Measurement of ozone concn. in water - in which coater is passed through to produce galvanic cell to produce current which indicates ozone concn. and cell is regenerated regularly by larger current flowing in same direction

摘要

In a new procedure for determining the concn. of ozone in water, the water is passed through a galvanic cell (1) and the current produced in the cell by the presence of ozone is measured. The novel feature is that in order to refresh or regenerate the cell, a current is passed through it in the same direction as the measuring current. Also claimed is a device for carrying out the procedure, consisting of a galvanic cell, a current measuring system (5), a concn. output device (6) and a source of current (8) for the regeneration process. Pref. the current used for regenerating the cell is larger than the measuring current, and in particular is large in comparison with this current. Regeneration is carried out at regular intervals under the control of a switch (9) and a timer (10). During regeneration measurement is interrupted and the device (6) continues to indicate the most recently measured concn. value. Resumption of measuring may be delayed beyond the end of the regeneration period. The electrodes (2,3) are cleaned to remove mechanical deposits, preferably by brushes. USE/ADVANTAGE - A practical measurement system is provided which produces reproducible results over a long period of time.