Pressure gauge with hydraulic pressure transmission
A transmitter and pressure technology, applied in the direction of measuring fluid pressure, fluid pressure measurement by changing ohmic resistance, instruments, etc., can solve problems such as not being able to enjoy high temperature
Inactive Publication Date: 2008-09-10
EHNDRESS KHAUZER GMBKH KO KG
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Problems solved by technology
Electronic components and semiconductor measurement units, for example, do not enjoy the benefits of high temperatures
Method used
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[0023] Such as figure 1 with 2 As shown, the pressure transmitter of the present invention includes a sensor module 1 and a transmission module 2 . The sensor module 1 comprises a sensor body 11 which is cylindrically or otherwise axially symmetric at least in sections. Inside the sensor body 11 is a measuring cell cavity 15 which is connected to the first end face of the sensor body 11 via the measuring cell channel 12 . The first end face faces the transmission module 2 . It is additionally bounded by an annular fitting wall 17 which extends axially from the first end face. The mounting wall 17 has a first mounting end face 18 which is planar in the presently preferred embodiment. The first assembly end surface 18 is press-tightly connected with the matched second assembly surface. This is explained in detail below in connection with the structural description of the transmission module.
[0024] In the currently preferred embodiment, the transfer module comprises a pr...
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The invention relates to a pressure gauge for high-temperature applications, comprising a sensor module (1) with a sensor body (11) that has a measuring cell chamber (15) inside of which a pressure measuring cell (13) is placed. The pressure measuring cell (13) can be subjected to the action of a pressure via a first hydraulic path filled with a transmission liquid. The pressure gauge also comprises a transmission module for transmitting a pressure to the first hydraulic path. The transmission module (2) has a second hydraulic path, which is filled with a transmission liquid and which extends from a process diaphragm (24), through a transmission body (22) and to a transmission diaphragm (25).; The transmission diaphragm (25) is attached to the transmission body (22) in a pressure-tight manner, and the sensor body (11) is joined to the transmission body in a pressure-tight manner whereby the transmission diaphragm (25) communicates with the first hydraulic path so that the pressure of the second hydraulic path can be transmitted via the transmission diaphragm to the first hydraulic path.
Description
technical field [0001] The invention relates to a pressure transmitter with hydraulic pressure transmission, especially for high temperatures. Background technique [0002] Pressure transmitters with hydraulic pressure transmission generally include a hydraulic path extending between a process diaphragm, which is exposed to the process medium whose pressure is to be determined, and a pressure measurement cell. In this case, problems arise when high temperatures of the process medium occur at lower process pressures, eg temperatures above 200° C. at pressures below 100 mbar. In these cases, the transport liquid in the hydraulic path may evaporate or leak air. In the best case this can irreversibly follow the vapor pressure curve for the particular transported liquid, however, in this case plastic deformation of the process diaphragm can occur which can lead to erroneous measurement results. Typically, the transfer liquid does not follow the vapor pressure curve for the pure...
Claims
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IPC IPC(8): G01L19/00G01L19/06G01L9/06
CPCG01L19/0681G01L19/0645G01L19/0092G01L19/0663
Inventor 托马斯·尤林于尔根·朗格奥拉夫·特克斯托尔雷蒙德·贝谢卡尔-海因茨·班霍尔策
Owner EHNDRESS KHAUZER GMBKH KO KG