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

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

Active Publication Date: 2012-08-29
TOKHEIM HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0083] figure 1 The housing I of the oscillator is shown schematically, in which housing I the fluid to be measured flows.

[0084] refer to figure 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 casing 1 and are respectively connected to the measuring circuit 4, 4' are connected to send the audio signal representing the change of the pressure to be measured to both sides of the membrane 1.

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

[0086] The circuit 4 is shown with a thick line and the other circuit 4' with 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 ′ comprises the same elements X ′ ...

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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 present invention relates to a pressure sensing device for corrosive or explosive gases. [0002] More specifically, such a device may be fitted on a fluid oscillator type gas or liquid flow meter, but may also be used for other types of pressure sensors, including for example acoustic pressure sensors in microphones. Background technique [0003] A static fluid oscillator of the type within the scope of the invention is described by way of example in document FR 2746147A. [0004] In such flowmeters, the fluid to be measured flows through an enclosure, creating turbulent flow in the enclosure and generating periodic pressure oscillations, the frequency of which is proportional to the fluid flow rate. [0005] These pressure oscillations are basically similar to phenomena that occur in musical instruments, especially wind instruments. [0006] In fact, in such instruments, the player generates audio signals representing changes in pressure and fl...

Claims

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Application Information

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Patent Type & Authority Patents(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