AN EFFECTIVE CONDUCTIVITY AMPLIFIER AND COMPUTER INTERFACING SYSTEM FOR CHEMICAL-KINETICS

A simple and reliable conductivity amplifier and a computer interfacin g system for the chemical kinetics in solution are developed. They uti lize the simplifications in circuit design offered by a function gener ator, operational amplifiers and true RMS to DC converter, and a 12 bi t dual slope integrating analog-digital converter is interfaced to a p ersonal computer through an 8255A programmable peripheral interface (P PI). It has a good sensitivity of 224 ppm and a low conductance drift of -200 ppm/degrees-C with temperature variation. In addition, a graph ic computer software CCP(conductance checking program) which is capabl e of storing and analyzing conductance data for the first order kineti cs is developed.