lexiara

6.

Council Directive 70/220/EEC of 20 March 1970 on the approximation of the laws of the Member States relating to measures to be taken against air pollution by gases from positive-ignition engines of motor vehicles · European Union

PROCEDURE FOR SAMPLING AND ANALYSIS 6.1. Sampling 6.1.1. Sampling shall begin as soon as the valve has been opened as indicated in item 5.2.2. 6.1.2. If several bags are used the bag shall be changed at the beginning of the first idling period of a cycle. 6.1.3. The bag shall be hermetically closed as soon as it is full. 6.1.4. At the end of the last cycle the valve shall be operated to divert the gases produced by the engine into the atmosphere. 6.2. Analysis 6.2.1. The gases contained in each bag shall be analysed as soon as possible and in any event not later than twenty minutes after filling of the bag in question began. 6.2.2. If the sampling probe is not left permanently in the bag, the entry of air into the latter during insertion of the probe and the escape of gases from the bag during extraction of the probe should be avoided. 6.2.3. The analyser shall be in a stabilised condition within one minute of its connection to the bag. 6.2.4. The figure adopted as the content of the gases in each of the effluents measured shall be that read off after stabilisation of the measuring instrument. 6.3. Measurement of volume 6.3.1. To avoid wide temperature variations, the volume of the bag or bags shall be measured as soon as the gases have reached room temperature. 6.3.2. The bags shall be emptied by passing the gases through the gas gauge. 6.3.3. The temperature (tm) used for the calculations shall be the arithmetic mean of the temperatures at the beginning and at the end of emptying, the maximum permissible difference between these two temperatures being less than 5 ºC. 6.3.4. The pressure (Pm) used for the calculations shall be the arithmetic mean of the absolute pressures recorded beginning and at the end of emptying, the maximum permissable difference between these two pressures being less than 4 mm of mercury. 6.3.5. The volume of gas drawn off for analysis shall be added to the volume measured by the meter if the first volume is equivalent to more than 1 per cent of the measured volume. The result obtained shall be designated by the symbol Vm.

· All articles ·

Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.