Cannon CT-2000, Руководство пользователя

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10
CANNON
® CT-2000 Constant Temperature Bath
Revision 1.0g—February, 2012;
CANNON
® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
Thermometer immersion
Proper thermometer immersion is critical for viscosity measurements.
Even a calibrated thermometer will read incorrectly if is it improperly
immersed in the bath. “Total immersion” kinematic viscosity thermom-
eters should be used with the bulb and only the mercury column beneath
the surface of the liquid, but with the emergent stem above the surface at
ambient temperatures.
Filling the bath
CAUTION
Make sure that the bath is placed in
its intended final position before
adding bath fluid. The CT-2000
should not be moved with bath fluid
in the bath jar. NEVER USE FLAM-
MABLE BATH LIQUIDS.
1. Make sure that the instrument
power is
OFF
and select a bath
liquid appropriate to your operat-
ing temperature range (see
APPENDIX C).
2. Fill the jar with bath liquid at ambient temperature to a level suffi-
cient to engage the float switch. This float permits bath operation
when the minimum amount of fluid has been added to the bath jar.
3. Continue to add fluid until the bath liquid level has risen to approxi-
mately 40 mm (1.5") of the top of the jar.
4. Turn the instrument power
ON
and incrementally heat the bath to
desired control temperature while monitoring the bath liquid level
carefully. The bath level must be 15-20 mm (approximately ½" to
¾") from the top of the jar at the control temperature. If it becomes
apparent that this liquid level will not be achieved, return the bath to
within 10°C of ambient, turn the instrument power
OFF
and add or
remove liquid as necessary.
5. Repeat step four until you have attained the proper bath liquid level
at the desired control temperature.
CAUTION
Different bath fluids expand at different rates. Do not overfill the bath!
WARNING
Monitor the level of bath liquid closely when operating the CT-2000 at
higher temperatures (100-150°C). The bath liquid will expand as the
temperature increases. The CT-2000 bath jar is not designed to contain
liquid under pressure. If the bath is overfilled, liquid may overflow.
Figure 11: Filling the bath