In some branches things really do need to “run smoothly” – for example machines and engines. Here it is essential to have the right lubricant. Determining the viscosity and viscosity index is one way of finding out whether a lubricant has a high quality and is therefore “the right lubricant for the job”.
To keep things running smoothly it is not only the filling level that is important. With many engines and machines it is not only important to use the right lubricant but also to change the lubricant at strictly defined intervals. For each machine and engine it is also extremely important that the quality of the lubricant is within specifications during use in oder to guarantee perfect functioning. Only a clean lubricant can guarantee a long working life of the engine.
Engine oils are either synthetic oils or mineral oils. Mineral oils are derived directly from petroleum distillates; synthetic oils are chemical compounds. Special additives are added to both types. These additives are to improve the flow properties, for example, or prevent corrosion or the formation of foam. The composition gives the oil the viscosity that is required. Some oils run very smoothly during a cold start and others are more viscous.
Due to its construction, every engine needs oil. A certain amount of oil is transferred via the pistons and piston rings into the cylinder and is burned there together with the fuel-air mixture. The resulting ash may be deposited in the particle filter and cause this to become blocked over time. The viscosity value indicates whether the engine is contaminated by soot, fuel or metals, or whether the oil properties have been changed due to oxidation or there is evaporation loss and wear in general. The kinematic viscosity and the viscosity index (VI) are therefore important parameters which describe the usability and condition of the oil.
What is the viscosity index (VI)?
The VI describes the effect of temperature on the oil used.
Low VI: The viscosity changes considerably at different temperatures. The oil is highly viscous at low temperatures and relatively liquid at high temperatures.
High VI: The viscosity changes only slightly at different temperatures over a wide temperature range.
Viscosity as a crucial parameter
The viscosity is one of the most important parameters for the evaluation of lubricants. Together with the density value it gives insight into the quality. With the SVM™ 3001 Viscometer™ from Anton Paar both parameters are measured in one measuring cycle.
The measurement of the viscosity and density of lubricants with SVM™ 3001 has the following advantages:
- Simultaneous determination of kinematic viscosity and density according to ASTM D7042 and D4052 as well as EN ISO 12185
- Special VI method with automatic temperature changes and calculations
- Heating and cooling rates up to 20 °C/min
- Unrivaled ease of operation
- The built-in FillingCheck™ automatically checks whether there are air bubbles in the density cell
- The large configurable touchscreen (10.4 inch) shows several parameters at once
- SVM™ 3001 meets the requirements of ASTM D7042, D2270, D4052, D7152, D6074 and ISO EN 12185
SVM™ 3001 stands out for its ease of operation and useful features. This viscometer from Anton Paar guarantees the quality and purity of lubricants over the long term.