Basic Procedures for Emission Measurements

Basically, emission measurements are carried out by using either of two sam­pling methods:

• the extractive (or diluting) method, by which the sample gas from the exhaust channel is led to the analyzer (or taken to the laboratory) through a sampling tube line, or

• the In situ method, in which a sensor is placed in the outlet pipe or the measurement is performed across the pipe, in the case of optical methods.

Measurement principles are shown in Fig. 13.38.

For the analysis of total emissions, the volumetric flow of the emission gas must be measured in addition to its concentration. This is based on the gas ve­locity in the duct.

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