Cannon Instrument miniAV-LT - Manual (Page 40)

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CANNON ® miniAV-LT Low Temperature Automatic Viscometer with VISCPRO ® Instruction & Operation Manual
Version 1.a— May, 2009; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
miniAV-LT calibration equations
Viscosity calculation equation In the miniAV-LT, viscosity is calculated by using the viscosity calcula-
tion equations as described in ASTM Methods D 445 and D 446. Because
samples running in the miniAV-LT 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 miniAV-LT.
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 miniAV-LT, the operator should analyze the viscos-
ity 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.