Hitachi, Ltd.

Daisuke Shinma

Ryo Kuwana

Atsushi Fushimi

Isao Hara

Hideki Hanami

Takashi Ito

Setsuo Arita

Atsushi Baba

Naoyuki Yamada

Hiroyuki Akiyama

Yuji Ichinose

Shigenobu Yanai

Provided is a pressure transmitter device including: a pressure receiving diaphragm in contact with a measuring fluid; a fill fluid, in contact with an opposite side of the pressure receiving diaphragm to the other side in contact with the measuring fluid, for transferring a pressure received by the pressure receiving diaphragm from the measuring fluid to a sensor disposed at a position apart from the pressure receiving diaphragm; a hydraulic path filled with the fill fluid and connecting the pressure receiving diaphragm and the sensor; and an output circuit for measuring and outputting an absolute pressure of the measuring fluid or a differential pressure between measuring fluids based on the pressure received by the sensor, where a hydrocarbon absorbing material for absorbing hydrocarbon and a hydrogen occlusion material for occluding hydrogen are provided inside the hydraulic path.

Pressure transmitter device

In a pressure and pressure difference transmitter that seals a sealing liquid for transmitting the pressure inside a pressure leading passage, the pressure and pressure difference transmitter forming a space between a diaphragm and a main body side wall surface, including the pressure leading passage connected to the main body side wall surface, and transmitting the pressure received by the diaphragm to a sensor through the sealing liquid sealed in the space and the pressure leading passage, a hydrogen occluding material for occluding hydrogen atoms of the sealing liquid is disposed at least in the sealing liquid, the main body side wall surface, or a part of a portion from the main body side wall surface to the sensor, with the hydrogen occluding material being formed with an uneven shape on the surface or being attached with a granular hydrogen occluding material.

Transmission device

Hydrogen which has entered into a pressure/differential pressure transmitter from external or internally generated hydrogen and hydrocarbons are converted to air bubbles within pressure guide paths. As a result, the indicated value drifts and an accurate numerical value is not output. A pressure/differential pressure transmitter includes a space formed between a diaphragm and a main body side wall face, pressure guide paths connected to the main body side wall face, a sealed liquid sealed in the space and the pressure guide paths to transmit a pressure received by the diaphragm to a sensor, and a hydrogen absorption material provided at least in the sealed liquid, on the main body side wall face, or in a part of a path between the main body side wall face and the sensor to absorb hydrogen atoms in the sealed liquid.

Pressure transmitter and transmission method

A communication apparatus installed in the trains and that in a complex station building, a station or a maintenance factory communication through feeders, trolley wires or third rails can communicate each other. The present invention can realize a low cost vehicle-facility intra communication system that provides various information services available in the train.

Communication apparatus, communication method and installation method of railway vehicle-facility intra communication system

Growing community of inventors

Tokyo, Japan

Daisuke Shinma