Cannon Instrument miniQV-X - Manual (Page 41)

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CANNON ® miniQV-X Automatic Viscometer with VISCPRO ® Instruction & Operation Manual
Version 1.0— October, 2008; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
In the miniQV-X, viscosity is calculated by using the viscosity calcula-
tion equations as described in ASTM Methods D445 and D 446. Because
samples running in the miniQV-X can have short flow times, the kinetic
energy correction term (E / t
2 ) is used as prescribed in the aforementioned
ASTM methods. The VISCPRO ® software for Windows ® performs all
necessary calculations to derive constants C and E. These constants are
used by the software when determining values for kinematic viscosity
using sample drop times measured by the miniQV-X.
Kinematic Viscosity equation: v = C t - E / t 2
Where: v = kinematic viscosity (cSt)
C = calibration constant (cSt/s)
E = kinetic energy correction (cSt·s 2 )
t = flow time (seconds)
NOTE When calibrating the miniQV-X, the operator should analyze the viscosity
standard using double determinations to obtain two flow times for each
standard. The average of the two flow times is used as input data for the
calibration program.