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) (c. 32)

ANNEX XII U.K.

SPECIFIC REQUIREMENTS U.K.

Other requirements U.K.

6. The resolution shall be equal to or of one order of magnitude higher than the values shown in Table 3. U.K.

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.

7. The standard deviation of 20 measurements shall not be greater than one third of the modulus of the MPE for each applicable gas volume fraction. U.K.

8. For measuring CO, CO₂ and HC, the instrument, including the specified gas handling system, must indicate 95 % of the final value as determined with calibration gases within 15 seconds after changing from a gas with zero content, e.g. fresh air. For measuring O₂, the instrument under similar conditions must indicate a value differing less than 0,1 % vol from zero within 60 seconds after changing from fresh air to an oxygen-free gas. U.K.

9. The components in the exhaust gas, other than the components whose values are subject to the measurement, shall not affect the measurement results by more than the half of the modulus of the MPEs when those components are present in the following maximum volume fractions: U.K.

• 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.

10. An exhaust gas analyser shall have an adjustment facility that provides operations for zero-setting, gas calibration and internal adjustment. The adjustment facility for zero-setting and internal adjustment shall be automatic. U.K.

11. For automatic or semi-automatic adjustment facilities, the instrument shall be unable to make a measurement as long as the adjustments have not been made. U.K.

12. An exhaust gas analyser shall detect hydrocarbon residues in the gas handling system. It shall not be possible to carry out a measurement if the hydrocarbon residues, present before any measurement, exceed 20 ppm vol. U.K.

13. An exhaust gas analyser shall have a device for automatically recognising any malfunctioning of the sensor of the oxygen channel due to wear or a break in the connecting line. U.K.

14. If the exhaust gas analyser is capable to operate with different fuels (e.g. petrol or liquefied gas), there shall be the possibility to select the suitable coefficients for the Lambda calculation without ambiguity concerning the appropriate formula. U.K.