[On the determination of chlorine with a polarographic probe. 1st communication: Examination of the physical properties of the new instrument (author's transl)].

A new chlorine measuring device for the field use in the water plant praxis was tested. The portable instrument supplied with a selectively permeable membrane works basing on the polarographic principle and shall allow an easy and accurate measurement of the "disinfectingpower" of a water chlorination. In the 1st note most important possibilities of meter-default as dependence on streamvelocity of water, pH and temperature are described. Furter the phenomenon of hysteresis is demonstrated.