Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 6485

e) leak and cleanliness checks substantiation (see 2.5.2). 2007/70/II. szám 11/11/93 ANNEX 16 — VOLUME II APPENDIX 3. INSTRUMENTATION AND MEASUREMENT TECHNIQUES FOR GASEOUS EMISSIONS 1. INTRODUCTION Note.— The procedures specified in this appendix are concerned with the acquisition of representative exhaust samples and their transmission to, and analysis by, the emissions measuring system. The procedures do not apply to engines employing afterburning. The methods proposed are representative of the best readily available and most established practice. Variations in the procedure contained in this appendix shall only be allowed after prior application to and approval by the certificating authority. 2. DEFINITIONS Where the following expressions are used in this appendix, they have the meanings ascribed to them below: Accuracy. The closeness with which a measurement approaches the true value established independently. Air/fuel ratio. The mass rate of airflow through the hot section of the engine divided by the mass rate of fuel flow to the engine. Calibration gas. A high accuracy reference gas to be used for alignment, adjustment and periodic checks of instruments. Concentration. The volume fraction of the component of interest in the gas mixture — expressed as volume percentage or as parts per million. Exhaust nozzle. In the exhaust emissions sampling of gas turbine engines where the jet effluxes are not mixed (as in some turbofan engines for example) the nozzle considered is that for the gas generator (core) flow only. Where, however, the jet efflux is mixed the nozzle considered is the total exit nozzle. Flame ionization detector. A hydrogen-air diffusion flame detector that produces a signal nominally proportional to the mass-flow rate of hydrocarbons entering the flame per unit of time — generally assumed responsive to the number of carbon atoms entering the flame. Interference. Instrument response due to presence of components other than the gas (or vapour) that is to be measured. Noise. Random variation in instrument output not associated with characteristics of the sample to which the instrument is responding, and distinguishable from its drift characteristics. Non-dispersive infra-red analyser. An instrument that by absorption of infra-red energy selectively measures specific components. Parts per million (ppm). The unit volume concentration of a gas per million unit volume of the gas mixture of which it is a part. Parts per million carbon (ppmC). The mole fraction of hydrocarbon multiplied by 106 measured on a methaneequivalence basis. Thus, 1 ppm of methane is indicated as 1 ppmC. To convert ppm concentration of any hydrocarbon to an equivalent ppmC value, multiply ppm concentration by the number of carbon atoms per molecule of the gas. For example, 1 ppm propane translates as 3 ppmC hydrocarbon; 1 ppm hexane as 6 ppmC hydrocarbon. Reference gas. A mixture of gases of specified and known composition used as the basis for interpreting instrument response in terms of the concentration of the gas to which the instrument is responding. Repeatability. The closeness with which a measurement upon a given, invariant sample can be reproduced in short-term repetitions of the measurement with no intervening instrument adjustment. Resolution. The smallest change in a measurement which can be detected. Response. The change in instrument output signal that occurs with change in sample concentration. Also the output signal corresponding to a given sample concentration. Stability. The closeness with which repeated measurements upon a given invariant sample can be maintained over a given period of time. Zero drift. Time-related deviation of instrument output from zero set point when it is operating on gas free of the component to be measured. Zero gas. A gas to be used in establishing the zero, or noresponse, adjustment of an instrument. 2007/70/II. szám Appendix 3 Annex 16 — Environmental Protection 11/11/93 Figure 3-1. Sampling and analysis system, schematic EXHAUST NOZZLE SAMPLE PROBE TRANSFER LINE PUM P DUM P PUM P ZERO SPAN VENT VENT VENT HC ANALYSIS CO ANALYSIS CO 2 ANALYSIS ZERO ZERO SPAN SPAN NO ANALYSIS x VENT REPRESENTS (GROUP OF) VALVE(S) TO IMPLEMENT REQUIRED ROUTE SELECTION(S) LINE TEM PERATURE CONTROLLED AT 160° C LINE TEM PERATURE CONTROLLED AT 65° C FURTHER NOTES AND DETAIL IN TEXT 2007/70/II. szám Annex 16 — Environmental Protection Volume II 11/11/93 3. DATA REQUIRED 3.1 Gaseous emissions Concentrations of the following emissions shall be determined:

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