Patent ID: 7779697
Filing Date: 2010-08-24
Classification: G01F,G01L

Abstract:
1. A pressure sensing device adapted to corrosive or explosive atmospheres and particularly intended to equip a vapor or liquid flowmeter of static fluidic oscillator type, this device comprising: a pressure orifice linked to a measuring circuit so as to send audible signals representative of the variations in the pressure to be measured to a measuring membrane fixed into a measuring cavity and deforming under the effect of the audible signals applied thereto; a deformation sensor sensitive to these mechanical deformations and converting them into electric signals; and electronic processing units for electronically processing the electric signals associated with this deformation sensor, characterized in that the measuring circuit comprises: a very thin corrosion-proof protective membrane which is slightly elastically deformable, made of a very resistant material and blocked in a protective cavity dimensioned in such a way as to limit its displacement; and at least one explosion-proof protective tube mounted downstream from the protective membrane in the direction in which the electric signals propagate, designed so as to avoid any flame propagation and used as a hydraulic resistance; and