Time Constant of a Thomas Autometer and Significance of Indicated Response.

Abstract

The time constant of a Thomas sulfur dioxide analyzer was determined by measurements at various concentration levels. The arithmetic mean time constant was found to be 46.0 seconds with a standard deviation of 5.5 seconds. A study was made of the peak values observed when known concentrations of sulfur dioxide were injected into the sample air stream for periods of a few seconds to 200 seconds. The area

Effects of gaseous air pollutants on the response of the Thomas sulfur dioxide Autometer

“…The time required for the Autometer to reach a stable reading with S02 was about 1/4 hour X p.p.m. level, much longer than the 212 seconds reported by Sanderson, Penner, and Katz (1964) in a study of Autometer response to short fumiga-tion periods. This was probably due to the large volume of the sample system used in the present study.…”

Air Pollution

“…Modifications of existing instrumentation have been described (121,196). The response characteristics of the Thomas Autometer were studied (223).…”