Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 6559

j) Converter: this shall be designed and operated in such a matter as to reduce NO2 present in the sample to NO. The converter shall not affect the NO originally in the sample. The converter efficiency shall not be less than 90 per cent. This efficiency value shall be used to correct the measured sample NO2 value (i.e. [NOx]c – [NO]) to that which would have been obtained if the efficiency had not been 100 per cent. ATTACHMENT D TO APPENDIX 3. CALIBRATION AND TEST GASES Table of calibration gases Analyser Gas Accuracy* HC propane in zero air ±2 per cent or ±0.05 ppm** CO2 CO2 in zero air ±2 per cent or ±100 ppm** CO CO in zero air ±2 per cent or ±2 ppm** NOx NOx in zero nitrogen ±2 per cent or ±1 ppm** * Taken over the 95 per cent confidence interval. ** Whichever is greater. The above gases are required to carry out the routine calibration of analysers during normal operational use. 2007/70/II. szám Appendix 3 Annex 16 — Environmental Protection 20/3/97 No. 3 Table of test gases Carbon monoxide and carbon dioxide calibration gases may be blended singly or as dual component mixtures. Three component mixtures of carbon monoxide, carbon dioxide and propane in zero air may be used, provided the stability of the mixture is assured. Zero gas as specified for the CO, CO2 and HC analysers shall be zero air (which includes “artificial” air with 20 to 22 per cent O2 blended with N2). For the NOx analyser zero nitrogen shall be used as the zero gas. Impurities in both kinds of zero gas shall be restricted to be less than the following concentrations: 1 ppm C 1 ppm CO 100 ppm CO2 1 ppm NOx The applicant shall ensure that commercial gases supplied to him do in fact meet this specification, or are so specified by the vendor. Analyser Gas Accuracy* HC propane in 10 ±1 per cent O2 balance zero nitrogen ±1 per cent HC propane in 21 ±1 per cent O2 balance zero nitrogen ±1 per cent HC propylene in zero air ±1 per cent HC toluene in zero air ±1 per cent HC n-hexane in zero air ±1 per cent HC propane in zero air ±1 per cent CO2 CO2 in zero air ±1 per cent CO2 CO2 in zero nitrogen ±1 per cent CO CO in zero air ±1 per cent NOx NO in zero nitrogen ±1 per cent * Taken over the 95 per cent confidence interval. The above gases are required to carry out the tests of Attachments A, B and C. 30A 2007/70/II. szám Annex 16 — Environmental Protection Volume II 20/3/97 No. 3 THIS PAGE INTENTIONALLY LEFT BLANK 30B 2007/70/II. szám Appendix 3 Annex 16 — Environmental Protection 20/3/97 No. 3 ATTACHMENT E TO APPENDIX 3. THE CALCULATION OF THE EMISSIONS PARAMETERS — BASIS, MEASUREMENT CORRECTIONS AND ALTERNATIVE NUMERICAL METHOD 1. SYMBOLS AFR air/fuel ratio, the ratio of the mass flow rate of dry air to that of the fuel EI emission index; 103 × mass flow rate of gaseous emission product in exhaust per unit mass flow rate of fuel K ratio of concentration measured wet to that measured dry (after cold trap) L, L′ analyser interference coefficient for interference by CO2 M, M′ analyser interference coefficient for interference by H2O MAIR molecular mass of dry air = 28.966 g or, where appropriate, = (32 R + 28.156 4 S + 44.011 T) g MCO molecular mass of CO = 28.011 g MHC molecular mass of exhaust hydrocarbon, taken as CH4 = 16.043 g MNO2 molecular mass of NO2 = 46.008 g MC atomic mass of carbon = 12.011 g MH atomic mass of hydrogen = 1.008 g P1 number of moles of CO2 in the exhaust sample per mole of fuel P2 number of moles of N2 in the exhaust sample per mole of fuel P3 number of moles of O2 in the exhaust sample per mole of fuel P4 number of moles of H2O in the exhaust sample per mole of fuel P5 number of moles of CO in the exhaust sample per mole of fuel P6 number of moles of CxHy in the exhaust sample per mole of fuel P7 number of moles of NO2 in the exhaust sample per mole of fuel P8 number of moles of NO in the exhaust sample per mole of fuel PT P1 + P2 + P3 + P4 + P5 + P6 + P7 + P8 R concentration of O2 in dry air, by volume = 0.2095 normally S concentration of N2 + rare gases in dry air, by volume = 