- Y Diweddaraf sydd Ar Gael (Diwygiedig)
- Pwynt Penodol mewn Amser (31/01/2020)
- Gwreiddiol (Fel y’i mabwysiadwyd gan yr UE)
Directive 2014/32/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of measuring instruments (recast) (Text with EEA relevance)
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The relevant requirements of Annex I, the specific requirements of this Annex and the conformity assessment procedures listed in this Annex, apply to exhaust gas analysers defined below intended for inspection and professional maintenance of motor vehicles in use.
Exhaust gas analyser | An exhaust gas analyser is a measuring instrument that serves to determine the volume fractions of specified components of the exhaust gas of a motor vehicle engine with spark ignition at the moisture level of the sample analysed. These gas components are carbon monoxide (CO), carbon dioxide (CO2), oxygen (O2) and hydrocarbons (HC). The content of hydrocarbons has to be expressed as concentration of n-hexane (C6H14), measured with near-infrared absorption techniques. The volume fractions of the gas components are expressed as a percentage (% vol) for CO, CO2 and O2 and in parts per million (ppm vol) for HC. Moreover, an exhaust gas analyser calculates the lambda value from the volume fractions of the components of the exhaust gas. |
Lambda | Lambda is a dimensionless value representative of the burning efficiency of an engine in terms of air/fuel ratio in the exhaust gases. It is determined with a reference standardised formula. |
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 |
For the climatic and mechanical influence quantities:
a minimum temperature range of 35 °C for the climatic environment;
the mechanical environment class that applies is M1.
For the electrical power influence quantities:
the voltage and frequency range for the AC voltage supply;
the limits of the DC voltage supply.
For the ambient pressure:
the minimum and the maximum values of the ambient pressure are for both classes: pmin ≤ 860 hPa, pmax ≥ 1 060 hPa.
For each of the fractions measured, the maximum error value permitted under rated operating conditions according to point 1.1 of Annex I is the greater of the two values shown in Table 2. Absolute values are expressed in % vol or ppm vol, percentage values are percent of the true value.
Table 2 | ||
MPEs | ||
---|---|---|
Parameter | Class 0 | Class I |
CO fraction | ± 0,03 % vol ± 5 % | ± 0,06 % vol ± 5 % |
CO2 fraction | ± 0,5 % vol ±5 % | ± 0,5 % vol ± 5 % |
HC fraction | ± 10 ppm vol ± 5 % | ± 12 ppm vol ± 5 % |
O2 fraction | ± 0,1 % vol ± 5 % | ± 0,1 % vol ± 5 % |
The MPE on lambda calculation is 0,3 %. The conventional true value is calculated according to the formula set out in point 5.3.7.3 of Regulation No 83 of the Economic Commission for Europe of the United Nations (UN/ECE)(1).
For this purpose, the values displayed by the instrument are used for calculation.
either the change in the measurement result is not greater than the critical change value laid down in point 4;
or the presentation of the measurement result is such that it cannot be taken for a valid result.
Table 3 | ||||
a 0,01 % vol for measurand values below or equal to 4 % vol, otherwise 0,1 % vol. | ||||
Resolution | ||||
---|---|---|---|---|
CO | CO2 | O2 | HC | |
Class 0 and class I | 0,01 % vol | 0,1 % vol | a | 1 ppm vol |
The lambda value shall be displayed with a resolution of 0,001.
6 % vol CO,
16 % vol CO2,
10 % vol O2,
5 % vol H2,
0,3 % vol NO,
2 000 ppm vol HC (as n-hexane),
water vapor up to saturation.
The conformity assessment procedures referred to in Article 17 that the manufacturer can choose between are:
B + F or B + D or H1.
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