Measurements with or without automatic repeated measurement in four different precision classes allow for a choice of very fast up to highly precise measurements. A thermoelectric heating and cooling system ensures the temperature stability of the copper block within ±005°C from the set temperature.


SVM™ 4001 provides an unbeatable combination of features that simplify the measurement process. Both density cells are equipped with the FillingCheck™ technology compliant with D4052 requirements, which allows real-time monitoring of the filling quality of the


Figure 4. SVM™ 4001 stand-alone


density cells. This saves valuable time as bubbles are already detected during the measurement.


Viscosity measurement with SVM™ technology is compliant with ASTM D7042, where as density measurment is compliant with ASTM D445 and ISO 12185. No bias to Test Method D445 was found to exist for base oils. ASTM D7042 “Standard Test Method for Dynamic Viscosity and Density of Liquids by Stabinger Viscometer (and the Calculation of Kinematic Viscosity)” is referenced in many other standards. The most relevant standards for grease manufacturing with


reference to D7042 when testing base oils are the following ASTM standards:


• D2270 Standard Practice for Calculating Viscosity Index from Kinematic Viscosity at 40 °C and 100 °C


• D6074 Standard Guide for Characterizing Hydrocarbon Lubricant Base Oils


as well as the three following standards:


• D2501 Standard Test Method for Calculation of Viscosity-Gravity Constant (VGC) of Petroleum Oils


• D2502 Standard Test Method for Estimation of Mean Relative Molecular Mass of Petroleum Oils from Viscosity Measurements


• D4052 Standard Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density Meter


The main parameters needed to characterize base oils are shown in Fig.3.


Figure 5. SVM™ 4001 with a sample changer


For the five different oils, the viscosity repeatability lies below 0.1% whereas the density repeatability of all five base oils lies under 0.00005 g/cm³.


SVM™ 4001 is designed to provide viscosity index, kinematic viscosity, and density of lubricating oils, base oils and additives, as well as in-service oils. In order to maximize productivity and meet the demands of high throughput, the SVM™ 4001 viscometer can be used with a 71-position sample changer.


LINK http://www.anton-paar.com/svm


Figure 3. Base oil measurements with SVM™ 4001


LUBE MAGAZINE NO.138 APRIL 2017


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