Types of Glass Viscometers and the Considerations you Should Make when Purchasing one

Viscosity is the resistance to flow and with the advancement in technology, viscosity can be measured. There are three types of glass viscometers designed to measure the flow of liquids. The three types of viscometers are explained below to ensure you get a full understanding of the types of glass viscometers. You will also get to know the considerations you make when purchasing a viscometer.

Capillary viscometers

Capillary viscometers are also known as u-tube viscometers. They are used to tell how long it takes for a translucent liquid to flow between two points in the u-tube viscometer. Capillary viscometers are better used to measure viscosity in a transparent liquid. Opaque liquids are not clear on when the liquid reaches either side of the two points in the capillary viscometer. A thermal sensor will, therefore, be required to get the viscosity of an opaque liquid.

Rotational viscometer

Rotational viscometers use torsion to help in determining the viscosity of a liquid. A rotational viscometer allows one to get the viscosity of different liquids which may have different ranges of viscosity.

Piston viscometers

Piston viscometers determine the viscosity by measuring the resistance of a piston passing through a liquid. The time taken by the liquid to flow is observed and is used to determine the viscosity of the liquid.

Consideration you should make when purchasing a viscometer

Viscosity range

You should settle on a viscometer that allows for a high range of measurement. A vacuum viscometer would be the best to choose because it allows for a high range of measurements, unlike other viscometers which only allow the samples to flow under gravity.


To ensure that you get a standard and accurate viscosity, you should ensure that you settle for an accurate viscometer. Always ensure that you check on the types of viscometers that different manufacturers have to offer. This is to ensure that you get a good quality viscometer that will be accurate.

Temperature control

Before buying a viscometer, always ensure that it allows for regulation of temperature. Temperature can influence the measurement of viscosity since high temperature decreases the viscosity of a liquid. A decrease in temperature results in an increase in viscosity. This may alter the actual viscosity of a liquid, to avoid such situations it is therefore wise to settle on a viscometer that allows you to control the temperature. A good viscometer should have a precise temperature control. Rheology experts can also help you to make the right choice.