Electrolytic determination of the concentration of a constituent in a fluid

Claim 1

IN A SYSTEM FOR CONTINUOUSLY DETERMINING THE CONCENTRATION OF A CONSTITUENT IN A FLUID, THE COMBINATION OF A VESSEL CONTAINING ELECTROLYTE FORMING A TREATING ZONE FOR PASSAGE OF SAID FLUID THERETHROUGH, A FLOW-CONTROLLER FOR VARYING THE RATE OF FLOW OF SAID FLUID THROUGH SAID ZONE, MEANS INCLUDING A PAIR OF CURRENT ELECTRODES DISPOSED FOR FLOW OF DIRECT CURRENT THEREBETWEEN ELECTROLYTICALLY TO VARY THE CONCENTRATION OF SAID CONSTITUENTS IN SAID ZONE DURING ITS PASSAGE THROUGH SAID ZONE, POTENTIAL ELECTRODES DISPOSED IN SAID ELECTROLYTE, A MEASURING CIRCUIT CONNECTED TO SAID POTENTIAL ELECTRODES AND INCLUDING MEANS FOR PRODUCING A POTENTIAL OPPOSING THAT APPEARING BETWEEN SAID POTENTIAL ELECTRODES, AMPLIFYING MEANS HAVING AN INPUT CIRCUIT RESPONSIVE TO UNBALANCE BETWEEN SAID POTENTIALS FOR DEVELOPING A FLOW OF OUTPUT CURRENT, A SOURCE OF CURRENT, A CIRCUIT INCLUDING A CURRENT-REGULATOR FOR FLOW OF ELECTROLYZING CURRENT THROUGH SAID CURRENT ELECTRODES FROM SAID SOURCE, A SECOND CIRCUIT FOR FLOW SAID OUTPUT CURRENT FROM SAID AMPLIFIER TO SAID CURRENT ELECTRODES, ADJUSTING MEANS FOR SAID CURRENT-REGULATOR OPERABLE IN ACCORDANCE WITH THE OUTPUT FROM SAID AMPLIFIER TO BRING SAID CONCENTRATION OF SAID CONSTITUENT TO A PREDETERMINED VALUE, AND MEANS IN CIRCUIT WITH SAID ELECTRODES FOR MEASURING THE TOTAL FLOW OF ELECTROLYZING CURRENT.