RS OIML R 99-1&2: 2008
Instruments for measuring vehicle exhaust emissions — Part 1: Metrological and technical requirements — Part 2: Metrological controls and performance tests


This International Recommendation specifies the metrological and technical requirements and tests for digital measuring instruments (hereafter termed “instrument(s)”) that serve to determine the volume fractions of certain components of the exhaust gases emanating from motor vehicles. The conditions with which such instruments shall comply in order to meet any OIML performance requirements are also established.
It is applicable to instruments, particularly those used according to the procedure defined in ISO 3929, intended for the inspection and maintenance of in-use motor vehicles with spark ignition engines. These instruments are used to
determine the volume fraction of one or more of the following exhaust gas components:
-carbon monoxide (CO);
-carbon dioxide (CO 2);
-hydrocarbons (HC, in terms of n-hexane); and
-oxygen (O 2) at the moisture level of the sample as analyzed.
In addition to the measurement of these components, the instruments can be provided with a facility to determine the value of “lambda” (see 3.32).
This Recommendation applies to instruments whose principle of detection is based on infrared absorption in gases for CO, CO 2 and HC.
Oxygen is generally measured with a fuel cell. It is not intended, however, to exclude any other types of instruments that, although based on other principles of detection, meet the specified metrological and technical requirements and satisfy the associated tests. Three accuracy classes of the instruments, Class 00, Class 0, and Class I are included.
This Recommendation does not apply to equipment for on-board diagnostics incorporated in motor vehicles.

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RS OIML R 99-1&2: 2008OTHER STANDARDSMetrology and measurement. Physical phenomena46First Edition
Apr 2016

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