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适用范围：This European Standard describes the condensation/adsorption technique, including the sampling system, todetermine the water vapour concentration in the flue gases emitting to atmosphere from ducts and stacks.This technique is usually used all over Europe for water vapour monitoring. However to be implemented asthe Standard Reference Method (SRM), the user has to demonstrate that the performance characteristics ofthe method are better than the performance criteria defined in this European Standard and that the overalluncertainty of the method is less than + _20 % of the measured value. This European Standard as theStandard Reference Method (SRM) is used for periodic monitoring and for calibration or control of AutomaticMeasuring Systems (AMS) permanently installed on a stack, for regulatory purposes or other purposes.An Alternative Method to this SRM may be used provided that the user can demonstrate equivalenceaccording to the Technical Specification CEN/TS 14793, to the satisfaction of his national accreditation bodyor law.The determination of water vapour is mainly necessary for:-- regulatory purposes, to express the concentration at standard conditions (on dry gas);-- adjust the flow rate for isokinetic sampling, when a dry gas flow rate metering device is used.For both applications, the quantity to be measured is the amount of water present in the gas phase (vapour),which does not include water droplets.This European Standard is applicable in the range from 4 % to 40 % relative humidity and for water vapourconcentration from 29 g/m3 to 250 g/m3 as a wet gas, although for a given temperature the upper limit of themethod is related to the maximum pressure of water in air or in the gas.This European Standard has been evaluated during field tests on waste incineration, co-incineration and largecombustion installations. It has been validated for sampling periods of 30 min in the concentration range of7 % to 26 % volume.In this European Standard all the concentrations are expressed in normal conditions (273 K and 101,3 kPa).NOTE For saturated conditions the condensation/adsorption method is not applicable. Some guidance is given in thisEuropean Standard to deal with flue gas when droplets are present.