laboratory instruments distributor

MRV oil device is a device for measuring the apparent viscosity of engine oil at negative temperature related to oil pumping. The oil MRV device is available in accordance with ASTM D4684 and ASTM D3829 standard and as a laboratory desktop.

This device has the ability to analyze 9 samples simultaneously.

This device is used in oil and grease laboratory, oil and gas laboratory, petrochemical laboratory, refineries, standard laboratories and research laboratories.

Definition of viscosity

However, a more accurate definition of viscosity is the viscosity of measuring the resistance of a fluid to flow, or more precisely, the ratio of the force required to overcome the internal friction between fluid layers (shear stress) to change velocity. Between fluid layers (velocity slope).
Sir Isaac Newton studied the viscosity according to his second law (F = ma). A Newtonian fluid is known for its stable viscosity, even though it changes in cutting speed, like water. A non-Newtonian liquid changes viscosity after changing the cutting speed and temperature, so ketchup can be used as an example. Viscosity changes occur in response to shear stress, as a plastic bottle is squeezed to release tomato sauce. In practical applications, most viscosity measurements include non-Newtonian fluids.

The reason for measuring viscosity

Knowing the viscosity of a liquid can be very important. Many quality control measurements are based on viscosity. For example, to maintain the consistent quality of ketchup, the manufacturer must maintain the viscosity at the appropriate level so that the end consumer can satisfy the desired product.

The paint should be sprayed properly, but should not drip from the brush. The ink must come out of the pen accurately. In other cases, the design and engineering time of equipment and systems should consider viscosity to ensure that their performance is required. The size of pumps and mixers depends on the design and power of the equipment used to control and manage viscosity.

Types of viscosity

Consider the viscosity in the following values: Dynamic and kinetic. Kinematic viscosity is the ratio of the viscosity of a stream to its density or the resistance of a fluid to gravity flow. Dynamic viscosity is the ratio between the shear stress used and the shear ratio of a fluid or a measure of fluid flow resistance. When only the word viscosity is used, it means dynamic viscosity.

Viscosity measurement method

Many different techniques are used to measure the viscosity of different types of liquids and units of measurement:

Falling viscometer

Spherical viscometers measure the drop-viscosity of liquids, and some units can measure the viscosity of gases. The foundation used is described by their name.

An equation is used to calculate the viscosity based on how long the ball has passed through the tube using gravity. Repeating this process to create an average value works best. This design, which includes a variety of calculations, allows the tool to work on a wide range of outputable results.

 Viscosity cup

Different forms of viscosity cups use gravity to allow liquids to flow through the orifice at the end of a certain amount, which can be measured over time by calculating the amount of viscosity.

Common sticky cups are Ford, Ford Deep and Zan cups. When using standard oils to confirm titration, the sample temperature should be considered. These affordable glasses produce very reliable results. However, it requires a lot of tolerance to the sample temperature and the user must carefully record the results.

Consistometer

The focus meter is a metal duct with scales that measure the adhesive material as it descends from its slope under its own weight. To ensure compliance with military characteristics, compatibility meters are generally used to measure paint viscosity.

Compatibility scales are also well used for many food applications such as juices, jellies, sauces as well as laboratory chemicals. Compatibility, viscosity and flow rate can be verified by applicable standards.

The compatibility scale does not actually measure viscosity directly, but depends on the amount of liquid that flows over a period of time in an inclined path. This theory can be based on viscosity standards.

Users can set their own standards and business practices for the product being tested. Although capacitors cannot be used on all models, their low maintenance costs and ease of use have made them very popular.

Capillary glass viscometer

Capillary glass viscometers are generally used in conjunction with test methods to comply with a specific standard from the ASTM (International Organization for Standardization). A wide range of glass hair viscometers is available including Ubbelhode, Cannon-Fenske, BS / IP / RF U-tube and Zeitfuchs.

These tools are commonly used in sticky baths to maintain a constant temperature. The low cost and accuracy of these tools make them a good choice for measuring kinetic viscosity in applications such as asphalt, blood, plasma, lubricants, fuels, paints and polymers.

Two-pronged vibration viscometer

Two-pronged vibrating viscometers provide high accuracy with a reading speed of one percent. They measure viscosity by removing the excitation current required to amplify two sensor plates at a constant frequency. Unlike many of the previous tools, digital display of readings eliminates the inconsistencies caused by user shake while working. Samples with a small size of 10 to 35 ml and the ability to have a user interface are prominent features of these viscometers.

Rotary viscometer

Rotary viscometers are suitable for a wide range of measurements in millions of centimeters (units of viscosity) and are a versatile model of a viscometer. Digital viscosity readings and ease of use also provide high accuracy.

When the spindle and rpm are optimized, a user-written test can guarantee inconsistent results. As the spindle rotates through the liquid, the torque sensor reads the torque required to move the spindle in constant motion.

This velocity is related to the viscosity, which is converted to the measured value. Advanced modules include software that creates charts and graphs as well as report data. Information in this report includes the number of spindles, speed per minute, temperature and sample size. Users can also track fluid torque and gravity.

Tips for maintaining a laboratory viscometer

1. Avoid storing and using viscometers in places and environments with electrical fluctuations
2. Avoid spilling water and wet materials on the device
3. Do not tap the device
4. Use and operate the device at low voltage
5. When done, unplug the device by disconnecting the power button.
6. It should also be noted that if installing and using a viscometer, it is necessary to keep the device at a temperature between 2 to 45 degrees Celsius and humidity between 12 to 62 percent and connect it to an electrometer with a voltage of 10 amps. (single phase). 

Daneshvar Shimi Company is an importer of oil and gas laboratory equipment and oil and gas laboratory equipment, oil and grease laboratory equipment, oil and grease laboratory equipment and related chemicals. Daneshvar Shimi Company also has the ability to supply spare parts for laboratory equipment and laboratory devices purchased by centers that have problems.