Versatile instrument for direct or differential a.c. resistance or conductance measurements on solutions.
A simple but versatile instrument with an electronic (non-servo) measuring circuit is described which is capable of making direct or differential measurements of the resistance or conductance of solutions over an absolute resistance range from 0-1 Omega to l MOmega, in six linear ranges. Linearity is better than 2% on all ranges, and reproducibility is better than 1 %. Drift is less than 1 % over 12 hr. Less than 0-01 % change in resistance can be measured in the differential modes, permitting more sensitive measurements than can be made in direct conductance measurements. Applications of the instrument for monitoring ion-exchange separations and conductometric titrations are illustrated.
Olsen
E D
ED
Chemistry Department, University of South Florida, Tampa, Florida 33620, U.S.A.
Martin
R J
RJ