EN 14792:2017

European foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Principle
6 Description of the measuring system
7 Performance characteristics of the SRM
8 Suitability of the measuring system to the measurement task
9 Field operation
10 Ongoing quality control
11 Expression of results
12 Equivalence of an alternative method
13 Measurement report
Annex A (informative) - Validation of the method in the field
Annex B (informative) - Sampling and conditioning configurations
Annex C (normative) - Determination of conversion efficiency
Annex D (informative) - Examples of different types of converters
Annex E (informative) - Calculation of the uncertainty associated
        with a concentration expressed for dry gas and
        at an oxygen reference concentration
Annex F (informative) - Example of assessment of compliance
        of chemiluminescence method for NO[x] with
        requirements on emission measurements
Annex G (informative) - Example of correction of data from
        drift effect
Annex H (informative) - Significant technical changes
Bibliography

This European Standard specifies the standard reference method (SRM) based on the chemiluminescence principle for the determination of the nitrogen oxides (NOx) in flue gases emitted to the atmosphere from ducts and stacks. It includes the sampling and the gas conditioning system, as well as the analyser. This European Standard specifies the characteristics to be determined and the performance criteria to be fulfilled by measuring systems based on this measurement method. It applies for periodic monitoring and for the calibration or control of automatic 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 prEN 14793.This European standard has been validated during field tests on waste incineration, co-incineration and large combustion installations and on a recognized test-bench. It has been validated for sampling periods of 30 min in the range of 0 mg/m3 to 1 300 mg/m3 of NO2 for large combustion plants and 0 mg/m3 to 400 mg/m3 of NO2 for waste incineration, according to emission limit values (ELV) laid down in the Directive 2010/75/EC.The ELV for NOx (NO + NO2) in EU directives are expressed in mg/m3 of NO2 on a dry basis, at a specified value for oxygen and at reference conditions (273 K and 101,3 kPa).NOTE The characteristics of installations, the conditions during field tests and the values of repeatability and reproducibility in the field are given in Annex F.