초록 ▼

This invention is an apparatus for making solutions of chemicals of specified molarity, normality, molality or weight percentage corrected, as necessary, for water of hydration in the solute. By means of an input-output device using a programmed instruction format, the desired chemical, the type of

This invention is an apparatus for making solutions of chemicals of specified molarity, normality, molality or weight percentage corrected, as necessary, for water of hydration in the solute. By means of an input-output device using a programmed instruction format, the desired chemical, the type of solution wanted, its concentration, and its volume are specified. An electronic balance with TARE capability repeatedly produces an output signal of the weight W of solute plus any solvent within a container in which the solution is to be mixed less the weight of the container. Apparatus are provided for calculating and storing the weight TW which is the total weight of the solute plus solvent which will result in a solution of the type and concentration of solution specified for the amount of solute placed on the balance. If the total volume of solution of the desired type and concentration of solution is specified, apparatus are provided for determining the amount of solute required. Means are provided for controlling the flow of solvent between a source and the container for causing the flow of solvent into the container when TW-W is greater than zero and to stop the flow of solvent into the container when TW-W=0. Apparatus are provided to prevent overfilling the container.

대표청구항 ▼

A process for mixing solutions of specified molarity and approximate volume comprising: (a) specifying a molarity M of a solution to be mixed in a container by the addition of a solvent to a solute within the container; (b) specifying an approximate volume V of solution of the specified molarity M;

A process for mixing solutions of specified molarity and approximate volume comprising: (a) specifying a molarity M of a solution to be mixed in a container by the addition of a solvent to a solute within the container; (b) specifying an approximate volume V of solution of the specified molarity M; (c) calculating a weight of solvent plus solute TW for mixing the solution of specified approximate volume V; (d) calculating a weight of solute WS required for mixing the solution with the weight TW of solute plus solvent; (e) adding a weight of solute to the container which is less than, equal to or greater than WS; (f) calculating a weight of solvent plus solute TW for mixing the solution of specified molarity M from the actual weight of solute WS which has been added to the container; and (g) adding solvent to the container until the weight of solvent plus solute is equal to the calculated weight TW for mixing the solution of specified molarity M from the actual weight of solute WS which has been added to the container. An apparatus for making a solution of specified molarity from a solute placed in a container by the addition of solvent to the container comprising: (a) means for repeatedly measuring the weight W of the solute plus any solvent within a container: (b) means for specifying the molarity M of the solution to be mixed from a solute within the container by the addition of solvent to the container; (c) fluid conducting means disposed between a source of solvent and the container for transferring solvent from the source to the container for mixing the solutions of the specified molarity M within the container; (d) means for calculating TW wherein TW is the combined weight of solvent plus solute necessary to make the solution; (e) means for calculating TW-W; and (f) means responsive to the means for calculating TW-W for controlling the flow of solvent between the source and the container, the means for controlling causing the flow of solvent into the container to occur when TW>W and to stop when TW=W.