one side of the semiconductor pressure sensor through a high pressure seal diaphragm and a sealed liquid in the high pressure side, while the pressure of a low-pressure fluid is applied to the other side of the sensor through a low-pressure seal diaphragm and a sealed liquid in the low pressure side, and a protecting member is provided closer to the low-pressure seal diaphragm.

Pressure transducer

A filled-in-fluid and diaphragm type intermediate device for transmitting pressure and for use with a pressure, liquid level or flow rate transmitter is disclosed, which enables the measurement of the pressure, liquid level or flow rate at a high temperature by using a conventional transmitter. This device includes a fluid-contacting flange having mounted thereon a pressure receiving element and coupled to a flange provided on the side of a fluid to be measured. A sealing flange having mounted thereon a diaphragm is provided on the side of a meter proper. A pressure transmitting pipe is coupled to the fluid-contacting flange and to the sealing flange, and contains therein a pressure-transmitting fluid which is adapted for use at a high temperature or as anti-radiant-ray fluid.

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Katsuta, Japan

Yosimi Yamamoto