Testing equivalency of an alternative method based on portable FTIR to the European Standard Reference Methods for monitoring emissions to air of CO, NO_x, SO₂, HCl, and H₂O

Figures & data

Table 1. CEN/TS 14793 pro forma for determining and summarising test data in comparing if an alternative method is equivalent to an SRM.

Verification tests	Value obtained	Critical value	Conclusion
Systematic deviation
Validation of the test			Acceptable Y/N?
Slope			Acceptable Y/N?
Intercept			Acceptable Y/N?
Repeatability
Standard uncertainty of SRM			Acceptable Y/N?
Standard uncertainty of AM			Acceptable Y/N?

Figure 1. Orthogonal regression of mean AM (TGN M22/FTIR) vs. mean SRM (EN 14790/gravimetry) measurements of water vapor in the NPL Stack Simulator facility in a changing gas matrix of CO/NO/SO₂/HCl at 180°C and 12 m s⁻¹ velocity.

Table 2. CEN/TS 14793 test of equivalence of TGN M22/FTIR to EN 14790/gravimetry for measurements of water vapour across a concentration range of 0–14 vol%.

Verification tests	Value obtained	Critical value	Conclusion
Systematic deviation
Validation of the test	0.995	≥0.97	Y
Slope	0.987	≥0.929 and ≤1.071	Y
Intercept	0.306	≥–0.64 and ≤0.64	Y
Repeatability
Standard uncertainty of SRM	0.42	≤0.44	Y
Standard uncertainty of AM	0.42	≤0.44	Y

Table 3. CEN/TS 14793 test of equivalence of TGN M22/FTIR to EN 14791/impinger train and ion chromatography for measurements of SO₂ across a concentration range of 0–75 mg m⁻³.

Verification tests	Value obtained	Critical value	Conclusion
Systematic deviation
Validation of the test	0.995	≥0.97	Y
Slope	1.106	≥0.877 and ≤1.123	Y
Intercept	1.421	≥–3.43 and ≤3.43	Y
Repeatability
Standard uncertainty of SRM	2.5	≤3.7	Y
Standard uncertainty of AM	2.0	≤3.7	Y

Table 4. CEN/TS 14793 test of equivalence of TGN M22/FTIR to EN 14791/impinger train and ion chromatography for measurements of SO₂ across a concentration range of 0–200 mg m⁻³.

Verification tests	Value obtained	Critical value	Conclusion
Systematic deviation
Validation of the test	0.998	≥0.97	Y
Slope	1.057	≥0.916 and ≤1.084	Y
Intercept	2.744	≥–5.12 and ≤5.12	Y
Repeatability
Standard uncertainty of SRM	2.8	≤5.4	Y
Standard uncertainty of AM	2.1	≤5.4	Y

Table 5. CEN/TS 14793 test of equivalence of TGN M22/FTIR to EN 14792/chemiluminescence for measurements of NO across a concentration range of 0–200 mg m⁻³.

Verification tests	Value obtained	Critical value	Conclusion
Systematic deviation
Validation of the test	1.00	≥0.97	Y
Slope	1.026	≥0.963 and ≤1.037	Y
Intercept	2.37	≥–3.58 and ≤3.58	Y
Repeatability
Standard uncertainty of SRM	1.5	≤3.6	Y
Standard uncertainty of AM	2.3	≤3.6	Y

Table 6. CEN/TS 14793 test of equivalence of TGN M22/FTIR to EN 14792/chemiluminescence for measurements of NO across a concentration range of 0–300 mg m⁻³.

Verification tests	Value obtained	Critical value	Conclusion
Systematic deviation
Validation of the test	1.00	≥0.97	Y
Slope	0.99	≥0.970 & ≤1.030	Y
Intercept	4.99	≥–4.26 & ≤4.26	N
Repeatability
Standard uncertainty of SRM	2.2	≤4.3	Y
Standard uncertainty of AM	3.4	≤4.3	Y

Table 7. CEN/TS 14793 test of equivalence of TGN M22/FTIR to EN 15058/NDIR for measurements of CO across a concentration range of 0–75 mg m⁻³.

Verification tests	Value obtained	Critical value	Conclusion
Systematic deviation
Validation of the test	1.00	≥0.97	Y
Slope	1.00	≥0.86 and ≤1.14	Y
Intercept	3.00	≥–3.27 and ≤ 3.27	Y
Repeatability
Standard uncertainty of SRM	0.9	≤3.3	Y
Standard uncertainty of AM	0.8	≤3.3	Y

Table 8. CEN/TS 14793 test of equivalence of TGN M22/FTIR to EN 15058/NDIR for measurements of CO across a concentration range of 0–100 mg m⁻³.

Verification tests	Value obtained	Critical value	Conclusion
Systematic deviation
Validation of the test	1.00	≥0.97	Y
Slope	0.99	≥0.87 and ≤1.13	Y
Intercept	3.09	≥–3.31 and ≤3.31	Y
Repeatability
Standard uncertainty of SRM	1.0	≤3.3	Y
Standard uncertainty of AM	1.2	≤3.3	Y

Table 9. CEN/TS 14793 test of equivalence of TGN M22/FTIR to EN 1911/impinger train and ion chromatography for measurements of HCl across a concentration range of 0–15 mg m⁻³.

Verification tests	Value obtained	Critical value	Conclusion
Systematic deviation
Validation of the test	0.983	≥0.97	Y
Slope	1.040	≥0.919 & ≤1.081	Y
Intercept	0.322	≥–0.50 & ≤0.50	Y
Repeatability
Standard uncertainty of SRM	0.3	≤0.3	Y
Standard uncertainty of AM	0.3	≤0.3	Y

Table 10. CEN/TS 14793 test of equivalence of TGN M22/FTIR to EN 1911/impinger train and ion chromatography for measurements of HCl across a concentration range of 0–60 mg m⁻³.

Verification tests	Value obtained	Critical value	Conclusion
Systematic deviation
Validation of the test	0.97	≥0.97	Y
Slope	0.98	≥0.866 and ≤1.134	Y
Intercept	0.78	≥–1.98 and ≤1.98	Y
Repeatability
Standard uncertainty of SRM	1.1	≤1.2	Y
Standard uncertainty of AM	1.1	≤1.2	Y

Table 11. Summary of CEN/TS 14793 test of equivalence of TGN M22/FTIR to the European Standard Reference Methods for the Monitoring of Emissions from Stacks and Flues of H₂O, SO₂, NO, CO, and HCl.

		Repeatability		Systematic deviation
Measurand	Range (mg m^−3)	SRM	AM	Validation of the test	Slope	Intercept	Criteria met?
H2O	14%	0.42	0.42	0.995	0.987	0.306	Y
SO2	75	2.5	2.0	0.995	1.106	1.421	Y
SO2	200	2.8	2.1	0.998	1.057	2.744	Y
NO	200	1.5	2.3	1.00	1.026	2.37	Y
NO	300	2.2	3.4	1.00	0.99	4.99*	N
CO	75	0.9	0.8	1.00	1.00	3.00	Y
CO	100	1.0	1.2	1.00	0.99	3.09	Y
HCl	15	0.3	0.3	0.983	1.040	0.322	Y
HCl	60	1.1	1.1	0.97	0.98	0.78	Y

Note: *Noncompliance with test criterion.