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The Concept Of Viscosity The liquid in the flow, the nature of internal friction between its molecules, known as the viscosity of the liquid, the size of the viscosity expressed in terms of viscosity, is used to characterize the nature of the liquid related to the resistance factor. Insulating oil viscosity and general liquid viscosity concept are the same, that is, the internal friction of the liquid, that is, the insulating oil under the action of external forces, for relative laminar flow movement. Insulating oil molecules ask about the nature of internal friction resistance. The greater the internal friction of the insulating oil, the greater the viscosity, the more difficult the flow, and poor heat dissipation performance. Viscosity is expressed in more ways and can be broadly divided into two categories: viscosity directly measured according to the definition of viscosity is called "absolute viscosity", such as dynamic viscosity, kinematic viscosity, etc. If the viscosity measured under certain conditions and the known viscosity of the liquid comparison is called "relative viscosity" or "condition viscosity", such as the En's viscosity. According to the measurement method, viscosity is generally divided into three types: kinetic viscosity, kinematic viscosity, and Ennis viscosity. The Usage Method Of Viscometer (1) . The viscometer must be kept horizontal. (2) . The rotor should be placed in the sample to avoid air bubbles, otherwise, the measured viscosity value will be reduced, the way to avoid this is to put the rotor into the sample at an angle, then install the rotor, the rotor must not touch the wall and bottom of the cup, the measured sample must not exceed the specified scale. (3) . When measuring different samples again, the rotor must be kept clean and dry, if the rotor is left with other samples or water left after cleaning, it will affect the accuracy of the measurement. (4) . Acidity (PH) should not exceed a maximum of 2. If the acidity is too large a special rotor should be used and a good sample volume (only 16 ml) should be determined when using the ULA. (5) . The viscosity standards are selected according to the measured viscosity range, and the instruments are verified before each use of the viscometer or rheometer, or calibrated periodically to ensure the accuracy of the measurement. Silicone oil or oil standards conforming to Newtonian fluid properties are available for each viscosity range with an accuracy of ±1%. The recommended use period for viscosity standards is one year from opening. (6) . When connecting the rotor, you should gently hold and pinch the mandrel (on the main body) with your left hand, and rotate the rotor with your right hand. This operation is to protect the mandrel and the balance wire inside the body, which can prolong the service life of the viscometer. (7) . The value should be taken when the value is relatively stable, otherwise, there will be a large error in the value obtained. (8) . When choosing a rotor, look at the viscosity of the sample being measured and the number of rotors that have the closest measurement range. The Application Of Viscometer In practical engineering and industrial production, viscometers are often required to measure the viscosity of fluids online to ensure the best process operating environment and product quality, thereby improving production efficiency. The online measurement of fluid viscosity in a process provides data on the rheological behavior of the fluid, which is an important guide for predicting the process control, transportability, and operability of the product in use. The properties of the liquid are often related to other characteristics of the product such as color, density, stability, solid content, and molecular weight changes, and the most convenient and sensitive way to detect these characteristics is to test the viscosity of the liquid online. The most convenient and sensitive way to test these properties is to test the viscosity of liquids online. In the production process, online viscosity testing can minimize the scrap rate and production line downtime according to the range of process technology requirements. The above is a brief introduction to viscometer, if you have more ideas about viscometer, welcome to consult and discuss them.

