Division 3.4.2 Procedures that require chemical balances

Chemical balances are required to determine the following:

1. (a)

   The amount of water in a raw or diluted exhaust gas flow, x _H2Oexh, when the amount of water to correct for the amount of water removed by a sampling system is not measured;

2. (b)

   The flow-weighted mean fraction of dilution air in diluted exhaust gas, x _dil/exh, when dilution air flow is not measured to correct for background emissions. It has to be noted that if chemical balances are used for this purpose, the exhaust gas is assumed to be stoichiometric, even if it is not.