Document ID: chunk:federal_register_of_legislation:F2008C00323:reg:3:p18
Version: federal_register_of_legislation:F2008C00323
Segment Type: reg
Provision Reference: reg 3 (pt 18/18)
Character Range: 347801–349795

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

                                      Alternative diurnal ambient
Diurnal ambient temperature profile   temperature profile for the
for the calibration of the enclosure  calibration of the enclosure
and the diurnal emission test         in accordance with Annex 7,
                                      Appendix 1, paragraphs 1.2.
                                      and 2.3.9.

Time (hours)  Temperature  Time (hours)  Temperature
              (Ci)                      (Ci)

Calibration   Test