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

Figure 5

Dynamics of temperature difference between the incubation medium and the oxygen sensor electrolyte (a) at temperature equilibrium of the thermostat; (b) at temperature equilibrium of the incubation medium; and (c) at temperature equilibrium of the sensor electrolyte. Electrolyte of sensor clearly begins to warm up before stabilization of the thermostat’s temperature (a). Because rate of thermostat’s heating near the temperature of the thermostating is sharply slowed down, speed of the electrolyte’s warming-up exceeds the rate of warming up of the medium from 20 to 130 min (c) from the moment of switching the thermostat. Thus, conditions for the diffusion of gases from the sensor to the incubation medium remain over 110 min. Stabilization of the medium temperature (b) does not render appreciable influence on this process.