6/12/2023 0 Comments Viscosity index calculatorIndividual deliveries of this lubricant may have varying initial viscosities, which will make the actual alarm setting more or less than the intended 5 percent. An upper alarm is set at +5 percent, for a value of 32.6 cSt. For example, a particular ISO VG 32 lubricant is specified by the manufacturer to typically have a viscosity of 31 cSt, well within the limits of the viscosity grade (28.8 cSt to 35.2 cSt). The most common alarm variation in viscosity is within 5 percent of the new oil’s baseline viscosity. If specification viscosity values or ISO VG midpoint viscosities are used to established alarms, sensitivity is lost and false alarm rates may increase. To be effective, all alarm and limit values must be referenced to a starting condition known to provide acceptable performance. Published values on a specification sheet are typical values and are often not precise. Similarly, viscosity values for individual manufacturers’ products will vary by batch and even container. Actual viscosity values may vary from this midpoint by ☑0 percent and still be considered conforming (within grades). The ISO viscosity grade classification system (ISO VG 32, 46, 68, etc.) is merely a nominal value that establishes the midpoint of an acceptable viscosity range. The importance of establishing a baseline for viscosity monitoring cannot be over-emphasized. Therefore, it is a mistake to underestimate the importance of viscosity alarms and limits. Significant change in an oil’s viscosity is meaningful and should not be ignored. A Wright Method and the Chart Blending Method Provides Cold-Cranking Simulator (CCS) and Mini- Rotary Viscometer (MRV) viscosity calculations Calculates conversions between centistokes and Saybolt or Krebs units Enables VI calculations from kinematic viscosity measurements at any two temperatures Generates kinematic viscosity interpolation reports, and displays SAE and ISO VG Lubricant Specifications tables Provides an interface for analysis of Cold-Cranking Simulator and Mini-Rotary Viscometer data Provides temperature probe constant calculations.A fluid’s viscosity is one of its most important physical properties. Performs oil blending calculations using the W. The version 2 release of VISDISK has added a graphing capability and an NBS “best-fit” computation that analyzes multiple kinematic viscosity data points and selects the optimum viscosity curve for the sample data provided. Test data can also be used to generate a complete interpolation report at temperature increments specified by the user. An interpolation component calculates viscosity at any specified temperature or temperature at a desired viscosity. VISDISK facilitates calculation/verification of kinematic viscosity by providing a data table for input, and then performing complex viscosity and density calculations. VISDISK also provides supporting data analysis capability for several equipment items manufactured by CANNON, including the PolyVISC, Cold-Cranking Simulator (CCS), Bending-Beam Rheometer, and the CANNON Mini-Rotary Viscometer (CMRV). The VISDISK program brings computerized solutions to many difficult computational problems associated with kinematic viscosity determination.
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