Research Article

Non-obvious Problems in Clark Electrode Application at Elevated Temperature and Ways of Their Elimination

Figure 1

Change of the partial pressure of the gas in solutions separated by a gas-permeable membrane during the forced heating of one of them: (a) initial equilibrium state ( Const, Const), (b) heating ( ; ). The wavy arrows are heat transfer; white arrows are the diffusion of the dissolved gas. (1) is the first liquid, (2) is second liquid, (3) is gas-permeable membrane, (4) is the heating of the first fluid from an external source of heat, (5) is heat loss, (6) is heating of the second liquid through the membrane, and (7) is diffusion of dissolved gases. The temperature of the first liquid which (1) is heated from the outside (4) increases faster than temperature of the second (2), and therefore the partial pressure of gases dissolved in the first liquid is also increasing rapidly. The resulting difference in partial pressures causes diffusion of dissolved gases (7) from the first liquid into the second through gas-permeable membrane separating them (3).
249752.fig.001a
(a)
249752.fig.001b
(b)