DIN EN 14790:2017-05

This European Standard specifies the standard reference method (SRM) based on a sampling system with a condensation/adsorption technique to determine the water vapour concentration in the flue gases emitted to atmosphere from ducts and stacks. This European Standard specifies the performance characteristics to be determined and performance criteria to be fulfilled by measuring systems based on the measurement method. It applies to periodic monitoring and to the calibration or control of automated measuring systems (AMS) permanently installed on a stack, for regulatory or other purposes. This European Standard specifies criteria for demonstration of equivalence of an alternative method to the SRM by application of EN 14793:2017. This European Standard is applicable in the range of water vapour content from 4 % to 40 % as volume concentrations and of water vapour mass concentration from 29 g/m³ to 250 g/m³ as a wet gas, although for a given temperature the upper limit of the method is related to the maximum pressure of water in air or in the gas. In this European Standard all the concentrations are expressed at standard conditions (273 K and 101,3 kPa). This European Standard has been validated during field tests on waste incineration, co-incineration and large combustion plants with sampling periods of 30 min for volume concentrations of 7 % to 26 %. The revised version of EN 14789:2006 contains corrections and adaptations to newer standards. These include in particular: - Directive 2000/76/EC has been replaced by Directive 2010/75/EU; - the normative reference to EN 13284-1 has been replaced by EN 15259 regarding requirements for measurement sections and sites and for the measurement objective, plan and report; - the definitions have been revised taking the definitions in EN 15259 into account and the new version of VIM (2012); - the detection limit has been deleted from the list of definitions and performance characteristics as repeatability at zero is more suitable; - the symbols and abbreviations used in the main section of the document have been included; - requirements for measurement planning have been added with reference to EN 15259;- a reference to EN 15259 has been added to determine the homogeneity of the exhaust gas profile; - the standard deviation sr,limit according to new rules specified in EN 14793 has been recalculated; - an estimate for the expanded uncertainty calculated on the basis of the comparison precision has been included, replacing the expression "external confidence interval"; - presentation of the calculation of the uncertainty budget has been improved. This European Standard is intended in particular for testing laboratories that use standard reference methods within the scope of periodic measurements, for manufacturers of corresponding measuring equipment, for testing institutes that conduct performance tests of such measuring equipment, for plant operators and for supervisory authorities. This European Standard deals in particular with aspects of environmental protection and quality control in emission monitoring. The responsible committee for this standard is NA 134-04-01 AA "Emissionsmessverfahren" ("Emission measurement techniques") at DIN.