Cannon Instrument CMRV-4500 - Manual (Page 15)

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CANNON ® Mini-Rotary Viscometer CMRV-4500 Instruction & Operation Manual
Version 1.1e—October, 2011 • CANNON ® Instrument Company
2139 High Tech Road • State College, PA • 16803 • USA
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-weight are
provided. Weights vary depending on the
ASTM Method used for testing.
Temperature probe CMRV-4500 block temperature is detected by
a 3k-ohm temperature probe, which must be
seated securely in the thermistor aperture at the
rear of the CMRV housing and plugged into
the electronic chassis.
Thermometers The CMRV-4500 unit is shipped from CAN-
NON ® with two thermometers to be used to check the temperature of the
block.
The long thermometer used for the probe and cell calibrations is a
PRINCO mercury-thallium calibrated thermometer with a range of
-46°C to +30°C in .2°C increments and an accuracy of ± 0.01°C
below 20°C.
NOTE If a thermometer is removed from the CMRV-4500 when the unit is
cooling, plug the thermometer aperture in the Plexiglas
® cover to prevent
ice formation around the rotors.
The shorter, high-temperature uncalibrated thermometer has a range
of 0°C to 105°C in 1°C increments with an accuracy of ± 1°C.
Air/Water Heat Exchanger
CMRV-4500 cooling is
accomplished with internal
thermoelectric cells and an
external Air/Water Heat
Exchanger circulating a
mixture of water and
antifreeze to remove heat
from the thermoelectric
modules.
The Air/Water Heat Ex-
changer contains the elec-
tronics necessary to monitor
the coolant flow rate and regulate the action of the circulating pump
during the running of ASTM-specified temperature profiles. The Heat
Exchanger also supplies DC power for the operation of the CMRV
thermoelectric modules.
Hook-weights
Air/Water Heat Exchanger
(see chapter 4 for Setup diagram)