Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p60
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 60/108)
Character Range: 1055827–1058938

5.3. Analyser zero and calibration verification procedure
              5.3.1. Each normally used operating range shall be checked prior to each analysis in accordance with paragraphs 5.3.1.1. and 5.3.1.2. of this annex
              5.3.1.1. The calibration shall be checked by use of a zero gas and by use of a calibration gas according to paragraph 2.14.2.3. of Annex B6.
              5.3.1.2. After testing, zero gas and the same calibration gas shall be used for re-checking according to paragraph 2.14.2.4. of Annex B6.
              5.4. FID hydrocarbon response check procedure
              5.4.1. Detector response optimization
              The FID shall be adjusted as specified by the instrument manufacturer. Propane in air shall be used on the most common operating range.
              5.4.2. Calibration of the HC analyser
              5.4.2.1. The analyser shall be calibrated using propane in air and purified synthetic air.
              5.4.2.2. A calibration curve as described in paragraph 5.2.2. of this annex shall be established.
              5.4.3. Response factors of different hydrocarbons and recommended limits
              5.4.3.1. The response factor, Rf, for a particular hydrocarbon compound is the ratio of the FID C1 reading to the gas cylinder concentration, expressed as ppm C1.
              The concentration of the test gas shall be at a level to give a response of approximately 80 per cent of full-scale deflection for the operating range. The concentration shall be known to an accuracy of ±2 per cent in reference to a gravimetric standard expressed in volume. In addition, the gas cylinder shall be preconditioned for 24 hours at a temperature between 20 and 30 °C.
              5.4.3.2. The methane factor RfCH4 shall be measured and determined when introducing an analyser into service, and yearly thereafter or after major maintenance intervals, whichever comes first.
              The propylene response factor RfC3H6 and the toluene response factor RfC7H8 shall be measured when introducing an analyser into service. It is recommended that they be measured at or after major maintenance which might possibly affect the response factors.
              The test gases to be used and the recommended response factors are:
              Methane and purified air: 0.95 < RfCH4 < 1.15
              or 1.00 < Rf < 1.05 for NG/biomethane fuelled vehicles
              Propylene and purified air: 0.85 < RfC3H6 < 1.10
              Toluene and purified air: 0.85 < RfC7H8 < 1.10
              The factors are relative to an  of 1.00 for propane and purified air.
              5.5. NOx converter efficiency test procedure
              5.5.1. Using the test set up as shown in Figure A5/15 and the procedure described below, the efficiency of converters for the conversion of NO2 into NO shall be tested by means of an ozonator as follows:
              5.5.1.1. The analyser shall be calibrated in the most common operating range following the manufacturer's specifications using zero and calibration gas (the NO content of which shall amount to approximately