Cannon HTHS Series II Instruction & Operation Manual

Cannon HTHS Series II Instruction & Operation Manual Manual pdf 21 page image

18CANNONCANNONCANNONCANNONCANNON® High-Temperature High-Shear Viscometer Series II Instruction & Operation ManualRevision 1.0d—June, 2011;CANNONCANNONCANNONCANNONCANNON® Instrument Company2139 High Tech Road • State College, PA 16803 • USA3. Toggle the Pressure/Vacuum switch to the Vacuum position andagain place the adapter on top of the charge cylinder. Turn the Pumpswitch ON to withdraw excess sample from the viscometric cell intothe charge cylinder. If necessary, the intensity of vacuum can becontrolled by using the Adjust dial on the front panel. When nitrogengas bubbles appear consistently in the charge cylinder, the samplehas been adjusted to the proper volume.NOTES At least 0.5 ml of excess oil sample should be drawn into the chargecylinder. If bubbles appear consistently before this volume has beenattained, not enough oil was used when filling the cell. You will need tointroduce additional sample and begin the soak procedure again.Empirical testing has suggested that variability in the intensity of vacuumused to withdraw excess sample from the HTHS test cell prior to testingmay alter the sample volume in the cell. For better determinability and/orrepeatability, avoid adjusting the valve setting from test to test.4. Immediately turn the pump switch OFF and turn the plug valve tothe CLOSED (horizontal) position. Remove the adapter from the topof the charge cylinder.NOTE The HTHS will not begin a test unless all plug valves are in the closed(horizontal) position).5. Verify cell temperature by checking the front panel temperaturedisplay.6. Recheck the gas pressure reading and make last-minute adjustmentsif necessary, using the INCREASE and DECREASE buttons.Testing sample(s)NOTE The HTHS will not begin a test unless all plug valves are in the closed(horizontal) position).1. Verify that the Cell Selection switch is set to the number of thedesired test cell. Using a protective glove, carefully remove thestopper from the viscometer cell exit tube. Then close the hingeddoor and begin the test immediately by pressing the Start/Stopbutton.CAUTION Make certain to remove the cap from the exit tube before initiating thesample run. Make certain that the plastic waste container is in positionunder the exit tubes.2. Precisely 10 seconds into the timed sample test, check the currentpressure from the digital pressure display and write it down.3. Wait for the test run to be completed. The end of the sample flowperiod will be indicated by an audible hiss as nitrogen gas escapesthrough the capillary tube. The internal timer gauge will trip, stop-ping the timer. The HTHS should automatically stop the flow ofpressurized gas to the test cell.