Importance

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Abstract

The present disclosure is directed to a controlled, timed, cyclically operated sample taking apparatus for use with a stack. A fitting at the top portion of the stack positions a probe having an opening for removal of a gas sample from the stack discharge stream which sample is delivered along a sample line on the stack to ground located equipment. The sample stream is delivered through a means which periodically is operated to take a portion of that sample and deliver that through a sample storage line into a constant pressure storage cylinder. The cylinder is filled to capacity. Surplus sample which is not required is returned through a aspirator powered by a flow of compressed air to boost the surplus or unwanted sample through a sample return line back into the stack discharge stream.

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First Claim