![]() Instead of using the vendor specifications for cup conversion you can directly use the SRV measurements and cup second measurements over a range. Replacing these values in equation (2) we can find coefficient a:Īnd replacing result of equation (4) in equation (3), we can find coefficient b. If we use Shell cup #3 over the measurement range of 18.6 to 28.6 seconds, the viscosities in cP over that range are 25 to 40 cP respectively. For example, in the table below, the equivalencies between the cup seconds and centipoise can be seen for a measurement range:įigure 1 Cup second equivalencies – these are generally valid for a certain type of viscometer so they are not universal.įor example. You can find different conversion tables online or from the cup manufacturer. You could also find the direct relationship empirically between the SRV and the cup.Īnd “b” can be found by selecting the maximum or minimum over the measurement range.įinding coefficients from specifications: If your cup is not listed in the table above, then you can use the specifications sheet of the cup to find a relationship between cup seconds measurements and cP. Table 1 Cup second conversion coefficients Calculating Custom Coefficients: Where a and b are the slope and offset between the two respectively.įor different cup types we have found the following relationships between cup seconds measurements and dynamic viscosity in cP: ![]() Therefore, we can simplify the relationship as: We assume that there is a linear relationship between the cup second measurements and the dynamic viscosity in cP (mPa.s). Rheonics SRV viscosity measurements can be converted to cup seconds, for different cup types, and for small viscosity variations. Finding coefficients from specifications. ![]() Modified on: Tue, 19 Apr, 2022 at 8:21 PM Solution home Measurements Viscosity Cup Second Conversion and Coefficients for Rheonics SRV ![]()
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