1065.355—H2O and CO2 interference verification for CO NDIR analyzers.
(a) Scope and frequency.
If you measure CO using an NDIR analyzer, verify the amount of H2 O and CO2 interference after initial analyzer installation and after major maintenance.
(b) Measurement principles.
H2 O and CO2 can positively interfere with an NDIR analyzer by causing a response similar to CO. If the NDIR analyzer uses compensation algorithms that utilize measurements of other gases to meet this interference verification, simultaneously conduct these other measurements to test the compensation algorithms during the analyzer interference verification.
(c) System requirements.
A CO NDIR analyzer must have combined H2 O and CO2 interference that is within ±2 % of the flow-weighted mean concentration of CO expected at the standard, though we strongly recommend a lower interference that is within ±1%.
(1)
Start, operate, zero, and span the CO NDIR analyzer as you would before an emission test. If the sample is passed through a dryer during emission testing, you may run this verification test with the dryer if it meets the requirements of § 1065.342. Operate the dryer at the same conditions as you will for an emission test. You may also run this verification test without the sample dryer.
(2)
Create a humidified CO2 test gas by bubbling a CO2 span gas that meets the specifications in § 1065.750 through distilled water in a sealed vessel. If the sample is not passed through a dryer during emission testing, control the vessel temperature to generate an H2 O level at least as high as the maximum expected during emission testing. If the sample is passed through a dryer during emission testing, control the vessel temperature to generate an H2 O level at least as high as the level determined in § 1065.145(e)(2) for that dryer. Use a CO2 span gas concentration at least as high as the maximum expected during testing.
(3)
Introduce the humidified CO2 test gas into the sample system. You may introduce it downstream of any sample dryer, if one is used during testing.
(4)
If the sample is not passed through a dryer during this verification test, measure the water mole fraction, x
H2O, of the humidified CO2 test gas as close as possible to the inlet of the analyzer. For example, measure dewpoint, T
dew, and absolute pressure, p
total, to calculate x
H2O. Verify that the water content meets the requirement in paragraph (d)(2) of this section. If the sample is passed through a dryer during this verification test, you must verify that the water content of the humidified test gas downstream of the vessel meets the requirement in paragraph (d)(2) of this section based on either direct measurement of the water content (e.g., dewpoint and pressure) or an estimate based on the vessel pressure and temperature. Use good engineering judgment to estimate the water content. For example, you may use previous direct measurements of water content to verify the vessel's level of saturation.
(5)
If a sample dryer is not used in this verification test, use good engineering judgment to prevent condensation in the transfer lines, fittings, or valves from the point where x
H2O is measured to the analyzer. We recommend that you design your system so that the wall temperatures in the transfer lines, fittings, and valves from the point where x
H2O is measured to the analyzer are at least 5 °C above the local sample gas dewpoint.
(6)
Allow time for the analyzer response to stabilize. Stabilization time may include time to purge the transfer line and to account for analyzer response.
(7)
While the analyzer measures the sample's concentration, record its output for 30 seconds. Calculate the arithmetic mean of this data.
(8)
The analyzer meets the interference verification if the result of paragraph (d)(7) of this section meets the tolerance in paragraph (c) of this section.
(9)
You may also run interference procedures for CO2 and H2 O separately. If the CO2 and H2 O levels used are higher than the maximum levels expected during testing, you may scale down each observed interference value by multiplying the observed interference by the ratio of the maximum expected concentration value to the actual value used during this procedure. You may run separate interference concentrations of H2 O (down to 0.025 mol/mol H2 O content) that are lower than the maximum levels expected during testing, but you must scale up the observed H2 O interference by multiplying the observed interference by the ratio of the maximum expected H2 O concentration value to the actual value used during this procedure. The sum of the two scaled interference values must meet the tolerance in paragraph (c) of this section.
(1)
You may omit this verification if you can show by engineering analysis that for your CO sampling system and your emission-calculation procedures, the combined CO2 and H2 O interference for your CO NDIR analyzer always affects your brake-specific CO emission results within ±0.5% of the applicable CO standard.
(2)
You may use a CO NDIR analyzer that you determine does not meet this verification, as long as you try to correct the problem and the measurement deficiency does not adversely affect your ability to show that engines comply with all applicable emission standards.