Apparatus for measuring and controlling alkalinity of non-aqueous liquids

Claim 1

CONTROL APPARATUS COMPRISING MEANS FOR DETECTING A VARIABLE CONSISTING OF AN IMPEDANCE OF A NON-AQUEOUS LIQUID, WHICH IMPEDANCE IS A FUNCTION OF ITS ALKALINITY, A FIRST MEANS PROVIDING AN OUTPUT SIGNAL RESPONSIVE TO SAID DETECTING MEANS AT A PREDETERMINED TIME IN EACH OF SUCCESSIVE CYCLES OF OPERATION OF THE APPARATUS, MEANS RETAINING SAID OUTPUT SIGNAL, A SECOND MEANS PROVIDING AN OUTPUT SIGNAL RESPONSIVE TO SAID DETECTING MEANS AT A PREDETERMINED LATER TIME IN EACH OF SUCCESSIVE CYCLES OF OPERATION OF THE APPARATUS, MEANS RECEIVING BOTH THE SECOND OUTPUT SIGNAL AND THE FIRST RETAINED OUTPUT SIGNAL AND PROVIDING A CONTROL SIGNAL IN THE EVENT THAT A PREDETERMINED RELATIONSHIP EXISTS BETWEEN SAID OUTPUT SIGNALS, MEANS RESPONSIVE TO SAID CONTROL SIGNAL, AND DEVICES OPERATED BY THE LAST MENTIONED MEANS TO AFFECT SAID VARIABLE BY MODIFICATION OF THE ALKALINITY OF SAID LIQUID, THE LAST MENTIONED DEVICES AFFECTING THE VARIABLE IN THE SAME SENSE AS IN A PRECEDING CYCLE IF ONE RELATIONSHIP EXISTS BETWEEN SAID OUTPUT SIGNALS, AND IN THE OPPOSITE SENSE IF AN OPPOSITE RELATIONSHIP EXISTS BETWEEN SAID OUTPUT SIGNALS.