2
CANNON
®
CT-1000 Constant Temperature Bath
Revision 3.1a—February, 1998;
CANNON
®
Instrument Company
P.O . Box 16 • State College, PA • USA
Temperature selection
Ten of the most commonly-used temperatures for kinematic viscosity
measurement can be set by using a switch on the bath front panel. The
bath will equilibrate within a fraction of one degree of the desired tem-
perature. A fine-tuning control permits further temperature adjustments.
By switching to the variable setting on the front panel, the operator can
set any temperature within the operating range of the instrument.
Bath description
The bath chamber is a cylindrical clear Pyrex
®
vessel 300 mm (12
inches) in diameter and 300 mm (12 inches) high. A stainless steel baffle
coated with white Teflon is located in the center of the bath and provides
a convenient backdrop for viewing viscometers placed in the bath. The
top cover contains seven round holes 51 mm (two inches) in diameter for
insertion of viscometer holders. Two additional holes are provided for
thermometers. Twin fluorescent lamps provide glare-free illumination of
the bath.
A solid-state control circuit equipped with a stainless steel-encased
thermistor provides proportional temperature control. A motor-driven
stirrer ensures that a uniform temperature is maintained throughout the
bath.
The bath housing is fabricated from heavy aluminum and coated with a
corrosion-resistant epoxy. The top cover consists of three layers; a
stainless steel top surface, an insulating layer, and a bottom stainless steel
heat reflector.
Temperature stability
The temperature control of ± 0.01°C below 100°C, and ± 0.03°C from
100 to 150°C, provides the sensitivity required by ASTM D 445 for
kinematic viscosity measurements. A built-in cooling coil, when connected
to tap water or a cooling system, permits operation below or slightly
above ambient temperature.
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