Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p31
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 31/56)
Character Range: 382311–385406

shall be available for operation:
a) For raw exhaust gas
                   Purified nitrogen
 (Contamination  1 ppm C1,  1 ppm CO,   400 ppm CO2,
 0.1 ppm NO)
                   Purified oxygen
                  (Purity  99.5 per cent vol O2)

                   Hydrogen-helium mixture (FID burner fuel)
                   (40 ± 1 per cent hydrogen, balance helium)
                   (Contamination  1 ppm C1,  400 ppm CO2)

                   Purified synthetic air
                   (Contamination  1 ppm C1,  1 ppm CO,  400 ppm CO2,
                   0.1 ppm NO)
                   (Oxygen content between 18-21 per cent vol.)

                  b) For dilute exhaust gas (optionally for raw exhaust gas)

                   Purified nitrogen
                   (Contamination  0.05 ppm C1,   1 ppm CO,   10 ppm CO2,
                   0.02 ppm NO)

                   Purified oxygen
                   (Purity  99.5 per cent vol O2)

                   Hydrogen-helium mixture (FID burner fuel)
                   (40 ± 1 per cent hydrogen, balance helium)
                   (Contamination  0.05 ppm C1,  10 ppm CO2)

                   Purified synthetic air
                   (Contamination  0.05 ppm C1,   1 ppm CO,   10 ppm CO2,
                   0.02 ppm NO)
                   (Oxygen content between 20.5 - 21.5 per cent vol.)
 If gas bottles are not available, a gas purifier may be used, if contamination levels can be demonstrated.
9.3.3.2. Calibration and span gases
 Mixtures of gases having the following chemical compositions shall be available, if applicable. Other gas combinations are allowed provided the gases do not react with one another. The expiration date of the calibration gases stated by the manufacturer shall be recorded.
 C3H8 and purified synthetic air (see paragraph 9.3.3.1.);
 CO and purified nitrogen;
 NO and purified nitrogen;
 NO2 and purified synthetic air;
 CO2 and purified nitrogen;
 CH4 and purified synthetic air;
 C2H6 and purified synthetic air.
 The true concentration of a calibration and span gas shall be within ±1 per cent of the nominal value, and shall be traceable to national or international standards. All concentrations of calibration gas shall be given on a volume basis (volume per cent or volume ppm).
9.3.3.3. Gas dividers
 The gases used for calibration and span may also be obtained by means of gas dividers (precision blending devices), diluting with purified N2 or with purified synthetic air. The accuracy of the gas divider shall be such that the concentration of the blended calibration gases is accurate to within ±2 per cent. This accuracy implies that primary gases used for blending shall be known to an accuracy of at least 1 per cent, traceable to national or international gas standards. The verification shall be performed at between 15 and 50 per cent of full scale for each calibration incorporating a gas divider. An additional verification may be performed using another calibration gas, if the first verification has failed.
 Optionally, the blending device may be checked with