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In order to determine the density and mass flow rates of the pollutants released into the air as gas from the chimney, the amount of moisture in the flue gas must be measured. The Method-4 measurement method (gravimetric method), designed by the Environmental Protection Agency (EPA), is a flue gas moisture measurement system used in high temperature and dusty environments. Quality data are obtained with emission measurements made in accordance with the requirements of this method.
While the humidity is determined with the flue gas moisture probe, a gas sample is taken from the chimney at a certain flow rate and the moisture content in this gas is determined gravimetrically. In the Method-4 measurement method, the reference method or the approach method procedures are applied while taking the flue gas sample. Of these, the reference method is used to accurately determine the moisture content. This method is often used simultaneously with a pollutant emission sampling. In the approximation method, the moisture content in the chimney is estimated before sampling.
Method-4 flue gas moisture measurement system consists of the following parts: heated probe and dust holding unit, cooling (condensation) system, automatic level measurement system, flow controlled pump and system control unit.
