Regeneration control for ion exchange beds

Claim 1

IN A CONTROL FOR SENSING A REGENERATION REQUIREMENT OF AN ION EXCHANGE BED ADAPTED TO HAVE A FLUID PASSED THERETHROUGH, A FIRST PAIR OF ELECTRODE MEANS EMBEDDED IN THE DOWNSTREAM PORTION OF THE ION EXCHANGE BED, A SECOND PAIR OF ELECTRODE MEANS EMBEDDED UPSTREAM OF THE FIRST PAIR OF ELECTRODE MEANS, AN ELECTRORESPONSIVE DETECTOR, A BRIDGE CIRCUIT INCLUDING SAID ELECTRORESPONSIVE DETECTOR IN THE OUTPUT CIRCUIT AND SAID FIRST AND SECOND PAIRS OF ELECTRODE MEANS CONNECTED IN PARALLEL BRANCHES OF THE BRIDGE CIRCUIT TO ESTABLISH CURRENT FLOW TO THE ELECTRORESPONSIVE DETECTOR IN ACCORDANCE WITH THE DIFFERENCE IN THE CONDUCTIVITY OF THE UPSTREAM AND THE DOWNSTREAM PORTIONS OF THE BED, AND IMPEDANCES CONNECTED IN THE REMAINING BRANCHES OF THE BRIDGE CIRCUIT, AT LEAST ONE OF SAID IMPENDANCES BEING ADJUSTABLE TO ALLOW SETTING OF THE LEVEL OF ENERGIZATION OF THE ELECTRORESPONSIVE DETECTOR FOR ANY GIVEN CURRENT FLOW THROUGH SAID FIRST AND SECOND ELECTRODE MEANS.