BS EN 116 Diesel and domestic heating fuels - Determination of cold filter plugging point - Stepwise cooling bath method
7 Sampling
Unless otherwise specified in the commodity specification, samples shall be taken as described in EN ISO 3170 or EN ISO 3171, and/or in accordance with the requirements of national standards or regulations for the sampling of the product under test.
8 Preparation of the test sample
Filter approximately 50 ml of the sample at laboratory ambient temperature, but in any case not less than 15 °C, through dry filter paper (5.3).
9 Preparation of apparatus
IMPORTANT - The correct functioning of the automated apparatus should be verified preferably at least twice a year and, where possible, using certified reference materials. The apparatus should be checked more frequently (e.g. weekly) using an in-house secondary reference material, such as fuel of known CFPP value. Deviations greater than the test repeatability or an unacceptable statistical quality control bias should be investigated and resolved. The manufacturer's instruction manual should provide guidance on ensuring that the equipment is correctly set up and calibrated.
Prepare the equipment according to the manufacturer's instructions. Before each test, dismantle the filter unit (6.5.2), wash the pieces, the test jar (6.1), the pipette (6.5.1) and the thermometer (6.8.1) with hydrocarbon solvent (5.1), then rinse with light hydrocarbon solvent (see 5.2) and dry in a stream of filtered air. Check the cleanliness and dryness of all elements, including the jacket (6.2). Examine the wire mesh and the joints for damage; if necessary renew them. Check that the screw cap is tight enough to prevent leakage.
It is strongly recommended to inspect the filter holder on a regular basis and clean it, as needed, depending on the type of samples.
