Importance

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Abstract

A photometric analyzer for measuring differential total reduced sulfur in a sample gas stream is provided. It includes a supply for a sulfur bearing gas sample, an oven having an inlet connected to the supply for converting TRS to SO.sub.2 and an outlet through which the gas sample is discharged. A valve is connected to the outlet of the oven. An SO.sub.2 bypass line is connected between the supply and the valve. A sample cell with transparent ends has an inlet adjacent one end connected to the valve for alternately receiving sample gas from either the oven or the bypass line and has an outlet adjacent the other end. A pump connected to the sample cell outlet draws the gas sample through the sample cell. A light source at the one end of the sample cell directs light of a predetermined wave length through the sample cell. A light sensing device at the other end detects the amount of light passing through the sample cell at any given time and provides an output signal to an analyzer. The analyzer determines the TRS in the gas sample. Zero air is supplied to the valve so that the zero air can be cycled into the sample cell for measurement by the analyzer to determine SO.sub.2 levels in the sample gas. A heat exchanger assures that each of the gases and air are at a constant temperature. The pressure of the gases and air is held at a constant pressure as they pass through the sample cell by a pressure regulator.

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