High Speed Centrifuge High-speed centrifuge is a conventional laboratory centrifuge, widely used in biology, chemistry, medicine, and other scientific research, education, and production departments, it uses the strong centrifugal force generated by the high-speed rotation of the rotor to separate the components of liquid and solid particles or liquid mixtures, suitable for the rapid separation of micro-sample synthesis. Basic Principles Of High Speed Centrifuge When a suspension containing fine particles is left standing, the gravitational field makes the suspended particles gradually sink. The heavier the particles, the faster they sink, and conversely, the particles with a density smaller than that of the liquid will float. Particles in the gravitational field of the speed of movement and particle size, form, and density, and with the strength of the gravitational field and the viscosity of the liquid. Particles the size of red blood cells, with a diameter of several microns, can be observed in the usual gravitational effect of their sedimentation process. In addition, the settling of substances in the medium is accompanied by diffusion phenomena. Diffusion is unconditional and absolute. Diffusion is inversely proportional to the mass of the substance; the smaller the particle, the more severe the diffusion. Sedimentation is relative, conditional, and subject to external forces in order to move. Settling is proportional to the weight of the object, the larger the particle, the faster it settles. For particles smaller than a few microns, such as viruses or proteins, which become colloidal or semi-colloidal in solution, it is not possible to observe the settling process using gravity alone. the smaller the particles, the slower they settle, and the more severe the diffusion phenomenon. Therefore, it is necessary to use high speed centrifuges to generate strong centrifugal forces in order to force these particles to overcome diffusion to produce a settling motion. Centrifugation is the use of the powerful centrifugal force generated by the high-speed rotation of the rotor of the centrifuge to accelerate the settling speed of the particles in the liquid and to separate the substances with different settling coefficients and buoyancy densities in the sample. Applications Of High Speed Centrifuge High speed centrifuges generally have a rotational speed between 10,000 and 30,000 r/min and are equipped with a chilling system. Due to the high rotational speed and high centrifugal force, it is an effective preparation instrument for high purity separation, concentration, and refinement of suspended substances in sample solution and extraction of various samples for research. It is an important instrument used in medical, pharmacy, biology, chemistry, agricultural science, food and environmental protection, and other scientific research and production departments, and is widely used for various drugs and biological products, such as blood, cells, proteins, enzymes, nucleic acids, viruses, hormones and so on.

Desktop Centrifuge Desktop centrifuges are machines that use centrifugal force to separate components in a mixture of liquid and solid particles or liquid and liquid. A desktop centrifuge is mainly used to separate solid particles in suspension from the liquid, or to separate two liquids of different densities in an emulsion and insoluble in each other (for example, separating cream from milk); it can also be used to exclude liquid from wet solids, such as using a washing machine to dry wet clothes; special ultra-speed tubular separators can also separate gas mixtures of different densities; using the different densities or particle sizes of solid particles in the liquid to settle at different rates, some sedimentation desktop centrifuges can also classify solid particles by density or particle size. Desktop Centrifuge Precautions (1) Before running the tabletop centrifuge, cut off the power and release the centrifuge brake first, you can try to rotate the drum by hand to see if there is a braking situation. (2) Check other parts for looseness and abnormal conditions. (3) Turn on the power and start the machine in a clockwise direction (it usually takes about 40-60 seconds from a standstill to normal operation). (4) Usually, each piece of equipment must run empty for about 3 hours after arriving at the plant, and it can work without any abnormalities. (5) Materials should be placed as evenly as possible. (6) It must be operated by a person, and the capacity must not exceed the rated amount. (7) It is strictly forbidden to run the machine at excessive speed, so as not to affect the service life of the machine. (8) After the machine is started, if there is any abnormality, it must be stopped and checked, and if necessary, it must be dismantled and repaired. (9) The desktop centrifuge works at high speed, so do not touch its drum with your body to prevent accidents. (10) The mesh of the filter cloth should be determined according to the size of the solid phase particles of the separated materials, otherwise, the separation effect will be affected. In addition, when installing the filter cloth, the filter cloth should be (11) The sealing ring should be embedded in the drum sealing groove to prevent the material from running in. (12) In order to ensure the normal operation of the centrifuge, the rotating parts should be oiled and maintained after every 6 months. At the same time, check the running lubrication at the bearing, whether there is wear; brake device in the parts of the wear and tear, serious replacement; bearing cover for oil leakage. (13) After the machine is used, should do a good job of cleaning, and keeping the machine neat and tidy. (14) Do not use the non-anti-corrosive centrifuge for the separation of highly corrosive materials; in addition, strictly in accordance with the equipment requirements, and regulations, a non-explosion-proof centrifuge must not be used for flammable, explosive occasions. Desktop Centrifuge Applications Desktop centrifuges are used in the medical field as follows: Hospitals, CDC, blood centers, animal husbandry and aquaculture, radioimmunization; Desktop centrifuges are used in the research field as follows: Universities, research institutes, R&D centers, and laboratories (for the isolation of subcellular organelles, proteins, viruses, and other samples); Desktop centrifuges are used in the production field as follows: Bioengineering, biopharmaceuticals, genetic engineering (for DNA purification/separation and post-processing cleaning work), biochemistry, plant extracts, blood preparations (filtration and concentration, separation of blood components and microbial cell collection), food processing, petrochemicals, milk, and fat separation.

