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eLibrary > BS EN 14626:2024 Ambient air. Standard method for the measurement of the concentration of carbon monoxide by non-dispersive infrared spectroscopy >

BS EN 14626:2024 Ambient air. Standard method for the measurement of the concentration of carbon monoxide by non-dispersive infrared spectroscopy, 2024

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BS EN 14626:2024 Ambient air. Standard method for the measurement of the concentration of carbon monoxide by non-dispersive infrared spectroscopy, 2024

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1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviated terms
5 Principle [Go to Page]
5.1 General
5.2 Measuring principle
5.3 Type testing
5.4 Field operation and quality control
6 Sampling [Go to Page]
6.1 General
6.2 Sampling location
6.3 Sampling system [Go to Page]
6.3.1 Construction
6.3.2 Particle filter
6.3.3 Loss of carbon monoxide
6.3.4 Conditioning
6.4 Control and regulation of sample flow rate
6.5 Sampling pump for the manifold
7 Analyser equipment [Go to Page]
7.1 General
7.2 Details about analyser equipment
7.3 Pressure measurement
7.4 Flow rate indicator
7.5 Sampling pump for the analyser
7.6 Particle filter
8 Type testing of carbon monoxide analysers [Go to Page]
8.1 General
8.2 Relevant performance characteristics and performance criteria
8.3 Design change
8.4 Procedures for determination of the performance characteristics during the laboratory test [Go to Page]
8.4.1 General
8.4.2 Test conditions [Go to Page]
8.4.2.1 General
8.4.2.2 Parameters
8.4.2.3 Test gases
8.4.3 Response time [Go to Page]
8.4.3.1 General requirements
8.4.3.2 Test procedure
8.4.4 Short-term drift
8.4.5 Repeatability standard deviation
8.4.6 Lack of fit of linearity of the calibration function
8.4.7 Sensitivity coefficient to sample gas pressure
8.4.8 Sensitivity coefficient to the sample gas temperature
8.4.9 Sensitivity coefficient to the surrounding temperature
8.4.10 Sensitivity coefficient to electrical voltage
8.4.11 Interferents
8.4.12 Averaging test
8.4.13 Difference sample/calibration port
8.5 Determination of the performance characteristics during the field test [Go to Page]
8.5.1 General
8.5.2 Selection of a monitoring station for the field test
8.5.3 Operational requirements
8.5.4 Long-term drift
8.5.5 Reproducibility standard deviation under field conditions
8.5.6 Period of unattended operation
8.5.7 Period of availability of the analyser
8.6 Expanded uncertainty calculation for type testing
9 Field operation and ongoing quality control [Go to Page]
9.1 General
9.2 Suitability evaluation [Go to Page]
9.2.1 General
9.2.2 Analyser for a monitoring station or task
9.3 Initial installation
9.4 Ongoing quality assurance/quality control [Go to Page]
9.4.1 General
9.4.2 Frequency of calibrations, checks and maintenance
9.5 Calibration of the analyser [Go to Page]
9.5.1 General
9.5.2 Calibration gases
9.5.3 Data adjustment function
9.5.4 Testing the sampling system [Go to Page]
9.5.4.1 General
9.5.4.2 Procedure for measuring pressure drop induced by the manifold pump
9.5.4.3 Procedure for testing the sample collection efficiency of the sampling manifold
9.5.5 Treatment of data after exceedance of performance criteria
Figure 3 — Flow scheme for performance of evaluation of effects of violation of performance requirements and possibilities for data correction [Go to Page]
9.6 Checks [Go to Page]
9.6.1 Zero and span checks [Go to Page]
9.6.1.1 Zero and span gases
9.6.1.2 Performance of zero and span checks
