By Simon Tung, Bernard Kinker, Mathias Woydt

ISBN-10: 0803145055

ISBN-13: 9780803145054

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Additional resources for Automotive Lubricant Testing and Advanced Additive Development (ASTM special technical publication 1501)

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HENDERSON AND MAGGI ON VISCOMETRIC TEMPERATURE SENSITIVITY 23 FIG. 6—Impact of power ratio on apparent viscosity of Oil E1—SAE 5W-30. contain twelve data pairs for each offset while Fig. 6 contains 27 data pairs for each temperature offset. The number of pairs exceeding 1 % difference is similar to that seen with the data in Fig. 3. The previous discussion centered on data from SAE 0W-xx and 5W-xx formulations. Figure 7 shows the viscosity temperature relationship for Oil H1, an SAE 10W-30 formulation.

13 shows a visual pattern indicating a lack of bias between instrument models for the population of data tested. The boundaries for repeatability, r, and reproducibility, R, are shown in Fig. 13. The lines were drawn as if making the comparison between a reference value and another value, where the reference value was the CCS 5 measurement. The variance between the CCS-2100 and CCS-5 appears to increase as the test temperature decreases. The data at −30 and −35° C have a much larger spread than that at the other temperatures.

Often, this problem can be seen as temperature control instability during the viscosity measurement step. Another possible cause is an error made when entering the probe constants into the software. An additional cause could be with the CCS electronics which may drift out of tolerance over time. The authors would like to point out that the manufacturer has made available temperature circuit test plugs for evaluating the performance of the CCS temperature measurement electronics. In the past ten years, two PR ratios have been used in the instrument.

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Automotive Lubricant Testing and Advanced Additive Development (ASTM special technical publication 1501) by Simon Tung, Bernard Kinker, Mathias Woydt


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