Document ID: chunk:federal_register_of_legislation:F2012C00283:reg:3:p18
Version: federal_register_of_legislation:F2012C00283
Segment Type: reg
Provision Reference: reg 3 (pt 18/18)
Character Range: 412434–415248

taken to give a response factor of 1.00.

               The test gas to be used for oxygen interference and the recommended response factor range are given below:

               Propane and nitrogen:    0.95  Rf  1.05.

              4. Calibration of the hydrocarbon analyzer

               Each of the normally used operating ranges are calibrated by the following procedure:

              4.1. Establish the calibration curve by at least five calibration points spaced as evenly as possible over the operating range. The nominal concentration of the calibration gas with the highest concentrations to be at least 80 per cent of the full scale.

              4.2. Calculate the calibration curve by the method of least squares. If the resulting polynomial degree is greater than 3, then the number of calibration points shall be at least the number of the polynomial degree plus 2.

              4.3. The calibration curve shall not differ by more than 2 per cent from the nominal value of each calibration gas.

              4.4. Using the coefficients of the polynomial derived from paragraph 3.2. above, a table of indicated reading against true concentration shall be drawn up in steps of no greater than 1 per cent of full scale. This is to be carried out for each analyser range calibrated. The table shall also contain other relevant data such as:
               (a) Date of calibration, span and zero potentiometer readings (where  applicable);
               (b) Nominal scale;
               (c) Reference data of each calibration gas used;
               (d) The actual and indicated value of each calibration gas used together   with the percentage differences;
               (e) FID fuel and type;
               (f) FID air pressure.

              4.5. If it can be shown to the satisfaction of the technical service that alternative technology (e.g. computer, electronically controlled range switch) can give equivalent accuracy, then those alternatives may be used.

Annex 7 - Appendix 2
Diurnal ambient temperature profile for the calibration
of the enclosure and the diurnal emission test            Alternative diurnal ambient temperature profile for the calibration of the enclosure in accordance with Annex 7, Appendix 1, paragraphs 1.2. and 2.3.9.
Time (hours)                                              Temperature                                                                                                                                                            Temperature
                                                           (°Ci)                                                                                                                                                   Time (hours)   (°Ci)
Calibration                                               Test