density, and temperature and is filled in one go. The viscosity measuring range of the cell is from 0.2 mm²/s to 30 000 mm²/s, whereby the temperature range is from -60 °C to +135 °C (-20 °C is reached without external cooling). This measuring range allows for measuring a wide range of samples of different viscosity with one integrated measuring cell and, combined with very fast heating and cooling rates as well as the powerful temperature scans, this opens new possibilities in lubricating oil testing.
Fast Heating/Cooling Rates With traditional bath systems for temperature control, the user normally needs to choose the measuring temperature and never change this temperature 24/7 until the next scheduled maintenance. In contrast, SVM™ 3001 has very fast heating/cooling rates of up to 20 °C/min. Such fast temperature changes allow for extraordinary flexibility when choosing the samples, measuring temperatures, and tests that need to be performed. Paired up with the wide temperature range of SVM™ 3001 from -60 °C to +135 °C and the possibility to perform fast and easy temperature scans, it is possible to obtain valuable information on the viscosity behavior of the lubricating oils. Together with the small sample volume of just 1.5 mL (for both viscosity and density determination) not only temperature changes but also thermal uniformity is rapidly achieved. The direct thermo-electric cooling by Peltier elements provides very sensitive and fast control of the cell temperature. So, after entering a new set temperature, it takes only a few minutes for the instrument to be ready for the next test.
With built-in air cooling, SVM™ 3001 can reach -20 °C without the need for any thermal transfer liquids or external devices.
The True Value of Temperature Scans As fuel economy and long drain intervals are the most important requirements for trucks and buses, when developing engines the analysis of the oil is very important. One of the most important parameters is the viscosity of the oil – at different temperatures. Therefore, a temperature scan is very helpful for the construction engineers to do calculations of the bearings in order to ensure that enough protective film is available.
After one injection of the sample via syringe, SVM™ 3001 can run a temperature scan from -20 °C to
+130 °C in 10 °C steps. Since SVM™ 3001 does not need any external cooling to reach -20 °C, the entire measurement is done with one stand-alone instrument in a simple manner. All data are available about 1h 25 min after the start of the scan and no operator attendance is needed in the meantime. Measurement values for kinematic viscosity are obtained, but also for dynamic viscosity and for density – all in one graph (Figures 2 and 3).
Fig 2. Temperature scan graph
Fig 3. Temperature scan table
Integrated Density Measurement Due to the density oscillator integrated in SVM™ 3001, the density measurement according to ASTM D4052 or ISO 12185 is carried out simultaneously with the viscosity measurement. In other words, the density thermal coefficient of the current sample is a measured value instead of the typical value for the product group. This offers various possibilities and hence flexibility. Since density at 15 °C or 20 °C is commonly needed, a temperature table scan can be set up with the required temperatures (e.g. 15 °C, 40 °C, 100 °C) as shown in Fig. 3. Another possibility would be API calculations of density over temperature, which are integrated in the instrument software and are freely selectable on the 10.4” touchscreen.
Continued on page 42 LUBE MAGAZINE NO.144 APRIL 2018 41
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