Control system

Claim 1

IN A POLYMERIZATION SYSTEM INCLUDING A REACTOR, FIRST CONDUIT MEANS COMMUNICATING WITH SAID REACTOR TO INTRODUCE MATERIAL TO BE POLYMERIZED, SECOND CONDUIT MEANS COMMUNICATING WITH SAID REACTOR TO INTRODUCE A SOLVENT, THIRD CONDUIT MEANS COMMUNICATING WITH SAID REACTOR TO INTORDUCE A CATALYST, FOURTH CONDUIT MEANS COMMUNICATING WITH SAID REACTOR TO REMOVE A PRODUCT, HEAT EXCHANGE CONDUIT MEANS IN COMMUNICATION WITH SAID REACTOR TO REMOVE HEAT, A FLASH TANK, FIFTH CONDUIT MEANS COMMUNICATING BETWEEN SAID FLASH TANK AND SAID HEAT EXCHANGE CONDUIT MEANS TO INTRODUCE A LIQUID COOLANT INTO SAID HEAT EXCHANGE CONDUIT MEANS, SIXTH CONDUIT MEANS COMMUNICATING BETWEEN SAID HEAT EXCHANGE CONDUIT MEANS AND SAID FLASH TANK TO RETURN VAPOR TO SAID FLASH TANK, A CONDENSER, SEVENTH CONDUIT MEANS TO PASS VAPOR FROM SAID FLASH TANK THROUGH SAID CONDENSER AND TO RETURN CONDENSATE TO SAID FLASH TANK; APPARATUS FOR MEASURING THE RATE OF POLYMER PRODUCTION COMPRISING MEANS TO ESTABLISH A FIRST VOLTAGE REPRESENTATIVE OF THE DIFFERENCE BETWEEN THE TEMPERATURE OF THE REACTOR AND THE TEMPERATURE OF SOLVENT IN SAID SECOND CONDUIT MEANS; MEANS TO ESTABLISH A SECOND VOLTAGE REPRESENTATIVE OF THE DIFFERENCE BETWEEN THE TEMPERATURE OF THE REACTOR AND THE TEMPERATURE OF MATERIAL IN SAID FIRST CONDUIT MEANS; MEANS TO ESTABLISH A THIRD VOLTAGE REPRESENTATIVE OF THE HEAT OF SOLUTION OF THE MATERIAL TO BE POLYMERIZED IN SAID SOLVENT FIRST, SECOND AND THIRD POTENTIOMETERS ; MEANS APPLYING SAID FIRST, SECOND AND THIRD VOLTAGES ACROSS THE END TERMINALS OF SAID FIRST, SECOND AND THIRD POTENTIOMETERS, RESPECTIVELY; MEANS TO SUM THE VOLTAGES BETWEEN FIRST END TERMINALS AND CONTACTORS OF SAID FIRST, SECOND ANND THIRD POTENTIOMETERS TO ESTABLISH A FOURTH VOLTAGE; MEANS TO ESTABLISH A FIFTH VOLTAGE REPRESENTATIVE OF THE DIFFERENCE BETWEEN THE TEMPERATURE OF MATERIAL IN SAID REACTOR AND VAPOR IN SAID FLASH TANK; MEANS TO ESTABLISH A SIXTH VOLTAGE REPRESENTATIVE OF THE HEAT OF VAPORIZATION OF SAID COOLANT; MEANS TO ESTABLISH A SEVENTH VOLTAGE REPRESENTATIVE OF THE DIFFERENCE BETWEEN REFERENCE TEMPERATURE AND THE TEMPERATURE OF VAPOR IN SAID FLASH TANK; MEANS TO ESTABLISH AN EIGHTH VOLTAGE REPRESENTATIVE OF HEAT LOSS FROM SAID REACTOR; FOURTH, FIFTH, SIXTH AND SEVENTH POTENTIOMETERS; MEANS APPLYING SAID FIFTH, SIXTH, SEVENTH AND EIGHTH VOLTAGES ACROSS THE END TERMINALS OF SAID FOURTH, FIFTH, SIXTH AND SEVENTH POTENTIOMETERS, RESPECTIVELY; MEANS TO SUM THE VOLTAGES BETWEEN FIRST END TERMINALS AND CONTACTORS OF SAID FOURTH, FIFTH, SIXTH AND SEVENTH POTENTIOMETERS TO ESTABLISH A NINTH VOLTAGE; AND MEANS TO COMPARE SAID NINTH VOLTAGE WITH SAID FOURTH VOLTAGE.