公开(公告)号：US4841777A

公开(公告)日：1989-06-27

申请号：US171599

申请日：1988-03-22

申请人： George E. Hershey ,  Charles E. Lane, III ,  Douglas W. Wilda

发明人： George E. Hershey ,  Charles E. Lane, III ,  Douglas W. Wilda

IPC分类号： G01L13/00 ,  G01L9/00 ,  G01L13/02

CPC分类号： G01L19/148 ,  G01L13/025 ,  G01L19/0038 ,  G01L19/0645 ,  G01L19/142

摘要： A pressure transmitter assembly includes a laminated ceramic structure for providing fluid passages as well as a support for a pressure sensor, electronic circuitry, fluid barrier diaphragms and input process fluid connections. The laminated structure is comprised of a plurality of co-fired ceramic layers having the fluid passages molded therein to enable fill fluids within the assembly to apply input pressures as a differential pressure across the pressure sensor. In one embodiment of the invention, three ceramic layers are used while a second embodiment uses four layers with an overload diaphragm captured between two of the layers. The laminated ceramic structure can be extended in either embodiment to include an outer ceramic circuit board which is bonded with a fluid-tight interface with an adjacent one of the other ceramic layers. Electronic components are mounted on the circuit board, either before or after bonding, which also provides a capability for further fluid passages extending between the circuit board and an adjacent ceramic layer.

公开(公告)号：US5811690A

公开(公告)日：1998-09-22

申请号：US822198

申请日：1997-03-20

申请人： George E. Hershey

发明人： George E. Hershey

IPC分类号： G01L19/04 ,  G01L27/00 ,  G01P1/00 ,  G01P21/02 ,  G01F1/38 ,  G01F23/14

CPC分类号： G01F23/18 ,  G01L9/025 ,  G01P1/006 ,  G01P21/025

摘要： A remote seal differential pressure transmitter, when installed with its remote seal separated by a vertical distance, has an accurate output signal which is compensated for all temperature effects, including compensation of the sensors' temperature characteristics and compensation of the remote seals' temperature characteristics. Compensation for the remote seals' temperature characteristics must include compensation for the expansion and contraction of the translation fluid used in the remote seals and compensation for changes in density of the translation fluid. The changes in density and the installed height of remote seals specifically create a height/temperature error which must be compensated for when the temperature changes.

摘要翻译： 远程密封差压变送器安装时，其远程密封隔开垂直距离，具有精确的输出信号，可补偿所有温度影响，包括传感器温度特性的补偿和远程密封件温度特性的补偿。 遥控密封温度特性的补偿必须包括补偿远程密封中使用的平移流体的膨胀和收缩，并补偿翻译液密度的变化。 密封的变化和远程密封的安装高度会特别造成高度/温度误差，必须在温度变化时进行补偿。

公开(公告)号：US4329877A

公开(公告)日：1982-05-18

申请号：US165116

申请日：1980-07-01

申请人： George E. Hershey

发明人： George E. Hershey

IPC分类号： G01L13/02 ,  G01L19/06 ,  G01L7/08

CPC分类号： G01L19/0618 ,  G01L13/025 ,  G01L19/0645

摘要： An adjustable overload mechanism for a differential fluid pressure transmitter includes a first and a second overload control diaphragm and an adjustable spring pressure means for applying an adjustable preload pressure to the control diaphragms. The spring pressure means for each diaphragm includes a spring such as a Belleville washer spring located between a diaphragm back-up plate in contact with a side of the control diaphragm and a wedge shaped support for the Belleville washer spring. A wedge shaped drive means is arranged to be selectively movable with respect to the wedge shaped spring support while maintaining the sloping wedge surfaces in contact. An adjustable drive screw is connected to the drive wedge to provide a means for changing the relative position of the support wedge and drive wedge. The relative motion between the two wedge shaped elements displaces the support wedge transversely to the Belleville washer to change the height of the Belleville washer which affects the preload or spring pressure against the control diaphragm. Each control diaphragm is used to control the valving of a fill fluid in contact with a respective barrier diaphragm subjected to an input fluid pressure. The fill fluid is pressurized by the movement of the barrier diaphragm and transmits the input pressure to a pressure sensor. An excessive or overload input pressure overcomes the preload or spring pressure biasing the control diaphragm to divert the fill fluid displaced by the barrier diaphragm to protect the sensor from the overload pressure.

摘要翻译： 用于差动流体压力变送器的可调节的过载机构包括第一和第二过载控制隔膜和用于向控制隔膜施加可调节的预加载压力的可调弹簧压力装置。 用于每个隔膜的弹簧压力装置包括弹簧，例如位于与控制膜片侧面接触的隔膜支撑板之间的Belleville垫圈弹簧和用于Belleville垫圈弹簧的楔形支撑件。 楔形驱动装置布置成可相对于楔形弹簧支撑件选择性地移动，同时保持倾斜的楔形表面接触。 可调驱动螺钉连接到驱动楔，以提供用于改变支撑楔和驱动楔的相对位置的装置。 两个楔形元件之间的相对运动使支撑楔横向移动到Belleville垫圈，以改变Belleville垫圈的高度，这对冲击控制膜片的预压或弹簧压力有影响。 每个控制膜片用于控制与经受输入流体压力的相应屏障隔膜接触的填充流体的阀。 填充液体通过阻挡隔膜的移动被加压，并将输入压力传递给压力传感器。 过载或过载输入压力克服了预压力或弹簧压力，偏压控制膜片以转移由阻挡膜片移位的填充液体，以保护传感器免受过载压力的影响。