Temperature plays a decisive role in viscosity measurement. As soon as liquids heat up or cool down, their viscosity also changes. The temperature control of samples therefore enables constant measurement results when using viscometers. There are often even internal specifications as to the temperatures at which the products must be tested. With our various temperature control solutions, you can both heat and cool your products and we will be happy to advise you on the right device for you.
Cooling Thermostat
A water bath for heating and cooling samples from our partner Julabo.
Peltier Chamber
For temperature control of measurements via the current flow and can both heat and cool.
Cone-Plate-Stand
A cone-shaped measuring body rotates in the sample on a temperature-controlled plate.
Temperature Control Chamber
For connection to a cooling thermostat for optimum temperature control.
Viscosity and temperature: a strong dependency
Knowledge of the dependence of viscosity and temperature is of great interest wherever the rheological properties of substances at different temperatures are considered. The best examples are fuels or lubricants used in engines. The flowability of the fuel must be guaranteed at the lowest temperatures, and the lubricating film of a lubricant must not break off even at the highest operating temperatures. Proof of these properties has recently become the subject of increased discussion, particularly with the approval of biological fuels. But what measurements are possible and how much measuring effort is sensible and necessary? With a few exceptions, the viscosity of a substance depends on the temperature. Anyone who has ever spread butter on their bread rolls during a long breakfast in summer will be familiar with this. At first, the butter is almost impossible to spread because it comes from the fridge, but after a while it just flows away when you touch it with a knife. What does this mean for the rheological properties? The viscosity of butter decreases with increasing temperature. Even at a constant temperature, the viscosity is not a constant, but decreases as a result of shear stress (e.g. when spread on a bread roll). Viscosity is a measured variable that is dependent on both temperature and shear stress. What follows from this? First of all, when specifying viscosity, it should always be ensured that the viscosity is measured in accordance with DIN (e.g. 53 019) and that the shear rate and temperature are specified.
proRheo Peltier chamber – the development of our own temperature control unit
Viscometers work most accurately at a constant temperature. That is why we have designed the Peltier chamber for temperature control of the measurements. This is a housing with an inlet for the measuring cylinder and 4 Peltier elements installed around it. The Peltier chamber is then operated via an external control unit.
How does the Peltier chamber work?
A Peltier element is an electrothermal converter that generates a temperature difference based on the Peltier effect when current flows through it or a current flow when there is a temperature difference. Peltier elements can be used for both cooling and heating.
Our Peltier chamber makes use of this effect and covers a temperature range from 0°C to 75°C and can be set to an accuracy of 0.01°C using the OSTECH control unit.
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