Apparatus for sulfur dioxide determination

Claim 1

APPARATUS FOR CONTINUOUSLY MEASURING THE CONCENTRATION OF SULFUR DIOXIDE IN A GAS MIXTURE WHICH IS ESSENTIALLY FREE FROM OTHER CONSTITUENTS WHICH DISSOLVE IN WATER TO FORM AN ELECTROLYTE, WHICH COMPRISES: FIRST CONTACT MEANS FOR INTIMATELY CONTACTING COUNTERCURRENTLY A RELATIVELY LARGE VOLUME OF THE GAS MIXTURE WITH A RELATIVELY SMALL VOLUME OF AN AQUEOUS SOLUTION OF SULFUR DIOXIDE AND SECOND CONTACT MEANS FOR CONTACTING THE GAS MIXTURE CONTAINING SULFUR DIOXIDE WITH WATER TO FORM SAID AQUEOUS SOLUTION OF SULFUR DIOXIDE, MEANS FOR INTRODUCING THE GAS MIXTURE INTO SAID FIRST CONTACT MEANS, INCLUDING A GAS DUCT, MEANS FOR WITHDRAWING EXIT GASES FROM SAID SECOND CONTACT MEANS, AN ELECTRICAL CONDUCTIVITY CELL ADAPTED TO RECEIVE SULFUR DIOXIDE SOLUTION PRODUCED IN THE FIRST CONTACT MEANS, SAID CELL HAVING SPACED ELECTRODES FOR USE IN MEASURING THE ELECTRICAL CONDUCTIVITY OF THE SOLUTION, A LIQUID CONDUIT CONNECTING SAID CELL TO SAID FIRST CONTACT MEANS, TEMPERATURE-REGULATING MEANS SURROUNDING THE FIRST CONTACT MEANS, THE GAS DUCT AND THE CONDUCTIVITY CELL FOR MAINTAINING A SUBSTANTIALLY UNIFORM TEMPERATURE THEREIN, MEANS FOR MAINTAINING THE ELECTRODES OF THE CONDUCTIVITY CELL COVERED BY SAID SOLUTION, AND MEANS FOR CONNECTING THE ELECTRODES TO ELECTRICAL MEASURING MEANS.