Cannon Instrument CMRV-5000 - Manual (Page 14)

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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
Upper rotor bearing The upper bearing consists of a brass insert at the top of the rotor shaft
with a 1.2 mm hole on the shaft axis. A cylindrical rotor pin is inserted
through the upper bearing plate about one or two millimeters into the
hole on the shaft axis.
Rotor crossbar
The rotor crossbar is used to
hold the loop at the end of the
thread. It also serves as an
indicator for (optional) manual
timing of rotor rotation, and
engages the rotor locking pin
through the cooling cycle.
Rotor locking pins The rotor locking pins are used
to prevent unwanted rotor
rotation. When the locking pin
is lowered over the rotor
crossbar (see photo), rotation is
prevented. When the pins are in
the raised (detent) position, the
rotors are free to rotate.
Pulley-wheel assembly
The pulley-wheel
assembly consists of a
timing wheel with a
digital-optical sensor
permitting precise
measurement of the
wheel rotation. The
pulley-wheel base is
designed to be fitted to
the CMRV-5000 slide
track adjacent to the
viscometric cells. The
probe cable is con-
nected to the jack on the front of the CMRV-5000 housing.
Slide track The pulley-wheel assembly is designed to interlock with the pulley-
wheel slide track and move laterally so it can be aligned with the scored
marks on the track opposite each of the rotor shafts.
Winding thread
The thread used for CMRV-5000 testing is a single, nonelastic strand of
70 cm (28") winding thread of silk, cotton, or similar material (Coats
North America or comparable brand, 0.1 mm radius) with a loop on one
end. One end is wound around the CMRV-5000 rotor. The other end of
the thread is tied to a small rigid plastic ring from which the test weight
may be suspended.
Hook-weights
Hook-weights are hung on the plastic ring at the free end of the thread to
apply the required force to the rotor during yield stress and viscosity
measurements. Nine disk weights, one hook-cage, and one larger hook-
CMRV-5000 pulley-wheel assembly on slide
track
Rotor with rotor locking pin in place