Cannon Instrument miniPV-X - Manual (Page 41)

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CANNON ® miniPV-Series Automatic Viscometer with VISCPRO ® Instruction & Operation Manual
Version 1.a— January, 2011; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
in effect until the instrument is recalibrated at that same temperature, or
until instrument and tray settings from a previously-saved instrument
configuration are restored.
To avoid losing valid calibration data, CANNON ® recommends saving
the instrument configuration settings after completing a new calibration
(see Saving a configuration, chapter 4). The name for the instrument
configuration might ordinarily identify the instrument, the calibration date,
and the temperature:
EXAMPLE: miniPV JAN10 40C
After the instrument configuration has been saved, calibration data may
be restored at any time using the
Restore Instrument & Tray Settings
option from the Configure menu. Note that the Restore Instrument
Settings and Restore Tray Settings check boxes must both be selected
to restore instrument calibration data:
NOTE The Restore Instrument Settings and Restore Tray Settings options are
security-protected at the Manager level.
miniPV Series calibration equations
Viscosity calculation equation In the miniPV Series, viscosity is calculated by using the viscosity calcu-
lation equations as described in ASTM Methods D445 and D 446.
Because samples running in the miniPV Series 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 Win-
dows ® 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 miniPV
Series.
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 )