Code of Federal Regulations > Title 40 > Chapter I > Part 53 > Subpart B > Appendix - Table B-1 to Subpart B of Part 53—Performance Limit Specifications for Automated Methods

Regulations last checked for updates: Nov 26, 2024

Title 40 - Protection of Environment last revised: Nov 22, 2024

Appendix - Table B-1 to Subpart B of Part 53—Performance Limit Specifications for Automated Methods

Performance parameter	Units ¹	SO2		O3		CO		NO2 (Std. range)	Definitions and test procedures
Performance parameter	Units ¹	Std. range ³	Lower range 2 3	Std. range ³	Lower range 2 3	Std. range ³	Lower range 2 3	NO2 (Std. range)	Definitions and test procedures
1. Range	ppm	0-0.5	<0.5	0-0.5	<0.5	0-50	<50	0-0.5	Sec. 53.23(a)
2. Noise	ppm	0.001	0.0005	0.0025	0.001	0.2	0.1	0.005	Sec. 53.23(b)
3. Lower detectable limit	ppm	0.002	0.001	0.005	0.002	0.4	0.2	0.010	Sec. 53.23(c)
4. Interference equivalent
Each interferent	ppm	±0.005	⁴ ±0.005	±0.005	±0.005	±1.0	±0.5	±0.02	Sec. 53.23(d)
Total, all interferents	ppm	-	-	-	-	-	-	0.04	Sec. 53.23(d)
5. Zero drift, 12 and 24 hour	ppm	±0.004	±0.002	±0.004	±0.002	±0.5	±0.3	±0.02	Sec. 53.23(e)
6. Span drift, 24 hour
20% of upper range limit	Percent	-	-	-	-	-	-	±20.0	Sec. 53.23(e)
80% of upper range limit	Percent	±3.0	±3.0	±3.0	±3.0	±2.0	±2.0	±5.0	Sec. 53.23(e)
7. Lag time	Minutes	2	2	2	2	2.0	2.0	20	Sec. 53.23(e)
8. Rise time	Minutes	2	2	2	2	2.0	2.0	15	Sec. 53.23(e)
9. Fall time	Minutes	2	2	2	2	2.0	2.0	15	Sec. 53.23(e)
10. Precision
20% of upper range limit		-	-	-	-	-	-		Sec. 53.23(e)
	Percent ⁵	2	2	2	2	1.0	1.0	4	Sec. 53.23(e)
80% of upper range limit		-	-	-	-	-	-		Sec. 53.23(e)
	Percent ⁵	2	2	2	2	1.0	1.0	6	Sec. 53.23(e) Sec. 53.23(e)

¹ To convert from parts per million (ppm) to µg/m ³ at 25 °C and 760 mm Hg, multiply by M/0.02447, where M is the molecular weight of the gas. Percent means percent of the upper measurement range limit.

² Tests for interference equivalent and lag time do not need to be repeated for any lower range provided the test for the standard range shows that the lower range specification (if applicable) is met for each of these test parameters.

³ For candidate analyzers having automatic or adaptive time constants or smoothing filters, describe their functional nature, and describe and conduct suitable tests to demonstrate their function aspects and verify that performances for calibration, noise, lag, rise, fall times, and precision are within specifications under all applicable conditions. For candidate analyzers with operator-selectable time constants or smoothing filters, conduct calibration, noise, lag, rise, fall times, and precision tests at the highest and lowest settings that are to be included in the FRM or FEM designation.

⁴ For nitric oxide interference for the SO2 ultraviolet fluorescence (UVF) method, interference equivalent is ±0.003 ppm for the lower range.

⁵ Standard deviation expressed as percent of the URL.

[80 FR 65460, Oct. 26, 2015, as amended at 89 FR 16383, Mar. 6, 2024]

authority: Sec. 301(a) of the Clean Air Act (42 U.S.C. sec. 1857g(a)), as amended by sec. 15(c)(2) of Pub. L. 91-604, 84 Stat. 1713, unless otherwise noted

source: 40 FR 7049, Feb. 18, 1975, unless otherwise noted.