9.6.2 Lack-of-fit
9.6.3 Testing the sampling system [Go to Page]
9.6.3.1 General
9.6.3.2 Procedure for measuring pressure drop induced by the manifold pump
9.6.3.3 Procedure for testing the sample collection efficiency of the sampling manifold
9.7 Maintenance [Go to Page]
9.7.1 Change of particle filters
9.7.2 Maintenance of sampling system
9.7.3 Change of consumables as applicable
9.7.4 Preventive/routine maintenance of components of the analyser
9.8 Data handling and data reports
9.9 Measurement uncertainty
10 Expression of results
11 Test reports and documentation [Go to Page]
11.1 Type testing
11.2 Field operation [Go to Page]
11.2.1 Suitability evaluation
11.2.2 Documentation
11.2.3 Ambient air quality data reports
Annex A (normative) Test of lack-of-fit [Go to Page]
A.1 Establishment of the regression line
A.2 Calculation of the residuals of the averages
Annex B (informative) Sampling equipment
Annex C (informative) Schematics of non-dispersive infrared spectrometer
Annex D (informative) Manifold testing
D.1 Procedure for applying test gas
D.2 Procedure for the cross test
D.2.1 General
D.2.2 Initial stage
D.2.3 Stage 1
D.2.4 Stage 2
D.2.5 Data Processing
D.2.6 Evaluation
Annex E (normative) Type testing [Go to Page]
E.1 Type testing and uncertainty calculation [Go to Page]
E.1.1 Type testing
E.1.2 Uncertainty calculation
E.2 Type testing Requirement a)
E.3 Type testing Requirement b) [Go to Page]
E.3.1 General
E.3.2 Calculation of standard uncertainties [Go to Page]
E.3.2.1 General
E.3.2.2 Repeatability at zero
E.3.2.3 Repeatability at the 8-hour limit value of carbon monoxide
E.3.2.4 Lack-of-fit
E.3.2.5 Influence quantities [Go to Page]
E.3.2.5.1 General
E.3.2.5.2 Sample gas pressure
E.3.2.5.3 Sample gas temperature
E.3.2.5.4 Surrounding temperature
E.3.2.5.5 Electrical voltage
E.3.2.5.6 Water vapour
E.3.2.5.7 Other interferents
E.3.2.5.8 Averaging effect
E.3.2.5.9 Calibration gas
E.3.2.5.10 Difference sample/calibration port
E.3.3 Example calculation
E.4 Type testing Requirement c)
E.5 Type testing Requirement d) [Go to Page]
E.5.1 General
E.5.2 Combined standard uncertainty
E.5.3 Absolute expanded uncertainty
E.5.4 Relative expanded uncertainty
E.5.5 Calculation of standard uncertainties
E.5.6 Example calculation
Annex F (informative) Calculation of uncertainty in field operation at the 8-hour limit value [Go to Page]
F.1 General
F.2 Combined standard uncertainty
F.3 Standard uncertainties [Go to Page]
F.3.1 General [Go to Page]
F.3.1.1 Introduction
F.3.1.2 Repeatability at zero
F.3.1.3 Repeatability at the 8-hour limit value
F.3.1.4 Lack-of-fit
F.3.2 Influence quantities [Go to Page]
F.3.2.1 General
F.3.2.2 Sample gas pressure
F.3.2.3 Sample gas temperature
F.3.2.4 Surrounding temperature
F.3.2.5 Electrical voltage
F.3.3 Interferents [Go to Page]
F.3.3.1 General
F.3.3.2 Water vapour
F.3.3.3 Other interferents
F.3.4 Averaging effect
F.3.5 Reproducibility under field conditions
F.3.6 Long-term drift at zero
F.3.7 Long-term drift at level of the 8-hour limit value
F.3.8 Zero gas
F.3.9 Calibration gas
F.3.10 Difference sample/calibration port
F.4 Example calculation
Annex G (informative) Test stand for the test point "sensitivity coefficient of sample gas pressure"
Annex H (informative) Significant changes [Go to Page]

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BS EN 14626:2024 Ambient air. Standard method for the measurement of the concentration of carbon monoxide by non-dispersive infrared spectroscopy, 2024

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