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Automated Viscosity Measurement of In-Service Oils

The Anton Paar viscometer series in combination with an Xsample are reliable in determination of both kinematic and dynamic viscosity and additional calculation of the Viscosity Index (VI) according to ASTM D2270 with one filling. The systems setup is a SVM & Xsample 530, for reproducibility as well as user friendliness due to user independent filling and cleaning procedures.

Introduction

Viscosity is a key parameter to determine the quality of lube oil. In-service oil clearly shows a lower VI (Viscosity Index) and different viscosity than a fresh one of the same type. The lower the VI, the more the oil is influenced by temperature changes.

Lube oil’s viscosity and/or VI are more reliable indicators for the condition of the lube oil than mileage or time of use. It is essential to determine a used lube’s

  • Kinematic viscosity at 40 °C and 100 °C
  • Viscosity Index (VI, according to ASTM D2270)

In addition, in-service oil analysis includes various other parameters that have to be tested.

Anton Paar provides the SVM 4001 and SVM 3001 Viscometers for measurements according to to ASTM D7042 respectively to DIN 51659-2 ASTM D7042. It is an excellent alternative to conventional capillary viscometers for fast and economical measurement of the low-shear kinematic viscosity over a wide temperature range.

Consequently, ASTM D2270 references ASTM D7042 for the determination of kinematic viscosity.

Automation of viscosity measurements provides several benefits over conventional manual measurements due to reduced handling errors, higher reproducibility, reduced costs per sample and increased productivity in the laboratory.

This report describes specifically how to test inservice lube oils with the SVM 4001 in combination with Xsample 530 and a manually filled SVM 3001 to get data comparable to ASTM D445. 

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