Digital pressure-measuring device

G - Physics – 01 – L

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G01L 9/00 (2006.01) G01L 11/00 (2006.01) G01L 13/00 (2006.01) G01L 19/08 (2006.01)

Patent

CA 1108433

A DIGITAL PRESSURE-MEASURING DEVICE Abstract of the Disclosure A pressure-measuring device which operates in digital representation comprises : -a first chamber subjected to the pressure to be measured; -a second chamber subjected to a reference pressure and connected to the first chamber through at least one opening fitted with a valve ; -means for measuring the difference both in magnitude and in sign between the pressures prevailing respectively within the first and second chambers, said means being intended to deliver an electrical signal which is a function of said difference ; - a circuit for detecting the instants at which said difference attains a predetermined increment + .DELTA.P or a predetermined decrement - .DELTA.P and for detecting instants at which said difference becomes zero ; - means connected to said circuit for initiating the opening of the valve or valves when the difference attains the values + .DELTA.P and of initiating closure of the valve or valves when said difference becomes zero ; - bidirectional counting means connected to said circuit in order to account for the number of increments + .DELTA.P obtained and reduced by the number of decrements - .DELTA.P obtained. -1-

330972

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