BSI PD CEN/TS 18040:2024

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Stationary source emissions. Determination of the mass concentration of formaldehyde. Automatic method

Published By	Publication Date	Number of Pages
BSI	2024	44

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Categories: 13.040.40 - Stationary source emissions, BSI

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This document specifies a measurement method based on an automatic method for determination of the mass concentration of formaldehyde in ducts and stacks emitting to the atmosphere. It specifies the sampling and gas conditioning system. Furthermore, it specifies the characteristics to be determined and the performance criteria to be fulfilled by portable automated measuring systems (P-AMS) using appropriate techniques to measure formaldehyde. This method is intended for intermittent monitoring of formaldehyde emissions as well as for the calibration and validation of automated formaldehyde measuring systems. The analyser is calibrated using test gases produced by a test gas generator.

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PDF Pages	PDF Title
2	undefined
7	1 Scope 2 Normative references 3 Terms and definitions
11	4 Principle 4.1 General
12	4.2 Measuring principle 5 Sampling system 5.1 General 5.2 Sampling probe
13	5.3 Filter 5.4 Sampling line 5.4.1 General 5.4.2 Heated sampling system (configuration 1) 5.4.3 Conditioning system with dilution (configuration 2) 5.5 Sample pump 6 Test gas generator equipment
14	7 Analyser equipment 8 Determination of the characteristics of the method 8.1 General 8.2 Relevant performance characteristics and performance criteria 8.3 Establishment of the uncertainty budget
16	9 Field operation 9.1 Measurement plan and sampling strategy 9.2 Setting of the analyser on site 9.2.1 General 9.2.2 Preliminary zero and span check, and adjustments 9.2.2.1 Test gases
17	9.2.2.2 Adjustment of the analyser 9.2.2.3 Zero gas check of the measuring system 9.2.2.4 Check of the sampling system for leaks and losses
18	9.2.3 Zero and span checks after measurement 10 Ongoing quality control 10.1 Introduction 10.2 Frequency of checks
19	11 Expression of results 12 Measurement report
20	Annex A (informative)Example of assessment of compliance of the method with requirements on emission measurement A.1 Procedure for evaluating uncertainty A.1.1 Determination of model function
21	A.1.2 Quantification of input quantities and associated uncertainties A.1.3 Calculation of the combined standard uncertainty A.1.4 Expanded uncertainty
22	A.2 Example of uncertainty evaluation A.2.1 General A.2.2 Specific conditions on the site
23	A.2.3 Performance characteristics of the method A.2.4 Calculation of the combined uncertainty of formaldehyde concentration A.2.4.1 Model equation and application of the law of uncertainty propagation
24	A.2.4.2 Calculation of the partial uncertainties
29	A.2.4.3 Result of partial uncertainties calculation
30	A.2.4.4 Calculation of the combined uncertainty A.2.4.5 Calculation of the expanded uncertainty
31	Annex B (informative)Uncertainty associated with the gas concentration generated by a test gas generator from a solution B.1 Calculation of the concentration of formaldehyde generated
33	B.2 Calculation of uncertainty B.2.1 Calculation of uncertainty of associated with molar mass of solution
34	B.2.2 Calculation of uncertainty associated with density of solution B.2.3 Calculation of uncertainty associated with nH2O
35	B.2.4 Calculation of uncertainty of associated with concentration of CHOH generated
36	B.3 Standard uncertainties
38	Annex C (informative)Calculation of the uncertainty associated with a concentration expressed on dry gas at an oxygen reference concentration C.1 Uncertainty associated with a concentration expressed on dry gas
40	C.2 Uncertainty associated with a concentration expressed at oxygen reference concentration