GB211880A - - Google Patents

Abstract

211,880. Cassan, J. H. F. Feb. 23, 1923, [Convention date]. Gas analysis.-The percentage of water vapour, or carbon dioxide &c. in a gaseous mixture is measured by drawing t h e mixture through a standard orifice at a known temperature a n d pressure and measuring the rate of flow. A tube 4 closed at its inner end contains coaxially a smaller tube 1 at the inner end of which is a diaphragm 2 with a small central orifice. The outer end of the tube 1 is connected by a flexible tube 3 to a tube 9 passing into a Mariotte's vessel 7. The vessel being filled with water &c. and the valve 15 at its lower end then opened, the time taken by the water to descend from the level 11 to the level 10 is measured and from this the composition of the mixture is deduced. The measurement of the time may be made automatic by providing pivoted floats within the vessel at the upper and lower levels, the floats being provided with arms controlling electric circuits.