Cannon Instrument CAV-2000 - Manual (Page 36)

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
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The entered temperature must be within the operational temperature
range of the bath (20°C/68°F to 100°C/212°F or 20°C/68°F to
150°C/302°F inclusive for the CAV high-temperature model).
The entered actual temperature must not cause a correction in tem-
perature greater than +/- 2.5 degrees.
To clear the BIN offset for the current temperature, select 2) Zero
Current Temperature Offset.
Multiple corrections Multiple or successive entries of correction for any temperature are
permissible. A newly entered corrected temperature is mathematically
compensated with the previously entered correction and is stored in
memory by the onboard microprocessor as the latest correction.
Data entry errors The CAV will not accept temperature reference data outside the param-
eters noted previously.
Additionally, if the amount of the correction (delta to displayed tempera-
ture) is too large, the correction will not be accepted.
Training sensors
It is necessary to train instrument sensors in preparation for sample
testing at a specific temperature. The training procedure establishes the
proper power level for sensor detection of the sample meniscus. That data
is then stored by the CAV instrument, and recalled when testing at that
temperature. The sensor training procedure requires approximately 30
minutes (longer at lower temperatures).
NOTE You will be prompted to train sensors by the instrument hardware or
software whenever a new temperature is selected for CAV operation.
You will be unable to test samples until the training has been completed.
Sensor training data remains valid until the sensors are retrained at the
same temperature. Retraining is necessary only when the viscometer
tube is changed, or if sensor performance changes over time.
Procedure Sensor training is accomplished in Local mode. To train sensors, press
the Menu button on the control panel. Then select option 5 (Train
Sensors) and follow the display prompts to complete the training
procedure.
Standard tube calibration
During standard calibration, the software uses check standard data from
CAV tests to perform the mathematical calculations necessary to derive
new constants for each timing bulb of the viscometer tube. Then the
program displays the new constants and computes a viscosity (in cSt) for