Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 6578

d) The minimum number of sampling points shall be equal to 11. The measurement plane, located at a distance X from the engine shall be divided into three sections demarcated by circles centred around the exhaust stream axis with radii R1 = 0.05X R2 = 0.09X and a minimum of 3 samples shall be taken from each section. The difference between the number of samples in each section must be less than 3. The sample taken at the most remote distance from the axis shall be from a point located at a radius of between 0.11X and 0.16X. 5.1.2 Sampling lines The sample shall be transferred from the probe to the analysers via a line of 4.0 to 8.5 mm inside diameter, taking the shortest route practicable and using a flow rate such that the transport time is less than 10 seconds. The line shall be maintained at a temperature of 160°C ±15°C (with a stability of ±10°C). When sampling to measure HC, CO, CO2 and NOx components, the line shall be constructed in stainless steel or carbon-loaded grounded PTFE. 5.2 HC analyser The measurement of total hydrocarbon sample content shall be made by an analyser using the heated flame ionization detector (FID), between the electrodes of which passes an ionization current proportional to the mass rate of hydrocarbon entering a hydrogen flame. The analyser shall be deemed to include components arranged to control temperature and flow rates of sample, sample bypass, fuel and diluent gases, and to enable effective span and zero calibration checks. Note.— An over-all specification is given in Attachment A to this appendix. 5.3 CO and CO2 analysers Non-dispersive infra-red analysers shall be used for the measurement of these components, and shall be of the design which utilizes differential energy absorption in parallel reference and sample gas cells, the cell or group of cells for each of these gas constituents being sensitized appropriately. This analysis sub-system shall include all necessary functions for the control and handling of sample, zero and span gas flows. Temperature control shall be that appropriate to whichever basis of measurement, wet or dry, is chosen. Note.— An over-all specification is given in Attachment B to this appendix. 5.4 NOx analyser The measurement of NO concentration shall be by the chemiluminescent method in which the measure of the radiation intensity emitted during the reaction of the NO in the sample with added O3 is the measure of the NO concentration. The NO2 component shall be converted to NO in a converter of the requisite efficiency prior to measurement. The resultant NOx measurement system shall include all necessary flow, temperature and other controls and provide for routine zero and span calibration as well as for converter efficiency checks. Note.— An over-all specification is given in Attachment C to this appendix. 6. GENERAL TEST PROCEDURES 6.1 Engine operation The engine shall be operated on an open air static test facility which is suitable and properly equipped for high accuracy performance testing, and which conforms to the requirements for sampling probe installation as specified in 5.1. The emissions tests shall be made at the power settings prescribed by the certificating authority. The engine shall be stabilized at each setting. 6.2 Ambient air conditions 6.2.1 A check shall be made on the ambient concentrations of CO, HC, CO2 and NOx , with the engine under test running at the test condition. Unusually high concentrations indicate abnormal conditions such as exhaust gas recirculation, fuel spillage or some other source of unwanted emissions in the test area and such situations shall be rectified or avoided as appropriate. Note.— For guidance, the normal ambient concentration of CO2 is 0.03 per cent, and ambient concentration levels for CO and HC of 5 ppm and NOx of 0.5 ppm are unlikely to be exceeded under normal conditions. 6.2.2 Extreme climatic conditions, such a those involving precipitation or excessive wind speed shall also be avoided. 6.3 Major instrument calibration Note.— The general objective of this calibration is to confirm stability and linearity. 6.3.1 The applicant shall satisfy the certificating authority that the calibration of the analytical system is valid at the time of the test. 2007/70/II. szám Appendix 5 Annex 16 — Environmental Protection 11/11/93 6.3.2 For the hydrocarbon analyser this calibration shall include checks that the detector oxygen and differential hydrocarbon responses are within the limits specified in Attachment A to this appendix. The efficiency of the NO2/NO converter shall also be checked and verified to meet the requirements in Attachment C to this appendix. 6.3.3 The procedure for checking the performance of each analyser shall be as follows (using the calibration and test gases as specified in Attachment D to this appendix):

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