A viscometer is an instrument used to measure the viscosity of a fluid (liquid or gas). Viscosity is the physical quantity of internal friction that occurs in a fluid as it flows. It is the ability of the fluid to resist deformation and is an important indicator for identifying some finished or semi-finished products. Viscosity varies with fluid type and temperature. What are the Different Types of Viscometers? The following are seven common types widely used in petrochemical, pharmaceutical, food, light industry, textile and other fields.
Capillary Viscometer
A capillary viscometer is a common viscometer, often called a Zeeman viscometer. The working principle is as follows: the sample container (including the outflow capillary) is filled with the sample to be tested and placed in a constant temperature bath. The height of the liquid column is H. Open the stopcock, the sample begins to flow to the receiver, and at the same time start counting the time when the sample liquid level reaches the mark. The more viscous the sample, the longer the calculation time. Therefore, this time directly reflects the viscosity of the sample.
Rotational Viscometer
A common Rotational Viscometer is the cone and plate viscometer. It is mainly composed of plate and cone plate. The motor drives the plate to rotate at a constant speed through the variable speed gear. The sample to be tested is kept between the two plates through capillary action, and the friction between the molecules of the sample drives the cone to rotate. Under the action of the torsion spring in the torque Detector, the conical plate will not rotate after a certain angle. At this time, the torque applied by the torsion spring is related to the internal friction force (ie viscosity) of the sample to be tested: the greater the viscosity of the sample, the greater the torque. There is a variable capacitor in the torque Detector, and its moving piece rotates with the cone plate to change its capacitance value.
The digital display Rotational Viscometer has the advantages of high measurement accuracy, good anti-interference performance, reliable test results, simple operation, and beautiful appearance. In addition, we provide digital Rotational Viscometers with viscosity measurement ranges from 1~100,000 mPa.s to 100-13000000 mPa.s, etc.
Vibration Viscometer
Vibration viscometers work on the principle that objects in a fluid are hindered by the fluid as they vibrate. The magnitude of this effect is related to the viscosity of the fluid. The ultrasonic viscometer is a commonly used vibrating viscometer, and the Detector is equipped with shrapnel. When excited by a pulsed current, the shrapnel produces mechanical vibrations in the ultrasonic range. When the shrapnel is immersed in the sample, the magnitude of the shrapnel is related to the viscosity and density of the sample. When the density is known, the viscosity can be obtained from the measured amplitude data.
Solder Paste Viscometer
Solder paste viscometer is mainly used to measure solder paste, film thickness paste, adhesive, solder paste solder resist, liquid solder resist, ink, solder paste, etc. A solder paste viscometer can measure the internal seal of a sample and has a temperature regulation tip. It can then be connected to a PC. The solder paste viscometer can automatically measure and read the data, and then automatically calculate the results.
Portable Viscometer
The portable viscometer adopts coaxial double cylinder design. Cooperating with the sensor to maintain a fixed flow rate, the viscosity can be correctly measured according to the viscosity change after the connection is stirred.
Stormer Viscometer
Stormer Viscometers are used to measure the KU of paints and other coatings. Stormer Viscometer is designed according to ASTM standard and GB9269-88 standard. The Stormer viscometer adopts a single-chip microcomputer, and the operator can directly read the KU value of the tested sample from the instrument without looking up the table.
Ultrasonic viscometer
Ultrasonic viscometer consists of ultrasonic detection elements and electronic instruments. When the electronic instrument outputs a pulse current, it will excite the iron-cobalt-vanadium shrapnel immersed in the measured liquid. Ultrasonic viscometers experience a decay of mechanical vibration over time due to the magnetostrictive effect. The attenuation rate of the shrapnel in the liquid is measured by the measuring circuit, and the obtained result can represent the viscosity of the liquid.
