Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 6642

(6), (8) and (9), when interference effects require to be corrected, 2.6 The option to measure CO2 and CO concentrations on a dry or partially dry sample basis, that is, with a sample humidity reduced to hd, requires the use of modified conditional equations as follows: and [CO]d (PT – P4) (1 + hd) = P5 However, the CO analyser may also be subject to interference effects as described in 2.5 above and so the complete alternative CO measurement concentration equation becomes [CO]md (PT – P4) (1 + hd) 3. ANALYTICAL FORMULATIONS 3.1 General Equations (1) to (10) can be reduced to yield the analytical formulations for the EI and AFR parameters, as given in 7.1 to this appendix. This reduction is a process of progressive elimination of the roots P0, P1 through P8, PT, making the assumptions that all concentration measurements are of the “wet” sample and do not require interference corrections or the like. In practice the option is often chosen to make the CO2 and CO concentration measurements on a “dry” or “semi-dry” basis; also it is often found necessary to make interference corrections. Formulations for use in these various circumstances are given in 3.2, 3.3 and 3.4 below. 3.2 Equation for conversion of dry concentration measurements to wet basis Concentration wet = K × concentration dry; that is, [ ] = K [ ]d The following expression for K applies when CO and CO2 are determined on a “dry” basis: 3.3 Interference corrections The measurements of CO and/or NOx and NO may require corrections for interference by the sample CO2 and water concentrations before use in the above analytical equations. Such corrections can normally be expressed in the following general ways: [CO] = [CO]m + L[CO2] + M[H2O] [CO]d = [CO]md + L[CO2]d + M [NO] = [NO]m (1 + L′[CO2] + M′[H2O]) η[NO2] = ([NOx]cm – [NO]m) (1 + L′[CO2] + M′[H2O]) 3.4 Equation for estimation of sample water content Water concentration in sample where and It should be noted that this estimate is a function of the various analyses concentration readings, which may them- K = {4 + (n/m) T + (n/mT – 2h) ([NO2] – (2[HC]/x)) (2 + h) {2 + (n/m) (1 + hd) ([CO2]d + [CO]d)} + (2 + h) (y/x–n/m) [HC]} (1 + hd) – (n/mΤ – 2h) (1 –1 + hd[CO]d) [H2O] = (|n/2m| + h|P0/m|) ([CO2] + [CO] + [HC]) – (y/2x) [HC] 1 + T(P0/m) P0/m = 2Z – (n/m) 4(1 + h – |TZ/2|) Z = 2 – [CO] – (|2/x| – |y/2x|) [HC] + [NO2] [CO2] + [CO] + [HC] hd hd + --------------     2007/70/II. szám Appendix 5 Annex 16 — Environmental Protection 11/11/93 selves require water interference correction. For better accuracy an iterative procedure is required in these cases with successive recalculation of the water concentration until the requisite stability is obtained. The use of the alternative, numerical solution methodology (4) avoids this difficulty. 4. ALTERNATIVE METHODOLOGY — NUMERICAL SOLUTION 4.1 As an alternative to the analytical procedures summarized in 3 above, it is possible to obtain readily the emissions indices, fuel/air ratio, corrected wet concentrations, etc., by a numerical solution of equations (1) to (10) for each set of measurements, using a digital computer. 4.2 In the equation set (1) to (10) the actual concentration measurements are substituted using whichever of the alternative equations (5A), (6A), etc. applies for the particular measuring system, to take account of interference corrections and/or dried sample measurements. 4.3 Suitable simple two-dimensional array equationsolving computer programmes are widely available and their use for this purpose is convenient and flexible, allowing ready incorporation and identification of any sample drying options and interference or other corrections. ATTACHMENT F TO APPENDIX 5. SPECIFICATIONS FOR ADDITIONAL DATA As required in 3.2 of Appendix 5, in addition to the measured sample constituent concentrations, the following data shall also be provided:

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