Calibration of stack gas instrumentation

Experience in stack gas instrumentation calibration is presented, based on a study involving the measurement of sulfur dioxide in the stack of a power plant and in the exit gases from a Claus sulfur recovery incinerator. Calibrations were performed by the use of analyzed cylinders of gas. The method of presenting the calibration gas to the analyzers is described, and data are presented to provide comparisons of the resulting instrumental readings with correlated, independent determinations made by the standard reference (manual) method for sulfur dioxide in stack gas.