DIFFERENTIAL PRESSURE/PRESSURE TRANSMITTER

Japanese Patent JP3158913

B2

PURPOSE: To enable the preventing of the destruction of a sensor by providing a pressure receiving chamber with a deformation member for changing the volume of the inside of the pressure receiving chamber by a differential power or a pressure to suppress a rise in pressure within the pressure receiving chamber.
CONSTITUTION: A spherical recess part 36 is formed at the central part of a recess part 35 communicating with a pressure introduction port 32 and a ball body 37 is housed therein functioning as deformation member that is made of a material at a large volumetric compression rate such as teflon or rubber and is deformable by a pressure exceeding a specified value. A measured pressure applied into a lead pipe is transmitted to the recess part 35 through the introduction port 32 and applied to a sensor 21 through a liquid sealed into a diaphragm 25. At this point, even when the ball body 37 is deformed, the supply of the pressure from the lead pipe prevents measuring errors. On the other hand, when a temperature rise occurs in a closed space with the closing of a valve in the course of the lead pipe, a fluid inside expands to raise the pressure. But the volume of the ball body 37 reduces and suppresses a pressure rise within the pressure receiving chamber by absorbing the volume increased thereby allowing the preventing of an excessive pressure from being applied to the sensor 21.

Hideki Kuwayama
Norio Nakamura

JP32250494A

April 23, 2001

December 26, 1994

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Yokogawa Electric Corporation

G01L13/06; G01L13/00; G01L19/06; (IPC1-7): G01L13/00; G01L19/06

JP50137777A
JP58127139A
JP4350530A
JP5142078A
JP592673U

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