Betekenis van:
proportional sampling

Voorbeeldzinnen

1. Verification of proportional sampling
2. A sampling critical-flow venturi (SV), to take proportional samples of the diluted exhaust gas at sampling probe S2;
3. Sampling shall be stratified by slaughterhouses that participate and proportional to slaughterhouse capacity.
4. The proportional sample is achieved by sampling with pump, flow-meter and flow control valve at a constant flow rate.
5. A heat exchanger HE or electronic flow compensation EFC may be used for proportional particulate sampling and for flow determination.
6. For bag sampling and particulate sampling, a proportional sample shall be taken from the diluted exhaust gas of the CVS system.
7. A bag sampling system may be used to collect a proportional sample of the air withdrawn from and admitted to the enclosure.
8. The concentration of CO, CO2, and NMHC may be determined by integration of the analyser signal or by bag sampling. For particulates, a proportional sample must be collected on suitable filters.
9. The isokinetic sampling probe must be installed facing upstream on the exhaust pipe centre-line where the flow conditions in section EP are met, and designed to provide a proportional sample of the raw exhaust gas.
10. The isokinetic sampling probe must be installed facing upstream on the exhaust pipe centreline where the flow conditions in paragraph EP are met, and designed to provide a proportional sample of the raw exhaust gas.
11. The isokinetic sampling probe must be installed facing upstream on the exhaust pipe centreline where the flow conditions in section EP are met, and designed to provide a proportional sample of the raw exhaust gas.
12. The equipment shall be capable of measuring the mass of hydrocarbon in the inlet and outlet flow streams with a resolution of 0,01 gram. A bag sampling system may be used to collect a proportional sample of the air withdrawn from and admitted to the enclosure.
13. If flow compensation (i.e. proportional control of sample flow) is used, it must be demonstrated that the ratio of main tunnel flow to particulate sample flow does not change by more than ± 5 % of its set value (except for the first 10 seconds of sampling).
14. If flow compensation (i.e., proportional control of sample flow) is used, it must be demonstrated that the ratio of main tunnel flow to particulate sample flow does not change by more than ± 5 % of its set value (except for the first 10 seconds of sampling).
15. As both pressure and temperature are equal at the two venturi inlets the volume of the gas flow diverted for sampling is proportional to the total volume of diluted exhaust-gas mixture produced, and thus the requirements of this annex are met.