Cannon Instrument CMRV-5000 - Manual (Page 43)

37
CANNON ® Mini-Rotary Viscometer CMRV-5000 Instruction & Operation Manual
Version 1.0b—August, 2011; CANNON ® Instrument Company
2139 High Tech Road • State College, PA • 16803 • USA
8. Repeat steps 4-7 for each of the remaining
rotors/cells.
Plexiglas ® cover placement 9. Place the Plexiglas ® cover in
position over the top of the
viscometric cells. The small hole which
allows the -46 to 30°C thermometer to extend
through the cover should be on the left when
viewed from the front of the viscometer.
10. CMRV users following the ASTM D 4684 or
ASTM D 3829 methodology should connect a
flexible 3/16"-OD tube from their dry gas supply and regulator to the
dry gas purge connection on the rear of the head unit housing.
11. Whatever the methodology, the purge should continue throughout the
temperature profile using dry gas at a flow rate between 20 and 30
milliliters per minute.
NOTES To reduce the chance of separating the mercury column during the heating
phase of the temperature profile, you may wish to initially remove the
calibrated thermometer from the CMRV unit. Store the thermometer in a
vertical position. You may replace the calibrated thermometer when the
CMRV has cooled to 30°C or lower. If the thermometer is not in place during
CMRV-5000 cooling, you should seal the thermometer well in the block and
the thermometer hole in the Plexiglas
® cover with stoppers, particularly
when the humidity of the ambient air is high. This will help prevent frost
buildup on the surface of the block and enhance temperature control.
Be sure the thread is properly wound around each rotor and the Plexiglas ®
cover is in place on top of the CMRV-5000 before proceeding with the test.
Wound rotors with cell caps in place
Side-mounted
dry gas purge
option