Conductivity monitoring system

Claim 1

AN ELECTRIC SYSTEM FOR MONITORING THE SALINE CONTENT OF A LIQUIE, SAID SYSTEM COMPRISING A CONDUCTIVITY CELL IN THERMAL PROXIMITY TO THE LIQUID TO BE MONITORED, SAID CELL INCLUDING A PAIR OF ELECTRODES ADAPTED TO BE IMMERSED IN SAID LIQUID AND A TEMPERATURE RESPONSIVE TO RESISTOR IN SERIES CIRCUIT THEREWITH, SAID CELL BEING CONNECTED TO A SOURCE OF ALTERNATING ELECTRIC CURRENT WHEREBY VARIATIONS IN THE ELECTRICAL RESISTANCE OF THE FLUID AFFECT THE FLOW OF CURRENT THERETHROUGH, A METER CIRCUIT FOR INDICATING THE STATE OF SAID CURRENT FLOW AND A RELAY CIRCUIT FOR ACTUATING AN INDICATOR WHEN THE SALINITY OF SAID LIQUID EXCEEDS A PREDTERMINED VALUE, SAID METER AND RELAY CIRCUITS BEING IN PARALLEL CIRCUIT CONNECTION WITH SAID TEMPERATURE RESPONSIVE RESISTOR, SAID RELAY CIRCUIT INCLUDING A RELAY AND VARIABLE RESISTOR, SAID VARIABLE RESISTOR BEING CONNECTED IN PARALLEL WITH THE RELAY TERMINALS AND A FIXED RESISTOR CONNECTED IN SERIES CIRCUIT WITH THE PARALLEL NETWORK FORMED BY SAID RELAY AND VARIABLE RESISTOR.