Table of Contents
Advertisement
8.1.11
Fluid Characteristics Charts
Table 2 and Figure 7 on pages 32 and 33 have been created to provide help in
selecting a heat exchange fluid media for your constant temperature bath. The
charts provide both a visual and numerical representation of most of the physi-
cal qualities important in making a selection. The list is not all inclusive, many
useable fluids may not have been shown in this listing.
8.1.11.1
Limitations and Disclaimer
Every effort has gone into making these charts accurate, however, the data here
does not imply any guarantee of fitness of use for a particular application.
Working near the limits of a property such as the flash point or viscosity limit
can compromise safety or performance. Sources of information sometimes vary
for particular properties. Your company's safety policies as well as personal
judgement regarding flash points, toxicity, etc. must also be considered. You
are responsible for reading the MSDS sheets and making a judgement here.
Cost may require some compromises as well. Hart Scientific cannot be liable
for the suitability of application or for any personal injury, damage to equip-
ment, product or facilities in using these fluids.
The charts include information on a variety of fluids which are often used as
heat transfer fluid in baths. Because of the temperature range, some fluids may
not apply to your bath.
8.1.11.2
About the Graph
The fluid graph visually illustrates some of the important qualities of the fluids
shown.
Temperature Range: The temperature scale is shown in degrees Celsius. A
sense of the fluid's general range of application is indicated. Qualities including
pour point, freeze point, important viscosity points, flash point, boiling point
and others may be shown.
Freezing Point: The freezing point of a fluid is an obvious limitation to stir-
ring. As the freezing point is approached high viscosity may also limit good
stirring.
Pour Point: The pour point represents a handling limit for the fluid.
Viscosity: Points shown are at 50 and 10 centistokes. Greater than 50 centi-
stokes stirring is very poor and unsatisfactory for bath applications. At 10
centistokes and below optimum stirring can occur. These are rules of thumb
which have been useful for most applications.
Fume Point: The point at which 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
others. The bath should be well covered at this point. This is also subject to
company policies and safety rules.
8 General Operation
Bath Heat Transfer Fluid
31
Advertisement
Table of Contents
