Barometer gas pressure measuring apparatus
OwnerRudiger Gunttnerinventor
Life of this patent
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Abstract
The invention relates to a gas pressure measuring apparatus having a gas-filled tank whose tank gas pressure acts from one side via an aperture in the tank wall on a movable part, more particularly a drop or column of liquid in a capillary, tube or the like, or a diaphragm closing the tank aperture or an aperture in an adjoining chamber having an indicating device, while the other side of the movable part or diaphragm can be acted upon by the gas to be measured with the lines of the gas tank provided with members having different rates of expansion upon temperature changes to provide compensation therefor.
Claims14
A gas pressure measuring apparatus comprising a tank filled with a pre-set quantity of a gaseous sensory medium, the volume of which is utilized for the measurement of a gas pressure, said tank having at least one aperture formed in a wall thereof, movable indicating means having a first end portion and a second end portion, said first end portion being received by said aperture so that said movable indicating means cooperates with said gaseous sensory medium, and said second end portion open to and cooperating with the ambient gas outside of said tank, the pressure of which is to be measured, and said tank comprises a first portion having a low coefficient of thermal expansion, and a second portion having a high coefficient of thermal expansion, said first and second portions each forming at least a portion of one of the walls of said tank, whereby the volume of said tank filled with said pre-set quantity of gaseous sensory medium can be varied in correspondence to any change of ambient temperature of said sensory gaseous medium so as to keep the pressure thereof constant.
Dependencies are inferred from the claim text.