| 摘要 |
978,218. Determining relative quantities of fluid mixture constituents. COMMISSARIAT A L'ENERGIE ATOMIQUE. April 17, 1962 [April 24, 1961], No. 14822/62. Heading G1N. In an arrangement for continuously measuring the difference in the conductivities of two liquids respectively passing through two conductivity cells 1 and 3, a signal representative of the difference is developed in a first bridge including the cells and the primary windings 12, 15 of a transformer 13, and is measured in a second bridge circuit, including the secondary winding 28 of transformer 13, wherein it is compared with an adjustable voltage applied to a transformer 34. Three ranges of sensitivity are provided for in both bridges by switchable resistors 24, 30, 36, 43 and resistors 6, 9 provide for the elimination of unbalance due to cell differences. A calibrating procedure is described. The apparatus is described with reference to a system for determining the oxygen content of a water oxygen solution in which the solution is passed through column 2 containing a reagent such as thallium which combines with the oxygen to yield a soluble and ionised hydroxide after passing through the first cell and before being admitted to the second. The temperatures in the two cells should be maintained the same or temperature compensation such as provided by the inclusion of a transistor in the circuitry may be included. |
