A&D Weighing SV-100 - Manual (Page 18)

16
4-4-2 At Calibration
When calibrating, enter the product of the absolute viscosity value and the density of the standard
viscosity fluid used for calibration, as a correction value.
The standard viscosity fluid has the calculation sheet of kinetic viscosity and viscosity at various
temperatures attached. To obtain the correction value using this sheet, do as follows:
Kinetic viscosity = From this, Density = ⋅ ⋅ ⋅ ⋅ ⋅ [2]
Correction value = Viscosity × Density ⋅ ⋅ ⋅ ⋅ ⋅ [3]
When substituting [2] for the density in [3], the following equation is obtained.
Correction value = ⋅ ⋅ ⋅ ⋅ ⋅ [4]
Example 1: To calibrate the viscometer using a standard viscosity fluid:
Using the calculation sheet, calculate the value used for calibration.
(1) Check the kinetic viscosity and the viscosity at the temperature when the calibration is
performed.
Here, 1011 mm 2 /s for the kinetic viscosity and 889 mPa ⋅s for the viscosity at 20°C
as an example.
(2) Substitute the values above into equation [4].
≅781
781 mPa ⋅s is obtained as a correction value used for calibration.
(3) After calibration, measure the viscosity of the standard viscosity fluid used and confirm
that the viscometer displays the similar value as the correction value, 781 mPa ⋅s in
this example. This completes the calibration procedure.
Example 2: To calibrate using a standard viscosity fluid with known values of viscosity and density.
In this example, a standard viscosity fluid with a viscosity of 889 mPa ⋅s at 20°C is used.
(1) Check the viscosity value and the density of the standard viscosity fluid at the
temperature when the calibration is performed..
Here, 889 mPa ⋅s for the viscosity and 0.878 for the density at 20°C as an example.
(2) Substitute the values above into equation [3].
889 × 0.878 ≅ 781
781 mPa ⋅s is obtained as a correction value used for calibration.
(3) After calibration, measure the viscosity of the standard viscosity fluid used and confirm
that the viscometer displays the similar value as the correction value, 781 mPa ⋅s in
this example. This completes the calibration procedure.
Viscosity
Density
Viscosity
Kinetic viscosity
Viscosity 2
Kinetic viscosity
889 2
1011