Precautions when using viscometer to detect data

Posted on

According to the measurement principle of the viscometer , in order to obtain accurate and reliable measurement data, the following points must be noted:
First, the performance indicators of the viscometer must meet the requirements of the national metrological inspection regulations. The viscometer in use should be periodically checked . If necessary (the viscometer is used frequently or in a qualified critical state), an intermediate self-check is performed to determine that the metering performance is acceptable , and the coefficient error is within the allowable range , otherwise accurate data cannot be obtained.
Second, pay special attention to the temperature of the liquid being tested. Many users ignore this, that the temperature almost does not matter, our experiments show that: when the temperature deviation 0.5 ℃, some liquid viscosity deviation exceeds 5%   Temperature deviation great influence on the viscosity, temperature,   The viscosity drops. Therefore, special attention should be paid to keeping the temperature of the liquid to be measured constant near the specified temperature point . It is best not to exceed 0.1 °C for accurate measurement .
Third, the correct choice of rotor or adjust the speed , so that the torque value is between 50% -80% . E.g. Brookfield   Rotational viscometer DV-S The instrument uses a digital readout, if the torque reading is less than 10%, the relative error caused by more than 10%, or if you choose the appropriate rotational speed so that the rotor torque value shown between 50% -60%, Then the relative error can be reduced to 1 %. If the indication value is above 90% , the torque generated by the balance spring is too large, creep is likely to occur, and the hairspring is damaged, and the measured value is unreliable. So be sure to choose the rotor and speed correctly.
Fourth, the cleaning of the rotor. The measuring rotor ( including the outer cylinder ) should be cleaned and free of dirt , and should be cleaned in time after measurement , especially after the paint and adhesive are measured. Pay attention to the cleaning method , soak it with a suitable organic solvent . Never use a metal knife or other hard scraping , because there will be deviations in the measurement results when there are severe scratches on the rotor surface.
5. Most viscometers need to be adjusted . After changing the rotor and adjusting the rotor height, and paying attention to the level problem at any time during the measurement process , it will cause reading deviation or even reading.
Sixth, some Brookfield viscometers need to be equipped with a protective frame . Read the instructions carefully and install them according to the regulations .   Otherwise it will cause a reading deviation.
7. Determine whether it is approximate Newtonian fluid . For non-Newtonian fluids, the rotor, rotation speed and rotation time should be specified after the selection , so as to avoid misunderstanding that the instrument is not allowed.

In summary ,   Rotary viscometer is simple in structure and easy to use , but if it is not used correctly , a qualified viscometer, even high performance, high precision Brookfield   DV-S rotary viscometers may also have deviations in measurement results , affecting product quality and production progress.

Greenhouse Film Manual Roll Up

The Greenhouse Film Electric Roll-Up Unit replacing traditional manual roll-up unit to reach high speed automation in revolving & releasing films and greenhouse environment, it is the new generation of greenhouse ventilation and temperature regulation facilities. Portability, output torque, output lock, wide range and precise adjustment, waterproof, dew-proof and power-saving are the key characteristics for Electric Roll-Up Unit, which is the best choice for modern daylight greenhouse applied in different climates.

Greenhouse Film Manual Roll Up,Greenhouse Manual Winch,Greenhouse Side Film Roll Up

JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.alibabagreenhouse.com