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Pressure transmitter

A pressure sensor and transmitter technology, applied in the measurement of fluid pressure, instruments, pressure difference measurement between multiple valves, etc., can solve problems such as deterioration of pressure transmission characteristics, and achieve long-term maintenance of pressure transmission characteristics and pressure stability. Effect

Inactive Publication Date: 2015-04-29
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if the generated gas exceeds the solubility of the filling liquid, it will be bubbled, so the pressure transmission characteristics in the pressure transmitter will deteriorate

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach 》

[0030] (Pressure transmitter for differential pressure measurement)

[0031] figure 1 It is a figure which shows the structure of the pressure transmitter of 1st Embodiment. The pressure transmitter 1 shown in this figure is used to measure the pressure difference between two points (high pressure side and low pressure side) by using the process fluid in various equipment as the measurement fluid for pressure measurement.

[0032]

[0033] The pressure transmitter 1 includes: a pressure guide path 11 provided corresponding to the measurement fluid Fh on the high pressure side; and a pressure guide passage 11' provided corresponding to the measurement fluid F1 on the low pressure side of the measurement fluid Fh. Filling liquid L is filled inside the pair of pressure guide passages 11, 11'. One opening of each pressure guide passage 11, 11' is closed by a pressure-receiving diaphragm 13, 13', respectively. In addition, this pressure transmitter 1 includes: one pressure sen...

no. 2 Embodiment approach 》

[0086] (A pressure transmitter for differential pressure measurement with a hydrogen permeation preventing layer on the diaphragm)

[0087] Figure 7 It is a figure which shows the structure of the pressure transmitter of 2nd Embodiment. The pressure transmitter 2 shown in this figure is used for pressure measurement using a process fluid as a measurement fluid in various equipment, and measures the pressure difference between two points (high pressure side and low pressure side).

[0088]

[0089] The pressure transmitter 2 is used with figure 1 The pressure transmitter of the first embodiment described is different in that the hydrogen permeation prevention layer 21 is provided on the pressure-receiving diaphragms 13, 13', and the other structures are the same. Therefore, the same reference numerals are assigned to the same configurations as those of the pressure transmitter of the first embodiment, and overlapping descriptions will be omitted.

[0090] [hydrogen permea...

no. 3 Embodiment approach 》

[0104] (Pressure transmitter for absolute pressure measurement)

[0105] Figure 9 It is a figure which shows the structure of the pressure transmitter of 3rd Embodiment. The pressure transmitter 3 shown in the figure is used for pressure measurement using the process fluid in various devices as a measurement fluid, and is a pressure transmitter for measuring the pressure of the measurement fluid F for absolute pressure measurement.

[0106]

[0107] The pressure transmitter 3 is used with figure 1 The pressure transmission device of the first embodiment described is different in that only one pressure receiving diaphragm 13 and one pressure guide path 11 are provided for one pressure sensor 15 . In addition, the other opening of the pressure guiding path 11 is disposed only on one side of the pressure sensor 15, and the pressure of the measurement fluid F received by the pressure receiving diaphragm 13 provided at one opening of the pressure guiding path 11 is detected. ...

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PUM

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Abstract

A pressure transmitter (1) including tube-like pressure introducing pipes (11, 11'), a sealed-in liquid (L), the inside of the pressure introducing pipes (11, 11') being filled with the sealed-in liquid (L), pressure receiving diaphragms (13, 13') for receiving the pressures of measurement fluids (Fh, Fl), the pressure receiving diaphragms (13, 13') being set up in a state where one-side apertures in the pressure introducing pipes (11, 11') are blocked by the pressure receiving diaphragms (13, 13'), and a pressure sensor (15) that is set up in common to the other-side apertures in the pressure introducing pipes (11, 11') in a state where the pressure sensor (15) is exposed to the sealed-in liquid (L), wherein the sealed-in liquid (L) is silicon oil containing phenyl groups, the pressure transmitter (1) further including a hydrogen-storage material that is set up inside the pressure introducing pipes (11, 11').

Description

technical field [0001] The present invention relates to a pressure transmitter, in particular to a pressure transmitter preferably suitable for use in a radiation environment, a high temperature environment. Background technique [0002] The pressure transmitter transmits the pressure of the fluid under the pressure of the diaphragm to the pressure sensor by using the filling liquid filled in the pressure guiding path, and transmits the electrical signal detected by the pressure sensor to the outside. There are pressure transmitters for measuring absolute pressure and pressure transmitters for measuring differential pressure. pressure transmitter. [0003] These pressure transmitters are used for various measurements of process fluids in petroleum refining facilities including nuclear energy facilities, chemical facilities, etc., and accuracy of ±1%, for example, is required from the viewpoint of ensuring the safety of the facilities and the quality of the products. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L7/08
CPCG01L13/026G01L19/0645G01L7/08G01L7/088
Inventor 有田节男桑名谅马场淳史伏见笃新间大辅花见英树原勋伊藤崇
Owner HITACHI LTD