Cannon Instrument CAV-2000 - Manual (Page 23)

17
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
Local mode operation
The Local mode option permits manual control of CAV functions via the
control keypad on upper front panel of the Bath Unit. Local mode offers
the advantage of convenient and quick testing for an individual sample.
The single-sample drop time or kinematic viscosity is displayed on the
vacuum fluorescent display (VFD).
NOTE The VFD is equipped with a screen saver feature which will reduce the
intensity of the display if the keyboard is not touched for five minutes. To
restore the original intensity of the display, press any key on the keypad.
Selecting Local mode
To select Local mode operation, toggle the Remote/Local (RMT/LOC)
button on the keypad on the Bath Unit to select Local mode operation.
When the unit is in Remote mode, the front panel display will indicate
REMOTE operation. If the display does not indicate REMOTE opera-
tion, then the instrument is in Local mode.
NOTES Local mode may be selected at any time during CAV operation. Remote
operations will be suspended. When switching from Remote to Local
mode, it is the user’s responsibility to monitor the instrument tube
state(s) and to properly prepare the instrument before running tests.
Operator intervention is required to test each sample in Local mode.
Additionally, test data is not saved to the VISCPRO
® database and
viscosity calculations must be performed manually.
Setting temperature
WARNING
Prior to setting the bath temperature, ensure that the reference thermom-
eter in the bath is suitable for the desired temperature range. If not,
remove thermometer from the bath (see previous page). If the bath
temperature rises above the range of the thermometer, it may be dam-
aged. Mercury thermometers pose particular problems, since mercury
from a damaged thermometer may circulate with bath fluid.
To set the temperature in Local mode, press the Set Temp key on the
front panel keypad, select the desired bath (CAV-2200 only) and input the
target (desired) temperature(s) using the keypad characters. Then press
the Enter key. Acceptable values are any numbers between 20°C and
100°C (150°C for high-temperature CAV models). If necessary, you may
use the decimal point key to input temperature to the nearest 0.01°C.
NOTE To cancel temperature selection before completing the procedure, press
the Set Temp key a second time.
After the target temperature has been set, the CAV bath temperature will
be adjusted to the target temperature and the bath will equilibrate at the
test temperature. When the instrument has attained a temperature within