Reciprocating internal combustion compression-ignition engines. Apparatus for measurement of the opacity and for determination of the light absorption coefficient of exhaust gas has-digital expressed as nitrogen nitrate(N): (mass

expressed as nitrogen nitrate(N): (mass concentration of) nitrate

BS 5938-2 provides users with general rules for drafting of performance specifications

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Reciprocating internal combustion compression-ignition engines. Apparatus for measurement of the opacity and for determination of the light absorption coefficient of exhaust gas has-digital expressed as nitrogen nitrate(N): (mass1 Scope This International Standard specifies the general requirements and the installation of apparatus for measurement of the opacity and for the determination of the light absorption coefficient of exhaust gas from internal combustion engines (not confined to road vehicles). These instruments are known as opacimeters.