0.7902 normally T concentration of CO2 in dry air, by volume = 0.0003 normally P0 number of moles of air per mole of fuel in initial air/fuel mixture Z symbol used and defined in 3.4 [CO2] mean concentration of CO2 in exhaust sample, vol/vol [CO] mean concentration of CO in exhaust sample, vol/vol [HC] mean concentration of HC in exhaust sample, vol C/vol [NO] mean concentration of NO in exhaust sample, vol/vol [NO2] mean concentration of NO2 in exhaust sample, vol/vol [NOx] mean concentration of NO and NO2 in exhaust sample, vol/vol [NOx]c mean concentration of NO in exhaust sample, after passing through the NO2/NO converter, vol/vol [NO2] mean = [ ]d mean concentration in exhaust sample after cold trap, vol/vol [ ]m mean concentration measurement indicated before instrument correction applied, vol/vol NOx [ ]c NO [ ] – ( ) η ------------------------------------------ 11/11/93 2007/70/II. szám Annex 16 — Environmental Protection Volume II 20/3/97 No. 3 h humidity of ambient air, vol water/vol dry air hd humidity of exhaust sample leaving “drier” or “cold trap”, vol water/vol dry sample m number of C atoms in characteristic fuel molecule n number of H atoms in characteristic fuel molecule x number of C atoms in characteristic exhaust hydrocarbon molecule y number of H atoms in characteristic exhaust hydrocarbon molecule η efficiency of NO2/NO converter 2. BASIS OF CALCULATION OF EI AND AFR PARAMETERS 2.1 It is assumed that the balance between the original fuel and air mixture and the resultant state of the exhaust emissions as sampled can be represented by the following equation: CmHn + P0[R(O2) + S(N2) + T(CO2) + h(H2O)] = P1(CO2) + P2(N2) + P3(O2) + P4(H2O) + P5(CO) + P6(CxHy) + P7(NO2) + P8(NO) from which the required parameters can, by definition, be expressed as EI(CO) = P5 EI(HC) = xP6 expressed as methane equivalent EI(NOx) = (P7 + P8) expressed as NO2 equivalent AFR = P0 2.2 Values for fuel hydrocarbon composition (m, n) are assigned by fuel specification or analysis. If only the ratio n/m is so determined, the value m = 12 may be assigned. The mole fractions of the dry air constituents (R, S, T) are normally taken to be the recommended standard values but alternative values may be assigned, subject to the restriction R + S + T = 1 and the approval of the certificating authority. 2.3 The ambient air humidity, h, is as measured at each test condition. It is recommended that, in the absence of contrary evidence as to the characterization (x, y) of the exhaust hydrocarbon, values of x = 1 and y = 4 are assigned. 2.4 Determination of the remaining unknowns requires the solution of the following set of linear simultaneous equations, where (1) to (4) derive from the fundamental atomic conservation relationships and (5) to (9) represent the gaseous product concentration relationships. (2R + 2T + h)P0 The above set of conditional equations is for the case where all measured concentrations are true ones, that is, not subject to interference effects or to the need to correct for sample drying. In practice, interference effects are usually present to a significant degree in the CO, and NO measurements, and the option to measure CO2 and CO on a dry or partially dry basis is often used. The necessary modifications to the relevant equations are described in 2.5 and 2.6. 2.5 The interference effects are mainly caused by the presence of CO2 and H2O in the sample which can affect the CO and the NOx analysers in basically different ways. The CO analyser is prone to a zero-shifting effect and the NOx analyser to a sensitivity change, represented thus: [CO] = [CO]m + L[CO2] + M[H2O] and [NOx]c = [NOx]cm (1 + L′[CO2] + M′[H2O]) 103MCO mMC nMH + ------------------------------       103MHC mMC nMH + ------------------------------       103MNO2 mMC nMH + ------------------------------       MAIR mMC nMH + ------------------------------     11/11/93 2007/70/II. szám Appendix 3 Annex 16 — Environmental Protection 20/3/97 No. 3 which transform into the following alternative equations to (6),

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