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General Operation
8.4 Stirring 8
8-7
Pour Point: This represents a handling limit for the fluid.
Viscosity: Points shown are at 50 and 10 centistokes viscosity. When viscosity
is greater than 50 centistokes stirring is very poor and the fluid is unsatisfactory
for bath applications. Optimum stirring generally occurs at 10 centistokes and
below.
Fume Point: A fume hood should be used. This point is very subjective in nature
and is impacted by individual tolerance to different fumes and smells, how well
the bath is covered, the surface area of the fluid in the bath, the size and
ventilation of the facility where the bath is located and other conditions. We
assume the bath is well covered at this point. This is also subject to company
policy.
Flash Point: The point at which ignition may occur. The point shown may be
either the open or closed cup flash point. Refer to the flash point discussion in
Section 8.3.8.
Boiling Point: At or near the boiling point of the fluid, the temperature stability is
difficult to maintain. Fuming or evaporation is excessive. Large amounts of heater
power may be required because of the heat of vaporization.
Decomposition: The temperature may reach a point at which decomposition of
the fluid begins. Further increasing the temperature may accelerate
decomposition to the point of danger or impracticality.
8.4 Stirring
Stirring of the bath fluid is very important for stable temperature control. The fluid
must be mixed well for good temperature uniformity and fast controller response.
The stirrer is adjusted for optimum performance. Table 4 on page 27 shows
nominal stirrer motor settings for several fluids.
If the stirrer does not function properly, the instrument will oscillate and not meet
published specifications.
Note:
If the bath is used with the probe basket removed, stir motor settings
need to be changed so that a small vortex can be seen in the liquid.
1.888.610.7664 sales@GlobalTestSupply.com
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