Примеры использования Sample dryer на Английском языке и их переводы на Русский язык
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Official
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Colloquial
Sample dryers.
Iii The humidified gas shall be introduced upstream of the sample dryer;
Sample dryer.
The dew point, Tdew, and absolute pressure, ptotal, downstream of a sample dryer shall be monitored.
Sample dryer verification.
It may be introduced upstream or downstream of a sample dryer that is used during emission testing.
Sample dryer efficiency.
Liquid water remaining in an improperly designed sample dryer can remove NO2 from the sample. .
Sample dryer NO2 penetration.
The NDUV temperature shall be maintained to prevent aqueous condensation, unless a sample dryer is installed upstream of the NO2/NO converter, if used, or upstream of the analyzer.
Sample dryer NO2 penetration.
The dew point generator's output shall be sampled through the sampling system and sample dryer for at least 10 minutes until the sample dryer is expected to be removing a constant rate of water.
B Sample dryer optional for NO measurement.
For dry CLD analyzers,it shall be demonstrated that for the highest expected water vapour concentration Hm(see paragraph 9.3.9.2.2.), the sample dryer maintains CLD humidity at<= 5 g water/kg dry air(or about 0.008 per cent H2O), which is 100 per cent relative humidity at 3.9 °C and 101.3 kPa.
B Sample dryer optional for NO measurement.
If the humidified NO span gas sample does not pass through a sample dryer, the quench verification calculations in paragraph 8.1.11.2.3. scale the measured H2O quench to the highest mole fraction of H2O expected during emission testing.
The sample dryer shall allow for measuring at least 95 per cent of the total NO2 at the maximum expected concentration of NO2.
If the humidified NO span gas is introduced into the sample system upstream of a sample dryer during the verification test, it is not needed to estimate the maximum expected mole fraction of water and xH2Oexp shall be set equal to xH2Omeas.
If a sample dryer is used without an NO2/NO converter upstream, it could therefore remove NO2 from the sample prior to NOx measurement.
If a humidity sensor for continuous monitoring of dew point at the sample dryer outlet is used this check does not apply, as long as it is ensured that the dryer outlet humidity is below the minimum values used for quench, interference, and compensation checks.
If a sample dryer is used as allowed in paragraph 9.3.2.3.1. to remove water from the sample gas, the performance shall be verified upon installation, after major maintenance, for thermal chiller.
If the humidified NO span gas sample does not pass through a sample dryer for this verification test, the vessel temperature shall be controlled to generate an H2O level approximately equal to the maximum mole fraction of H2O expected during emission testing.
The sample dryer shall meet the specifications as determined in paragraph 9.3.2.3.1. for dew point, Tdew, and absolute pressure, ptotal, downstream of the osmotic-membrane dryer or thermal chiller;
Upstream of any sample dryer, if used during testing, the engine exhaust shall be introduced into the NDUV analyzer.
In case a sample dryer is used, the mole fraction of H2O in the humidified NO span gas shall be measured downstream of the sample dryer, xH2Omeas. It is recommended to measure xH2Omeas as close as possible to the CLD analyzer inlet. xH2Omeas may be calculated from measurements of dew point, Tdew, and absolute pressure, ptotal.
Upstream of any sample dryer, if one is used during testing, the engine exhaust shall be introduced into the NDUV analyser;
Vii The sample dryer meets the verification if the result of paragraph(d)(6) of this paragraph is less than the dew point corresponding to the sample dryer specifications as determined in paragraph 9.3.2.3.1. plus 2 °C or if the mol fraction from(d)(6)is less than the corresponding sample dryer specifications plus 0.002 mol/mol or 0.2 Vol per cent.
Either type of sample dryer described in this paragraph to decrease the effects of water on gaseous emission measurements may be used.
If the system uses a sample dryer during testing that has passed the sample dryer verification check,the humidified gas mixture may be introduced downstream of the sample dryer by bubbling it through distilled water in a sealed vessel at(25+- 10 °C), or a temperature greater than the dew point.
If the system does not use a sample dryer to remove water from the sample gas, the span gas shall be humidified by flowing the gas mixture through a sealed vessel that humidifies the gas to the highest sample dew point that is estimated during emission sampling by bubbling it through distilled water.