Hydrogen sulfide detection method and control system

Claim 1

A HYDROGEN SULFIDE CONTROL SYSTEM COMPRISING: (A) A NATURAL GAS STREAM FROM A SOURCE OF SOUR GAS CARRYING UNACCEPTABLE AMOUNTS OF HYDROGEN SULFIDE, (B) SWEETENING MEANS FOR REMOVING HYDROGEN SULFIDE FROM SAID NATURAL GAS STREAM AND PROVIDING INTO A GAS CONDUIT A TREATED NATURAL GAS STREAM WITH A REDUCED HYDROGEN SULFIDE CONTENT FOR A FIRST PERIOD OF TIME, AND THEREAFTER FOR A SECOND PERIOD OF TIME, A TREATED NATURAL GAS STREAM WITH AN UNACCEPTABLE LARGER AMOUNT OF HYDROGEN SULFIDE, (C) A FLUID TRANSFER MEMBER TO CONTROL THE FLOW THROUGH SAID GAS CONDUIT OF THE TREATED NATURAL GAS, AND (D) A DETECTOR COMPRISING (1) A RESERVOIR ADAPTED TO CONTAIN LIQUIDS, (2) A WATER SOLUTION OF A METAL ION PRODUCING BY REACTION WITH HYDROGEN SULFIDE AN INSOLUBLE PRECIPITATE AND EXCESS HYDROGEN IONS, SAID WATER SOLUTION RESIDING IN THE RESERVOIR, (3) INLET MEANS CONNECTED TO THE GAS CONDUIT FOR PASSING A PORTION OF THE TREATED NATURAL GAS FROM THE GAS CONDUIT INTO SAID WATER SOLUTION, (4) THE METAL ION BEING ADJUSTED AT A CONCENTRATION IN SAID SOLUTION THAT ACCEPTABLE AMOUNTS OF HYDROGEN SULFIDE IN THE PORTION OF SAID TREATED NATURAL GAS PASSED INTO THE SOLUTION IN SAID FIRST PERIOD OF TIME ARE NONREACTIVE TO PRODUCE A CERTAIN AMOUNT OF EXCESS HYDROGEN IONS IN THE WATER