First, pay special attention to the temperature of the measured liquid. 会认为温度差一点没有关系。 Many users tend to ignore this and think that the difference in temperature is okay. 当温度偏差0.5 ℃ However, our experiments prove that : when the temperature deviation is 0.5 ℃ 有些液体粘度值就会偏差超过5% ,温度偏差对粘度的影响很大,温度升高,粘度下降。 When the viscosity value of some liquids deviates more than 5%, the temperature deviation has a great influence on the viscosity . As the temperature increases , the viscosity decreases. 对精确测量最好不要超过0.1 ℃。 Therefore, care should be taken to keep the temperature of the measured liquid constant at the specified temperature point , and it is best not to exceed 0.1 ℃ for accurate measurement.
When selecting a measuring container. 不同的转子匹配相应的外筒,否则测量结果会偏差很大。 For example, when using a dual-cylinder rotational viscosity timer, you must carefully read the instrument's instruction manual . Different rotors match the corresponding outer cylinder , otherwise the measurement results will vary greatly. 原理上要求外筒半径无限量大,实际测量时要求外筒即测量容器的内径不低于某一尺寸。 For a single cylinder rotational viscometer , the outer cylinder radius is required to be infinitely large in principle, and the inner diameter of the outer cylinder, that is, the measuring container, should not be less than a certain size in actual measurement.
3. The performance indicators of the instrument must meet the requirements of the national metrological verification regulations. 当仪器使用频繁或处于合格临界状态时要进行中间自查以确定其计量性能合格,系数误差在允许范围内,否则无法获得准确数据。 Periodically verify the instrument in use . When the instrument is used frequently or in a critical state of compliance, an intermediate self-inspection is performed to determine that its measurement performance is qualified , and the coefficient error is within the allowable range , otherwise accurate data cannot be obtained.
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