Magnetic Stirrer The magnetic stirrer is mainly used for stirring or heating low-viscosity liquid or solid-liquid mixtures at the same time. The basic principle is to use the principle of homogeneous repulsion and heterogeneous attraction of the magnetic field to push the magnetic stirrer placed in the vessel to run in a circular motion, so as to achieve the purpose of stirring the liquid. Together with the heating temperature control system, the sample temperature can be heated and controlled according to the specific experimental requirements to maintain the temperature conditions required for the experimental conditions and to ensure that the liquid mixture meets the experimental requirements. The Working Principle Of Magnetic Stirrer The magnetic stirrer uses the property that magnetic substances are homogeneous and repulsive to drive the rotation of the magnetic stirrer by constantly changing the polarity of the two ends of the base, and the rotation of the magnetic stirrer drives the rotation of the sample to make the sample evenly mixed. Heating of the sample by the bottom temperature control plate, with the rotation of the magnetic stirrer to heat the sample evenly to the specified temperature. The heating power is adjusted to allow a controlled rate of temperature rise for a wider range of sample-handling processes. A general magnetic stirrer has two roles: stirring and heating. Specifically. The first role is to mix the reactants well and to make the temperature uniform. The second role is to speed up the reaction rate, or evaporation rate, and shorten the time. The Precautions Of Magnetic Stirrer 1. Stirring found when the stirrer jumping or not stirring, please cut off the power to check whether the bottom of the beaker is flat and whether the position is positive, and please measure the voltage is now used between 220V ± 10V, otherwise, the above situation will occur. 2. The heating time should not be too long, intermittent use to extend the life, and not stirring when not heating. 3. Medium-speed operation can work continuously for 8 hours, and high-speed operation can work continuously for 4 hours, to prevent violent vibration when working. 4. Electricity: the power socket should be a three-hole safety socket, and must be properly grounded. 5. The instrument should be kept clean and dry, forbid the solution to flow into the machine to avoid damage to the machine, and cut off the power when not working.

