What do I need to pay attention to in the process of using the viscometer?

  Viscometer in the use of what should be noted when the content

  1, the performance indicators of the instrument must first meet the requirements of the metrological verification regulations or meet the calibration standards. The instrument in use to carry out periodic calibration, if necessary (the instrument is used frequently or in a qualified critical state) to carry out intermediate self-check to determine its metrological performance qualified, the coefficient error within the permissible range, otherwise accurate data can not be obtained.

  2, must pay special attention to the temperature of the sample being measured. Many users tend to ignore this point, that the temperature difference does not matter, the actual experimental evidence: when the temperature deviation of 0.5 ℃, some liquid viscosity value deviation of more than 5%. Temperature deviation has a great impact on viscosity, temperature increases, viscosity decreases. Therefore, special attention should be paid to the temperature of the measured liquid constant in the vicinity of the specified temperature point, the best for accurate measurement should not exceed 0.1 ℃.

  3, the measurement container (sample cup) selection. For the double cylinder measurement system to read the manual carefully, different rotor (inner cylinder) need to match the corresponding outer cylinder (sample cup), otherwise the measurement results will deviate greatly. For a single cylinder rotational viscometer, the principle requires an infinite radius of the outer cylinder, the actual measurement requires the outer cylinder that the inner diameter of the measurement vessel is not less than a certain size.

  4, the choice of rotor and rotational speed. Correctly select the rotor or adjust the rotational speed, so that the torque percentage of the readings shown in the 10% to 100%. Torque Torque percentage is too low, the measured readings are invalid; too high, the measurement is over the range, but also no readings.

  5, the rotor is immersed in the depth of the liquid and the impact of the bubble. Rotational viscometer on the depth of the rotor immersed in the liquid has strict requirements, must be operated in accordance with the requirements of the manual (some double cylinder instruments have strict requirements for the amount of liquid tested, must be measured with a cylinder). In the process of rotor immersion in the liquid often with bubbles, in the rotor rotation after a period of time most will float up and disappear, attached to the lower part of the rotor bubbles sometimes can not be eliminated, the presence of bubbles will bring greater deviation to the measurement data, so 45 ° angle tilt slowly immersed in the rotor is an effective way.

  6, timely cleaning of the rotor. Measurement of the rotor (including the sample cup) to be clean and free of dirt, generally to be cleaned in time after the measurement, especially after the measurement of paint and adhesives. Once the use of unclean rotor measurement samples, often introduce unpredictable effects on the measurement results.

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