Because the Rotational Viscometer is cheap , easy to operate , and has a wide measurement range , it is currently used most in enterprises and scientific research institutions . This viscosity determination method is also the national standard method for starch viscosity determination .
Rotational Viscometer
The working principle is : they measure the viscosity value through the torque formed by the continuous rotation of the rotor immersed in the tested liquid , and the torque is proportional to the resistance formed by the viscous drag of the rotor immersed in the sample , and thus proportional to the viscosity .
The rotary viscometer has a wide range of applications and is suitable for measuring the apparent viscosity of various Newtonian fluids and non-Newtonian fluids .
The more common domestic rotary viscometer is the NDJ -79 rotary viscometer in Shanghai , which is equipped with a sample insulation device , which keeps the sample at a certain temperature range through a circulating Water Bath to reduce errors caused by temperature fluctuations . Many domestic modified starch companies generally use this viscometer to measure the viscosity and stability of starch paste . The most famous imported Rotational Viscometer is the product of American Brook - field Company , which is a laboratory and online Rotational Viscometer manufacturer . Many foreign enterprises and research institutes use the company's viscometer .
Related instruments and accessories for viscosity measurement of modified starch are :
Programmable viscometer or rheometer ;
Small sample adapter with rotor and sample holder with temperature probe ;
Circulating Water Bath with programmable controller ;
Special software and computer
Connect for data acquisition and analysis .
The professionalism of this instrument lies in its online real-time monitoring of the viscosity of the sample , and the special software can be used to draw the curve of viscosity changing with temperature .
