Calibration procedure – Cannon Instrument CAV-2000 User Manual
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CANNON
®
Automatic Viscometer Models CAV-2100 and CAV-2200 with VISCPRO
®
Instruction & Operation Manual
Version 2g — May, 2009; CANNON
®
Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
each sample using the actual flow time of the calibration standards. The
resulting viscosity calculation is compared with the known viscosity of
the standard and displayed on the computer screen.
NOTES
The software allows the operator to manually change the constants if
necessary to more closely match actual viscosities.
A separate calibration must be performed for each temperature at which
samples will be run.
Calibration procedure
1. Assemble a group of CANNON
®
standard oils with known kine-
matic viscosities for calibration. Refer to the following table when
choosing the appropriate standards.
NOTE
For the calibration procedure, select oils such that at least two oils are
tested in each timing bulb, since a minimum of two oils per timing bulb is
necessary for proper calibration.
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If you Verify Known KVs regularly, it may not be necessary to process
additional calibration standards. Existing sample data for the standards
may be retrieved from the software database by specifying the appropri-
ate time parameter from the software selection options (see steps 6-12).
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.
NOTE
If you will not be using previous check sample data for calibration, make
sure that tests are performed with at least two different standard oils for
each timing bulb on the viscometer tubes being calibrated.
If a calibration standard viscosity has NOT been entered (or if the default
viscosity value of 1.000 has not been accepted by the user), a yellow
arrow (current sample) or red circle caution symbol will appear to the left
of the sample ID: