# The Measuring Instruments Regulations 2016, Paragraph 1: Instrument Classes


Two classes (0 and I) are being defined for exhaust gas analysers. The relevant minimum measuring ranges for these classes are shown in Table 1.
Table 1
Classes and measuring ranges
Parameter
Classes 0 and I
CO fraction
from 0 to 5 % vol
CO2 fraction
from 0 to 16 % vol
HC fraction
from 0 to 2,000 ppm vol
O2 fraction
from 0 to 21 % vol
λ
from 0.8 to 1.2

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Source: https://www.legislation.gov.uk/uksi/2016/1153/schedule/1J/paragraph/1 (the official version)
Page: https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-1J/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.