12/8/2023 0 Comments Astm d445Ihre Daten können in die USA übermittelt werden, wo es keine mit der DSGVO vergleichbare Datenschutzregelung gibt. Wir verwenden außerdem Cookies von Drittanbietern aus den USA wie Google oder Facebook mit Ihrer Zustimmung (Art. für den Warenkorb), andere unterstützen uns dabei, unser Onlineangebot mithilfe von Analysen, externen Medien und Marketing-Services besser und langfristig einfacher für Sie zu gestalten. Wir setzen auf unserer Website Cookies ein. ![]() Measurements of opaque sample do not require additional preparation or special equipment, as optical properties are insignificant for the modified Couette principle. Ferromagnetic particles in particular must be removed using a magnetic particle trap. Samples that may contain particles, such as used oil or crude oil, must be filtered through a screen with a pore size of 75 μm before measurement. ![]() Autosamplers can be combined with a pressurized measurement unit.In case of manual filling with a syringe, a pressurized waste bottle provides suitable measuring conditions.Samples with volatile components and low boiling point may require an application of maximum 1 bar counter pressure on the measuring cells: sample changing magazine for heating the sample before the injection, and heated hoses to keep the sample fluid throughout the whole process, from the magazines to the measuring cells and finally to the waste container.hot filling attachment for manual syringe filling.lab oven for preheating in case of manual syringe filling.High pour point samples, such as waxes and heavy crude oils, require additional heating treatment before filling by the following means: For both injection methods, air bubbles can be avoided in advance by filling the measuring cell slowly and continuously. Autosamplers automatically transfer the sample into the measuring cell. Manual filling describes the injection of the sample by using a 5 mL syringe. The fluid can be injected into the measuring cell by either manual or automated sample injection equipment. Homogeneity of samples can be achieved by stirring, e.g. ![]() Air bubbles can be eliminated by treatment with an ultrasonic bath. Viscosity measurement according to ASTM D7042 requires homogeneous and bubble-free samples. A series of interlaboratory studies conducted by ASTM yields the bias corrections for various materials (including formulated oils, diesel, jet, and residual fuels) and temperatures.Īpart from the bias corrections, the results of the interlaboratory studies showed that measurement repeatability and reproducibility of ASTM D7042 are equal or comparable to ASTM D445.Ĭonsequently, ASTM D7042 is being referenced as an accepted alternative to ASTM D445 in many standards and specifications. The result obtained according to ASTM D7042 is designated by the acronym X, and the corrected kinematic viscosity by the acronym Y. The mathematical conversion formula between the two standard methods is described as follows: The kinematic viscosity values obtained with the test method ASTM D7042 are equivalent to ASTM D445, as long as the appropriate bias correction is applied. ASTM D445 describes the standard measurement procedure for the kinematic viscosity measurement of petroleum products by using glass capillaries.
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