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Abstract

A dilution extractive probe assembly for sampling a gas stream in a stack is provided. It includes a hollow tubular dilution probe having a first end for receiving a sample of the gas stream from the stack to be analyzed and a second end through which the sample is discharged after dilution. A first filter is provided at the first end of the probe for filtering the sample gas it passes into the probe. A critical orifice is located within the probe downstream of the first filter. A first heater is provided for heating the first filter to maintain the sample at a temperature above the dew point of the sample gas. A partial vacuum is created for drawing the sample through the filter and into the probe. An eductor is located adjacent the second end of the probe for mixing the sample with a dilution gas. A second heater for heating the eductor to maintain the sample gas at a temperature above its dew point as it passes through the eductor is provided.

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First Claim