NBN EN 14792 : 2006

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
   4.1 General
   4.2 Measuring principle
5 Description of measuring equipment - Sampling and sample
   gas conditioning systems
   5.1 General
   5.2 Sampling line components
        5.2.1 Sampling line
        5.2.2 Filter
        5.2.3 Sample cooler (configuration 1)
        5.2.4 Permeation drier (configuration 2)
        5.2.5 Dilution system (configuration 3)
        5.2.6 Heated line and heated analyser (configuration 4)
        5.2.7 Sample pump
        5.2.8 Secondary filter
        5.2.9 Flow controller and flow meter
6 Analyser equipment
   6.1 General
   6.2 Converter
   6.3 Ozone generator
   6.4 Reaction chamber
   6.5 Optical filter
   6.6 Photomultiplier tube
   6.7 Ozone removal
7 Determination of the characteristics of the SRM: analyser,
   sampling and conditioning line
   7.1 General
   7.2 Relevant performance characteristics of the SRM and
        performance criteria
   7.3 Establishment of the uncertainty budget
8 Field operation
   8.1 Sampling location
   8.2 Sampling point(s)
   8.3 Choice of the measuring system
   8.4 Setting of the SRM on site
        8.4.1 General
        8.4.2 Preliminary zero and span check, and adjustments
        8.4.3 Zero and span checks after measurement
9 Ongoing quality control
   9.1 General
   9.2 Frequency of checks
10 Expression of results
11 Evaluation of the method in the field
12 Equivalence with an alternative method
13 Test report
Annex A (informative) Four different sampling and conditioning
        configurations
Annex B (normative) Determination of converter efficiency
   B.1 General
   B.2 First method: cylinder gases for calibration
   B.3 Second method: gaseous phase titration
Annex C (informative) Examples of different types of converters
   C.1 Quartz converter
   C.2 Low temperature converter (molybdenum)
   C.3 Stainless steel converter
Annex D (informative) Example of assessment of compliance
        of chemiluminescence method for NO[x] with requirements
        on emission measurements
   D.1 General
   D.2 Process of uncertainty estimation
        D.2.1 Determination of the model equation
        D.2.2 Quantification of uncertainty components
        D.2.3 Calculation of the combined uncertainty
   D.3 Specific conditions in the field
   D.4 Performance characteristics of the method
        D.4.1 NO measurement
        D.4.2 NO[x] measurement
        D.4.3 Results of standard uncertainties calculation
        D.4.4 Calculation of combined uncertainties
   D.5 Conversion of the concentrations in mg/m[3]
        D.5.1 No measurement
        D.5.2 NO[2] measurement
        D.5.3 NO[x] measurement
        D.5.4 Combined uncertainty
        D.5.5 Overall uncertainty
   D.6 Evaluation of the compliance with the required measurement
        quality
Annex E (informative) Procedure of correction of data from drift
        effect
Annex F (informative) Evaluation of the method in the field
   F.1 General
   F.2 Characteristics of installations
   F.3 Repeatability and reproducibility in the field
        F.3.1 General
        F.3.2 Repeatability
        F.3.3 Reproducibility
Annex ZA (informative) Relationship with EU Directives
Bibliography

Explains the chemiluminescence method, including the sampling and the gas conditioning system, to determine the NO/NO[2]/NO[X] concentrations in flue gases emitted from ducts and stacks to atmosphere.