In chemical experiments, pressure-reducing devices are usually used, and the devices used to reduce pressure in the laboratory, there are usually water vacuum pumps and oil vacuum pumps. The advantages of an oil vacuum pump are a large vacuum degree and a good pumping effect. The disadvantages are: high cost, easy to leak oil and gas, pollution of air; oil vacuum pump decompression machine mechanical structure is complex, strict working conditions, more pipeline interfaces, more auxiliary equipment (three dry cooling traps), the connection is difficult; if the experiment students do not operate according to the rules, low boiling point organic substances are easy to penetrate into the liquid, so that oil deterioration, not only lower the vacuum, but also must often change the oil, resulting in waste, and increasing the workload of the experimenter. And the advantages of a water vacuum pump are easy to use and clean, no air pollution, and environmental protection. Water vacuum pump and oil vacuum pump have their own advantages and disadvantages in the process of use, LACHOI on the basis of their improvement, designed a kind of water pump and oil pump in one, to overcome their shortcomings of the decompression device - circulating water vacuum pump, the key to its technology is to design and install a clear water pump on the original use of glass decompression pump, the use of clear water pump pumping cycle to achieve the decompression purpose. In the process of experimental teaching and scientific research, the experimental effect is remarkable and has been well-received by teachers and students. Circulating Water Vacuum Pump Improvement (1) Circulating Water Vacuum Pump Improvement In Working Principle The circulating water vacuum pump pumps water in the fixed water reservoir through the glass decompression pump, which sucks in and compresses the gas and removes it, and empties the external safety bottle, thus increasing the decompression efficiency. (2) Circulating Water Vacuum Pump Improvement In Configuration Pumping: Pumping water in a fixed water reservoir through a glass depressurization pump and thus depressurization. Safety bottle: prevent water from being sucked back into the working system, and also plays a role in relieving the internal and external pressure during operation; easy to observe when inadvertently sucked back, and easy to discharge the backed-up liquid. Air pressure gauge: measure the degree of evacuation. The circulating water vacuum pump improvement in configuration can be shown in the figure. Circulating Water Vacuum Pump Improvement Conclusion (1) The improved circulating water vacuum pump can overcome the disadvantages of oil pump decompression machines such as complicated mechanical structure, strict working conditions, easy oil leakage, and increased pipeline interface. (2) The addition of a freshwater pump to the original glass decompression pump can overcome the vacuum of the pump small degree, and the shortcomings of the water pressure; so that the water pressure can be greatly increased and stable, so that the decompression efficiency is improved, the experimental results show that the water circulation vacuum pump The experimental results show that the evacuation effect of circulating water vacuum pump is three times of the effect of the water pump. (3) The water in the sink can be recycled, which saves water, is easy to use, clean and inexpensive. (4) The requirements of the working environment are not high, and it is not affected by acid, alkali, water vapor, and low boiling point organics. (5) More economical than oil vacuum pumps, durable and easy to store and use. (6) According to the principle of circulating water vacuum pump can be assembled into a platform type or walking type at will, which is very suitable for students' experimental use and meets the needs of teachers' scientific research. (7) The circulating water vacuum pump has been successfully developed and shown through experiments that its maximum pressure can reach 0.02Mpa, and it has been used in many chemical experiments to achieve good results, and has been promoted in many schools in various laboratories, and has been well received by teachers and students.

A magnetic stirrer or hot plate stirrer is a laboratory device used to stir liquids usually at a set temperature. Magnetic stirrers have the ability to maintain a consistent speed and prevent stirring bars from bumping into the sides of containers. If you`re new to using magnetic stirrers or are looking for a refresher, this blog post will introduce you to the basics of thermostatic magnetic stirrers. You`ll learn about the different types of magnetic stirrers, how they work, and what to consider when choosing one for your lab. Thermostatic Magnetic Stirrer When it comes to mixing liquids, a magnetic stirrer is an essential piece of equipment. A thermostatic magnetic stirrer is even better, as it can maintain a set temperature while stirring. This is ideal for applications where precise temperature control is necessary, such as in a laboratory setting. How does a thermostatic magnetic stirrer work? It uses a heating element to warm the liquid being mixed, and a stirring motor to keep it in motion. The two are controlled by a thermostat, which ensures that the liquid remains at the desired temperature. There are many benefits to using a thermostatic magnetic stirrer. For one, it allows for more precise temperature control than other types of stirring methods (such as manual stirring). Additionally, it eliminates the need for constantly monitoring the temperature, as the thermostat will automatically turn off the heating element once the set point is reached. If you're looking for an efficient way to mix liquids and keep them at a consistent temperature, then a thermostatic magnetic stirrer is the way to go! The Working Theory Of Thermostatic Magnetic Stirrer The working theory of thermostatic magnetic stirrers is that they use a magnet to create a rotating field that stirs a liquid. The rotation of the field creates a shearing force on the liquid, which causes it to flow. The shearing force is created by the interaction of the magnetic field with the molecules in the liquid. The Features Of Thermostatic Magnetic Stirrer A magnetic stirrer is a laboratory device that employs a rotating magnetic field to cause a stirring action in a container holding a liquid or other substance. The stirring action can be used to mix, agitate, or heat the substance. Thermostatic magnetic stirrers add the capability of regulating and maintaining the temperature of the substance being stirred. This is accomplished by circulating heated or cooled water through a heating/cooling coil around the outside of the container. Some thermostatic magnetic stirrers also include the ability to control the speed of stirring, as well as an alarm to notify the user if the desired temperature is not being maintained. The Application Of Thermostatic Magnetic Stirrer Thermostatic magnetic stirrers are devices that use magnets to stir liquids in a container. The device typically consists of a heating element and a stirring element, with the latter being controlled by a knob or switch. The device is placed on top of a container filled with liquid, and the user can then set the temperature and stirring speed. The main advantage of using a thermostatic magnetic stirrer is that it allows for very precise control over the temperature of the liquid is stirred. This is because the heating element can be accurately calibrated to maintain a specific temperature, while the stirring element can be set to rotate at a specific speed. This means that users can mix different liquids together without worrying about them overheating or cooling too quickly. Another advantage of thermostatic magnetic stirrers is that they are very easy to use. They are also very safe, as there is no risk of spillage or burns associated with using them. Finally, thermostatic magnetic stirrers are relatively inexpensive, which makes them an attractive option for many users.

A vacuum pump is a device that extracts air from a sealed environment, thus creating a vacuum. Vacuum pumps are widely used in industrial processes, as well as in medical and scientific laboratories. In this blog post, we will be discussing the working theory and application of oil-free diaphragm vacuum pumps. We`ll explain different kinds of diaphragm pumps and how they can be used in various industries. We`ll also discuss the benefits of using oil-free diaphragm vacuum pumps over other types of vacuum pumps. So read on to learn more about this unique piece of technology! Overview Of Oil Free Diaphragm Vacuum Pump As the name implies, oil free diaphragm vacuum pumps do not require any oil for lubrication. These pumps are used in a wide variety of applications where it is necessary to maintain a clean, dry environment. One of the most common uses for these pumps is in the semiconductor industry, where they are used to create the ultra-clean environment necessary for the manufacturing process. Other common applications include food and beverage processing, pharmaceuticals, and laboratory research. Oil free diaphragm vacuum pumps work on the principle of positive displacement. A diaphragm is used to pump air out of the chamber, which creates a vacuum. This vacuum can then be used to power various types of equipment or processes. The advantage of using an oil free pump is that there is no risk of contamination from lubricating oils. The Working Theory Of Oil Free Diaphragm Vacuum Pump Oil free diaphragm vacuum pumps are positive displacement pumps that use a diaphragm to move a volume of air. The diaphragm is connected to an eccentric shaft that is driven by an electric motor. The rotation of the shaft causes the diaphragm to move up and down, which in turn draws air into the pump and then pushes it out. The working theory of oil free diaphragm vacuum pump is very simple. It makes use of the positive displacement principle to draw in air and then push it out. The advantage of using this type of pump is that it does not require any lubrication, which makes it ideal for applications where there is a possibility of oil contamination. The Application Of Oil Free Diaphragm Vacuum Pump Oil free diaphragm vacuum pumps are positive displacement pumps that use a piston to draw in air through an inlet valve and then force it out through an outlet valve. These pumps are typically used for low-pressure applications such as vacuum filtration, cell culture, and freeze-drying. The application of oil free diaphragm vacuum pump is not very different from the conventional one. The working of this pump is also reliant on the atmospheric pressure. This difference between the two types comes into effect when there is a change in atmospheric pressure. The working of oil free diaphragm vacuum pumps is not very different from that of the other types of pumps, but they differ in their constructional features.

