| Performance parameter |
Units1 | SO2 | O3 | CO | NO2 (Std. range) |
Definitions and test procedures |
|||
|---|---|---|---|---|---|---|---|---|---|
| Std. range3 | Lower range2 3 | Std. range3 | Lower range2 3 | Std. range3 | Lower range2 3 | ||||
| 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) | ||
| Percent5 | 2 | 2 | 2 | 2 | 1.0 | 1.0 | 4 | Sec. 53.23(e) | |
| 80% of upper range limit | - | - | - | - | - | - | Sec. 53.23(e) | ||
| Percent5 | 2 | 2 | 2 | 2 | 1.0 | 1.0 | 6 | Sec. 53.23(e) Sec. 53.23(e) |
|
1To convert from parts per million (ppm) to µg/m3 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.
2Tests 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.
3For 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.
4For nitric oxide interference for the SO2 UVF method, interference equivalent is ±0.0003 ppm for the lower range.
5Standard deviation expressed as percent of the URL.
[80 FR 65460, Oct. 26, 2015]
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