BS 15938:2010 pdf download – Automotive fuels — Ethanol blending component and ethanol (E85) automotive fuel — Determination of electrical conductivity 8 Procedure 8.1 Preparation of the measuring device 8.1.1 General The device manufacturer’s instructions shall be followed for the preparation and operation of the conductometer (6.1) and the measuring cell (6.2). The thermostat (6.5) is connected with the sample vessel (6.4) and set to achieve a temperature of (25 ± 0,1) °C in the sample vessel. 8.1.2 Cleaning of the sample vessel Before the measurement, the sample vessel (6.4) is rinsed several times with ethanol (5.1). The rest of the ethanol used for rinsing shall be dripped off. If the sample vessel (6.4) has been used before for saline samples, it shall additionally be cleaned thoroughly with water (5.3) prior to using it for ethanol or ethanol fuel. Subsequently, it is dried in the drying oven at min. 80 °C. Afterwards it is rinsed once more using ethanol (5.1). If there are any visible contaminations (e.g. stains) on the inner glass surface of the sample vessel (6.4), the vessel shall not be used. 8.1.3 Cleaning of the measuring cell The measuring cell (6.2) is also cleaned by rinsing it thoroughly with ethanol (5.1). If the measuring cell (6.2) had been used before for saline samples, it shall be cleaned thoroughly with water (5.3) prior to using it for ethanol or ethanol fuel. Subsequently, it is thoroughly rinsed with ethanol (5.1). If there are any visible contaminations (e.g. stains) on the inner surface of the measuring cell (6.2), the cell shall not be used. 8.1.4 Filling the sample into the sample vessel The sample is filled into the sample vessel (6.4) by pouring it directly from the sample container into the vessel. Should an intermediate vessel be required for transferring, this vessel shall first be cleaned thoroughly using water (5.3), and dried in the drying oven at min. 80 °C. Before the intermediate vessel is used, it is rinsed with ethanol (5.1). Subsequently it shall be dripped off. Rubbing its inside with a fibrous cloth shall be avoided. The size of the intermediate vessel shall be chosen such that it is filled up to at least half its height. If there are any visible contaminations (e.g. stains) at the surface of the glass on the inside of the vessel, the vessel shall not be used. 8.2 Calibration 8.2.1 Interferences The...
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