Cannon Instrument CMRV-5000 - Manual (Page 8)

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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
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Networking capability for multiple instruments
The VISCPRO ® software can control/monitor up to four CMRV instru-
ments with one computer via RS-485 serial connections. See APPENDIX
D for more information.
Instrument overview
The CANNON ® Mini-Rotary Viscometer is designed for precision
control of temperature over time, enabling accurate yield stress and
viscosity measurement of oil samples in conformance with ASTM D
3829, ASTM D 4684, ASTM D 6821 and ASTM D 6896 test methods.
Test procedure Oil samples placed in the CMRV-5000 viscometric cells are heated and
cooled at a predetermined rate according to a user-specified cooling
profile. The cooling profile parameters are downloaded to the CMRV-
5000 onboard memory via a serial interface with the host computer. The
CMRV-5000 then uses this profile to control the rate of temperature
change, independent of the host computer.
All three methods specify that the samples be initially heated to ensure
that all components of the sample are released into solution. The samples
are then slowly cooled to the test temperature using the user-selected
temperature profile and maintained at test temperature for a specified
soak period. Following the soak period, apparent viscosity (and yield
stress if applicable) for each sample is determined by applying a constant
torque to, and measuring the rotational speed of, a cylindrical rotor
which has been immersed in the sample.
The time required for completion of the ASTM D 3829 test cycle is
approximately 19 hours. The time required for completion of the ASTM
D 4684 (TP-1, two-day) test is 45½ to 53½ hours. The time required for
completion of the ASTM D 6821 test cycle is approximately 18 hours.
The time required for completion of the ASTM D 6986 test cycle is
approximately 43½ to 53½ hours.
NOTE See Chapter 10 for additional information on the ASTM procedures.