Cannon Instrument miniPV-X - Manual (Page 63)

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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
Maximum tube empty time %: Adjust this setting to select the percentage of the drop time between the
bottom sensor and the sensor at the top of bulb 1. The default value is
100%.
Pull Sample Pulse On Time Adjust this setting to help eliminate bubbles that can occasionally be
formed as the vacuum draws some types of samples into the viscometer
tube. The pulse value is a percentage of time that the sample will be
drawn up into the tube during each five-second interval of the draw
period. A setting of 100% (default setting) will not pulse the sample. A
setting of 20 would pull the sample for one second in each five-second
interval. Sample pulsing should only be used if it is found to alleviate
bubbling during the sample draw period.
Vent Bulb Drain Time Adjust this setting such that the vent bulb and vent are cleared of sample
before the sample menious drops to the top sensor. Acceptable values are
between 0 and 250 seconds.
Apply Vent Bulb Drain Time Select which bulb to apply the Vent bulb drain time parameter.
Bulb overdraw Use the Bulb Overdraw button/window to set the the amount of time in
seconds that the instrument will draw sample AFTER the sample menis-
cus has covered the target sensor in the viscometer tube. More viscous
materials may require a larger overdraw time to ensure that the sample
meniscus does not dip below the target sensor during temperature
equilibration.
Proper adjustment of the overdraw can maximize efficiency of the test
cycle. Too much overdraw can contaminate vacuum lines and interfere
with pump operation. Too little overdraw can interfere with the initiation
of sample testing following the temperature equilibration period. Note
that lighter oils will be pulled higher in the bulb.
Saving a configuration
Whenever you have altered instrument, tray or sample configuration, you
should save the resulting settings as a new or existing configuration. To
save current settings, use the
Save Instrument option: