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Pressure sensing device adapted to corrosive or explosive atmospheres and with means to filter disturbance frequencies

A sensing device, explosive technology, applied in the direction of fluid pressure measurement using acoustic methods, measuring fluid pressure, and detecting the dynamic effect of fluid flow, etc., can solve problems such as expensive, large, and complex systems

Active Publication Date: 2009-07-29
TOKHEIM HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] However, such an installation makes it difficult to balance the two pressure measurements and mainly to obtain a stable zero point and a symmetrical signal
[0023] Furthermore, in the presence of explosive or chemically aggressive fluids, such systems become very complex and therefore expensive and bulky

Method used

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  • Pressure sensing device adapted to corrosive or explosive atmospheres and with means to filter disturbance frequencies
  • Pressure sensing device adapted to corrosive or explosive atmospheres and with means to filter disturbance frequencies

Examples

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Embodiment Construction

[0083] FIG. 1 schematically shows the housing I of the oscillator in which the fluid to be measured flows.

[0084] 1, the pressure sensing device mainly includes a measuring membrane 1 and two pressure holes 3, 3', wherein the measuring membrane 1 is fixed in the measuring cavity 2, and the two pressure holes 3, 3'are located inside the housing I and respectively It is connected with the measuring circuits 4 and 4'to send audio signals indicating the pressure change to be measured to both sides of the membrane 1.

[0085] The two measuring circuits 4, 4'are identical and are installed symmetrically on both sides of the measuring membrane 1.

[0086] The circuit 4 is represented by a thick line, and the other circuit 4'is represented by a thinner line.

[0087] For the purpose of simplification, only the circuit 4 is described in the following content of this specification.

[0088] The measuring circuit 4'includes the same element X'as the corresponding element X in the measuring...

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PUM

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Abstract

The invention discloses a pressure sensing device adapted to corrosive or explosive atmospheres, particularly intended to equip a flowmeter of fluidic oscillator type, comprising a pressure orifice (3) linked to a measuring circuit (4) so as to send audible signals to a measuring membrane (1) fixed into a measuring cavity (2), a deformation sensor (5) sensitive to the deformations of this membrane and capable of converting them into electric signals, and an electronic amplifier associated with this deformation sensor (5). The invention is characterized in that the measuring circuit (4) comprises corrosion and explosion-proof protection means (7, 8, 9) and filtering means (9, 10; 11, 12; 13, 2) for filtering the audible signals so as to enable the disturbance frequencies of these signals to be removed.

Description

Technical field [0001] The invention relates to a pressure sensing device for corrosive or explosive gas. [0002] More specifically, this device can be mounted on a fluidic oscillator type gas or liquid flow meter, but can also be used for other types of pressure sensors, including, for example, sound pressure sensors in microphones. Background technique [0003] The type of static fluid oscillator within the scope of the present invention is described by way of example in document FR 2746147A. [0004] In this kind of flowmeter, the fluid to be measured flows through the enclosure, generating turbulence in the enclosure and generating periodic pressure oscillations, the oscillation frequency of which is proportional to the fluid flow rate. [0005] These pressure oscillations are basically similar to those that occur in musical instruments, especially wind instruments. [0006] In fact, in such musical instruments, the player generates audio signals that represent changes in pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B5/00G01F1/34G01F1/38F15C1/22
CPCG01F1/3281G01L19/0609G01F1/3282A62C4/00F15B5/00F15C1/22G01F1/20G01F1/3227G01F1/383G01L11/04G01L23/08G01F1/3259G01F1/34
Inventor J-P·尼特克基
Owner TOKHEIM HLDG BV
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