초록 ▼

An apparatus for making dilutions of a sample with a diluent to a predetermined dilution factor f by weight of the diluent is disclosed. A scale with TARE capability produces an output signal of the weight W of a sample within a container less the weight of the container. A dilution factor control i

An apparatus for making dilutions of a sample with a diluent to a predetermined dilution factor f by weight of the diluent is disclosed. A scale with TARE capability produces an output signal of the weight W of a sample within a container less the weight of the container. A dilution factor control is provided for setting the predetermined dilution factor f. Means are provided for calculating and storing the value TW=W/f which is the total weight of the sample plus the weight of the diluent which is required to dilute the sample to the predetermined dilution factor f. A pump is connected between a reservoir of diluent and the container for the sample for pumping the amount of diluent into the container which is required to dilute the sample to the predetermined weight dilution factor f. The scale provides a continuous output of the weight W of the sample plus diluent in the container at any instant in time. Means are provided for calculating when TW-W=0. In one embodiment, the flow of diluent to the container is stopped by the stopping of the pump when TW-W=0. In another embodiment, the flow of diluent to the container is stopped by closing a pair of valves located between the pump and the container when TW-W=0.

대표청구항 ▼

An apparatus for diluting a sample within a container to a dilution factor f by weight of diluent comprising: (a) means for repeatedly measuring the weight W of the sample plus any diluent within the container; (b) means for choosing a dilution factor f by weight of a diluent to be used for diluting

An apparatus for diluting a sample within a container to a dilution factor f by weight of diluent comprising: (a) means for repeatedly measuring the weight W of the sample plus any diluent within the container; (b) means for choosing a dilution factor f by weight of a diluent to be used for diluting the sample; (c) means for calculating TW wherein TW=W/f and W is the weight of the sample within the container prior to the addition of diluent; (d) means for calculating TW-W; (e) fluid conducting means disposed between a reservoir of diluent and the container for permitting the diluent to flow from the reservoir to the container for the purpose of diluting the sample within the container to the selected dilution factor f; and (f) means responsive to the means for calculating TW-W for controlling the flow of diluent between the reservoir and the container to cause diluent to flow between the container and the reservoir when TW>W and to stop the flow of diluent when TW=W.