NEN EN 14625 : 2012

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Principle
   5.1 General
   5.2 Measuring principle
   5.3 Type approval test
6 Sampling equipment
   6.1 General
   6.2 Sampling location
   6.3 Sampling inlet and sampling line
   6.4 Particulate filter
   6.5 Control and regulation of sample flow rate
   6.6 Sampling pump for the manifold
7 Analyser equipment
   7.1 General
   7.2 Interferences
   7.3 Ultraviolet absorption cell
   7.4 Ultraviolet source lamp
   7.5 UV detector
   7.6 Ozone-specific scrubber
   7.7 Switching valve
   7.8 Temperature indicator
   7.9 Pressure indicator
   7.10 Flow rate indicator
   7.11 Sampling pump for the analyser
   7.12 Residence time in the sampling system and inside the
        analyser
   7.13 Internal ozone span source
8 Type approval of ultraviolet photometric ozone analysers
   8.1 General
   8.2 Relevant performance characteristics and performance
        criteria
   8.3 Design changes
   8.4 Procedures for determination of the performance
        characteristics during the laboratory test
   8.5 Determination of the performance characteristics during
        the field test
   8.6 Expanded uncertainty calculation for type approval
9 Field operation and ongoing quality control
   9.1 General
   9.2 Suitability evaluation
   9.3 Initial installation
   9.4 Ongoing quality control
   9.5 Calibration of the analyser
   9.6 Checks
   9.7 Maintenance
   9.8 Data handling and data reports
10 Expression of results
11 Test reports and documentation
   11.1 Type approval tests
   11.2 Field operation
Annex A (normative) Correction for ambient nitric oxide
Annex B (normative) Calculation of lack of fit
Annex C (informative) Sampling equipment
Annex D (informative) Sampling on micro scale
Annex E (informative) Ultra violet photometric analyser
Annex F (informative) Manifold testing equipment
Annex G (normative) Type approval
Annex H (normative) Calculation of uncertainty in field
        operation at the hourly alert threshold value
Bibliography

Defines a continuous measurement method for the determination of the concentrations of ozone present in ambient air based on the ultraviolet photometric measuring principle.