BS ISO 8178-1:2020 pdf free.Reciprocating internal combustion engines -Exhaust emission measurement.
The emission of gaseous and particulate components by the engine submitted for testing shall be measured by the methods described in Clauses 6 to 8. These clauses describe the engine and ambient related measurement systems (Clause 6), the analytical systems for the gaseous emissions (Clause 7) and the particulate sampling systems (Clause 8). The system calibration procedures are described in Clause 9. Test cycles and emissions calculations are not part of this document. They are included in ISO 8178-4. Other systems or analysers may be accepted if they yield equivalent results. The determination of system equivalency shall be based on a seven-sample pair [or larger) correlation study between the system under consideration and one of the accepted systems of this document. “Results”refers to the specific cycle weighted emissions value. The correlation testing is to be performed at the same laboratory, test cell, and on the same engine. The tests should be run concurrently. The test cycle to be used shall be the appropriate cycle as found in ISO 8178-4. The equivalency of the sample pair averages shall be determined by F-test and t-test statistics (see Annex D), with outliers excluded, obtained under the laboratory cell and the engine conditions described above. The systems to be used for correlation testing shall be declared prior to the test and shall be agreed upon by the parties involved. For introduction of a new system into this document, the determination of equivalency shall be based upon the calculation of repeatability and reproducibility, as described in ISO 5725-2.In batch sampling, a sample of raw or dilute exhaust is continuously extracted and stored for later measurement. The extracted sample shall be proportional to the raw or dilute exhaust flow rate. Examples of batch sampling are collecting diluted gaseous emissions in a bag and collecting PM on a filter. In principal the method of emission calculation is done as follows: the batch sampled concentrations are multiplied by the total mass or mass flow (raw or dilute) from which it was extracted during the test cycle. This product is the total mass or mass flow of the emitted constituent. To calculate the PM concentration, the PM deposited onto a filter from proportionally extracted exhaust shall be divided by the amount of filtered exhaust.BS ISO 8178-1 pdf download.