Cannon Instrument miniAV-LT - Manual (Page 36)

CANNON ® miniAV-LT Automatic Viscometer with VISCPRO ® Instruction & Operation Manual
Version 1.a— May, 2009; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
32
A separate calibration must be performed for each temperature at which
samples will be tested.
Calibration procedure
1. Assemble a group of CANNON ® standard oils with known kine-
matic viscosities for calibration. Use at least two different standards
for the bulb. Refer to the following table when choosing the appro-
priate standards.
2. Complete sample ID data entry for each standard.
3. After entering each sample ID, click on the highlighted ID entry
using the RIGHT mouse button (or press 5). Then select Verify
Known KV from the popup window. The Viscosity Action window
will appear.
4. Enter the viscosity (in centistokes) for each sample from the standard
bottle, along with other desired configuration settings; then click OK.
Prewash option: Click the Prewash option if the tube is not clean and
dry. VISCPRO will initiate a cleaning cycle using current wash configu-
ration settings prior to initiating the sensor training procedure.
Trip Points Only option: Click the Trip Points Only option to adjust
the senor trip points without setting the voltages. This is useful if it is
necessary to adjust trip points on sensors for which voltages have already
been set.
After selecting the desired training options click Start and follow the
software prompts to complete the sensor training.
Standard tube calibration
During standard calibration, the software uses check standard data
obtained from miniAV-LT tests to perform the mathematical calculations
necessary to derive new constants for each timing bulb of the viscometer
tube. Then the VISCPRO software displays the new constants and
computes a viscosity (in cSt) for each sample using the actual flow time
of the check standards. The resulting viscosity calculation is compared
with the known viscosity of the standard; absolute and comparative data
is displayed on the computer screen.
NOTES The software allows the operator to manually change the constants if
necessary to more closely match the known viscosities of the standards.