Dosaging device for liquid media

摘要

A multiple liquid metering device of the type used in liquid analysis assemblies includes a valve block having an intermediate liquids storage vessel and a moving piston measurement burette. The valve block is provided with a plurality of inlet and outlet nozzles each of which is independently controlled by a valve. Internal passageways in the valve block allow the inlet nozzles to be selectively placed in communication with the burette and the burette to be selectively placed in communication with the intermediate receptacle. Stroke length of the piston and the burette is controlled by a program generator via a piston rod carried perforated disc supplying counting pulses to the program generator in response to activation of the piston motor to move the piston.