一、 Overview
ZNN-D6SP digital display six-speed rotary viscometer is a new viscometer newly designed by our company. This viscometer adopts an embedded microprocessor design, built-in high-precision angle sensor, and is driven by a stepper motor, and the speed is more stable and accurate; the touch screen operation is more intuitive and not easy to damage. The viscosity value and stirring speed of the test liquid are displayed in real time on the touch screen. This product can be widely used in petroleum, chemical, food, pharmaceuticals, cosmetics and other industries and scientific research units.
Introduction to the working principle: Place the slurry cup with the liquid to be tested on the tray, and the liquid to be tested enters the annular space (shear gap) formed between the viscometer jacket cylinder and the float. When the stepper motor drives the jacket cylinder to rotate, the sleeve is subject to sticky resistance in the liquid to be tested to produce a reaction force, which will pass through the ring empty The liquid to be measured in the room generates torque on the float in the sleeve, and the float is connected to a set of scale components. When the torque and sticky resistance are balanced, the dial component will be stable at a certain scale value. Because the scale value is directly proportional to the sticky resistance of the sleeve, the scale value can be multiplied by a specific coefficient to get the most The final viscosity value is also displayed on the LCD screen for reading.
The shear rate and viscosity value have a linear correspondence, that is, the relationship between shear stress and shear rate is a straight line. In practical application, many fluids may not follow Newton's law, but their rheology is closer to Newton's law, so they can still be measured by a viscometer, and the measured viscosity value is relatively accurate. The calibration method of the ZNN-D6SP digital six-speed rotary viscometer is linear calibration in Newton mode, which is not applicable to samples to be tested that do not meet Newton's linear calculation method. In this case, nonlinear calculation methods should be used for viscosity measurement and velocity calculation.
When the jacket cylinder, float, and torsion spring run at a rate of 300r/min, the unit of measurement of the viscometer is per per (or millipascal/s). The data measured at other rotational speeds requires a series of multiplication conversions. The sixth part of this article will give the viscosity calculation method of pseudoplastic fluids (such as drilling fluid).
When choosing different rotational speeds or using different torsion spring-float combinations, the optional range of shear rate may change. In order to broaden the range of shear stress and measure more liquids, it can be solved by replacing different torsion springs.
二、Model and specification
ZNN-D6SP：F1 Torque Spring Measurement Component
F0.2 Torque Spring Measurement Component (optional)
三、Main technical parameters
- Rated power supply: AC110/220V±5% 50/60Hz
- Motor power: 40W
- Ambient temperature: ≥20±5℃
- Ambient humidity: 45%RH~60%RH
- Motor speed L: 800 r/min
- Transmission range: 3, 6, 100, 200, 300, 600r/min
- Measurement accuracy: ±0.1 mPa.s (Nutonian fluid)
- Viscosity measurement range Newtonian fluid:
0~300mPa.s (F1 measurement component)
0~60mPa.s (F0.2 measurement component)
- Non-Nutonian fluid:
0-150 mPa.s (F1 measurement module)
0-30 mPa.s (F0.2 measurement component)
- Shear stress:
0～153.3Pa (F1 measurement component)
0～30.7Pa (F0.2 measurement component)
- Explicit function with touch digital display function
