Applicable Measuring Range of Two-Electrode Type Commercial Electrolytic Conductivity Meter for Accurate Determination of Electrolytic Conductivity

Figure 5

The cell constants of (a) ECM-1 and (b) ECM-2 obtained by calibration using the seven KCl standard solutions. Open circles are calculated by measured solution resistance and open squares are calculated by measured resistance subtracted cable resistance. The calculated cable resistances were 0.25 Ω (ECM-1) and 0.37 Ω (ECM-2). The bars were expanded uncertainties () which were estimated by the combination of the following uncertainties: resistances of the LCR meter (0.025%), thermometer (0.008%), measurement repeatability (less than 0.1%), and the cell constant of NMIJ secondary Jones-type cell (0.28%).

(a)

(b)