Classification and measurement principle of the ho

2022-08-22
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Classification and measurement principle of viscometers

the commonly used viscometers in the production process can be divided into: rotary viscometer, ultrasonic viscometer and capillary viscometer

classification and measurement principle of viscometer

rotating viscometer

main features:

continuous induction and display of data results

optional speed can meet different measurement ranges

RTD temperature probe can be selected to monitor the base metal small amplitude rebound control sample temperature in real time

built-in automatic time measurement function (set the time to reach the specified torque and stop measurement time)

a warning will occur when the instrument is below or beyond the measurement range

usb port is connected to personal computer to realize program control and data acquisition

for rotors, the coarser the rotor, the larger the model, and the wider the range of liquid viscosity that can be measured

for the same kind of liquid, the speed increases with the increase of rotor model

for the liquid to be measured, the greater the viscosity, the smaller the rotor can measure

with the same rotor, the speed decreases with the increase of viscosity

measurement principle:

the viscosity value is measured by the torque formed by the continuous rotation of the rotor immersed in the measured liquid. The torque is proportional to the resistance formed by the viscous drag of the rotor immersed in the sample, so it is also proportional to the viscosity

ultrasonic viscometer

main features:

high precision intelligent meter controls temperature, which is more accurate

circulating water pump controls water circulation

large temperature control range

with electronic timer

with cold light illumination

it can be cleaned at normal temperature or heated

measurement principle:

ultrasonic viscometer is composed of ultrasonic detection components and electronic instruments. When the electronic instrument outputs a pulse current to excite the iron cobalt vanadium shrapnel immersed in the measured liquid, due to the magnetostrictive effect (see piezomagnetic sensor), mechanical vibration attenuated with time is generated. The attenuation speed of shrapnel in the liquid measured by the measuring circuit can express the viscosity of the liquid

capillary viscometer

main features:

equipped with a special dividing frame

the experimental force that the system can accept for the completion of the sample is as small as a few 10 centinium (such as spandex for textile) all stainless steel structure. Cleaning real estate has become an obstacle to the rapid and clean rebound of China's economy at the bottom

measurement principle:

is to measure the time that a certain volume of liquid flows through a calibrated glass capillary viscometer under gravity at a constant temperature. The product of the capillary constant of the viscometer and the flow time is the kinematic viscosity of the liquid measured at that temperature. There are many forms of capillaries, such as Ubbelohde, Pinter, Finn, countercurrent, etc. Ubbelohde capillaries are commonly used

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