Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:10:p26
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 10 (pt 26/30)
Character Range: 592526–595358

replaced by the following:

        '3.  DETERMINATION OF THE GASEOUS COMPONENTS

        3.1.  General analyser specifications

              The analysers shall have a measuring range appropriate for the accuracy required to measure the concentrations of the exhaust gas components (section 3.1.1). It is recommended that the analysers be operated such that the measured concentration falls between 15 % and 100 % of full scale.

              If read-out systems (computers, data loggers) can provide sufficient accuracy and resolution below 15 % of full scale, measure- ments below 15 % of full scale are also acceptable. In this case, additional calibrations of at least 4 non-zero nominally equally spaced points are to be made to ensure the accuracy of the calibration curves according to section 1.6.4 of Appendix 5 to this Annex.

              The electromagnetic compatibility (EMC) of the equipment shall be on a level as to minimise additional errors.

        3.1.1 Accuracy

              The analyser shall not deviate from the nominal calibration point by more than ± 2 % of the reading over the whole measurement range except zero, or ± 0,3 % of full scale whichever is larger. The accuracy shall be determined according to the calibration requirements laid down in section 1.6 of Appendix 5 to this Annex.

              Note: For the purpose of this Directive, accuracy is defined as the deviation of the analyser reading from the nominal calibration values using a calibration gas (= true value).

        3.1.2. Precision

              The precision, defined as 2,5 times the standard deviation of 10 repetitive responses to a given calibration or span gas, has to be not greater than ± 1 % of full scale concentration for each range used above 155 ppm (or ppmC) or ± 2 % of each range used below 155 ppm (or ppmC).

        3.1.3. Noise

              The analyser peak-to-peak response to zero and calibration or span gases over any 10 second period shall not exceed 2 % of full scale on all ranges used.

        3.1.4. Zero drift

              Zero response is defined as the mean response, including noise, to a zero gas during a 30 seconds time interval. The drift of the zero response during a one hour period shall be less than 2 % of full scale on the lowest range used.

        3.1.5. Span drift

              Span response is defined as the mean response, including noise, to a span gas during a 30 seconds time interval. The drift of the span response during a one hour period shall be less than 2 % of full scale on the lowest range used.

        3.1.6. Rise time

              The rise time of the analyser installed in the measurement system shall not exceed 3,5 s.

              Note: Only evaluating the response time of the analyser alone will not clearly define the suitability of the