How to choose a rotary viscometer? This is enough
A rotary viscometer is a common experimental instrument used to measure the viscosity of a liquid, questo è, the degree of stickiness of a liquid. It determines viscosity by measuring the resistance of a liquid as it flows through a rotating cylinder or disk. These instruments are widely used in laboratories, production lines, and quality control.
How to choose a rotary viscometer? This is enough
Rotational visvisometers, which work on the basis of Newtonian fluid mechanics, use a rotor (usually a rotating cylinder or disk) to rotate in a liquid and measure the relationship between the shear stress of the liquid and the shear rate. According to the definition of Newtonian fluid mechanics, viscosity is the ratio of shear stress to shear rate. In the rotary visvisometer, the shear stress is generated by the resistance of the liquid to the rotating rotor, while the shear rate is determined by the rotating rotor speed.
This issue of technology has sorted out the selection guide and viscosity range of domestic rotary viscometer selection suggestions. Let’s start with the meaning of viscosity measurement.
How to choose a rotary viscometer? This is enough
Why do you need to measure viscosity?
By measuring the viscosity, the rheological behavior of the object can be obtained, which has important guiding value for predicting the process control, transportation and operability of the product during use. Rheological properties are usually related to other product characteristics, such as color, density, stability, solid content and molecular weight variation. Viscosity measurement is a sensitive and convenient method to detect these properties.
Viscosimeter selection guide and configuration instructions
1. Determine the measuring range of the viscometer
Viscometers are divided into LV (low viscosity), RV medium viscosity), HA and HB (high viscosity) models according to their range. The viscosity measurement range of each model is determined by the rotor available. Tra loro, LV type is standard equipped with 4 rotors; RV/HA/HB three models are standard equipped with 6 rotors R2~R7, R1 optional). The measuring range will be extended if viscosity measuring accessories are added. The measuring range is determined by the optional accessories.
How to choose a rotary viscometer? This is enough
2. Temperature control is very important for accurate viscosity measurement
UN) Medium temperature range (-20C~95C), choose constant temperature bath to control the temperature.
B) High temperature range (100C~250C), select NKY-25 electric heater for temperature control.
3. Determine whether to choose viscosity measurement accessories according to sample characteristics
UN) Sample supply quantity: 8-13mL, select SSR small sample adapter
B) If the sample viscosity is lower than 15cP, ULR ultra-low viscosity adapter is selected.
4. Viscosity standard solution
It is used to check whether the viscometer is in normal condition and is recommended for regular use
How to choose a rotary viscometer? This is enough
5. Determine the model according to the application scope and purpose of the machine
UN) For laboratory quality control — basic viscometer
B) For product development — touch screen viscometer
C) Used for data comparison of upstream and downstream suppliers — selected according to actual measurement conditions
Viscosity range selection suggestions