The rotational viscometer is an essential tool for measuring the viscosity of liquids. This device is a critical component of many industrial processes, including food manufacturing and paint production. Knowing how to properly operate and maintain your digital rotational viscometer is key to ensuring it works as efficiently and accurately as possible. In this blog post, we`ll discuss the basics of operating and maintaining a digital rotational viscometer – from calibration to cleaning, troubleshooting, and more! The Digital Rotational Viscometer The digital rotational viscometer is a bench-top instrument that measures the absolute or relative viscosity of a fluid. It consists of a spindle that is rotated at a constant speed in the fluid, and the torque required to maintain that speed is measured. The resulting measurement is typically expressed in centipoise (cP). Most digital rotational viscometers have two operating modes: absolute and relative. In absolute mode, the viscometer measures the actual viscosity of the fluid being tested. In relative mode, the viscometer measures the fluid's viscosity relative to another fluid (usually water). Relative measurements are useful for comparing different fluids or for tracking changes in a single fluid over time. To use a digital rotational viscometer, simply fill the measuring cup with the fluid being tested and place it on the spindle. Select the appropriate operating mode and spindle speed, then start the rotation. The torque required to maintain the selected speed will be displayed on the screen. When finished, simply empty the measuring cup and rinse it out with water. The Operation Of The Digital Rotational Viscometer The digital rotational viscometer operates by measuring the torque required to rotate a spindle at a constant speed in a fluid sample. The torque is measured by an electronic sensor and displayed on a digital readout. The viscometer also measures the temperature of the fluid during the test and automatically corrected for density variations due to temperature changes. To operate the digital rotational viscometer, first fill the sample chamber with the fluid to be tested. Then select the appropriate spindle for the viscometer based on the size of the sample chamber and the viscosity of the fluid. Select a rotation speed for the spindle, typically between 20 and 200 rpm. Lower the spindle into the fluid and allow it to reach equilibrium speed before starting the measurement. Start the measurement and observe the digital readout of torque. To end the measurement, stop rotating the spindle and remove it from the fluid. The Maintenance Of The Digital Rotational Viscometer The maintenance of the digital rotational viscometer is very important in order to keep it functioning properly. There are a few things that need to be done on a regular basis in order to maintain the digital rotational viscometer. First, the digital rotational viscometer should be calibrated on a regular basis. This can be done by following the instructions in the user manual. Second, the sensors and other parts of the digital rotational viscometer should be cleaned on a regular basis. This can be done with a soft cloth and some mild soap. Third, the digital rotational viscometer should be stored in a cool, dry place when not in use. By following these simple maintenance steps, you can ensure that your digital rotational viscometer will function properly for many years to come.

LACHOI Scientific Instrument (Shaoxing) Co., Ltd is proud to announce its participation in Analytica Vietnam 2023, which will be held from April 19 to 21 in Ho Chi Minh City. This exhibition has become one of the largest and most influential laboratory exhibitions in the region, bringing together leading companies and professionals in the field. As a manufacturer and supplier of innovative laboratory equipment, LACHOI Scientific Instrument (Shaoxing) Co., Ltd looks forward to showcasing our latest products and technologies at the event. We are excited to meet with existing customers and potential partners, and to discuss how we can provide customized solutions that best meet their needs. At our booth, visitors can see our state-of-the-art laboratory instruments and devices, including overhead stirrer, magnetic stirrer, centrifuges, and more. Our experienced team will be on hand to offer demonstrations and answer any questions about our products and services. During Analytica Vietnam 2023, LACHOI Scientific Instrument (Shaoxing) Co., Ltd will take this opportunity to network with industry peers, exchange ideas, and gain insights into the latest trends and innovations in the laboratory industry. We believe that this event will help us to further enhance our expertise and strengthen our position as a leading laboratory equipment provider in Asia and beyond. We invite you to visit us at Booth No.F27 in Hall No.A1 at Analytica Vietnam 2023. We look forward to meeting you and discussing how we can help you achieve your laboratory goals.